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181 results on '"W. de Clercq"'

1. Distributive rainfall–runoff modelling to understand runoff-to-baseflow proportioning and its impact on the determination of reserve requirements of the Verlorenvlei estuarine lake, west coast, South Africa

Author

A. Watson, J. Miller, M. Fink, S. Kralisch, M. Fleischer, and W. de Clercq

Subjects
Technology, Environmental technology. Sanitary engineering, TD1-1066, Geography. Anthropology. Recreation, Environmental sciences, GE1-350
Abstract

River systems that support high biodiversity profiles are conservation priorities worldwide. Understanding river ecosystem thresholds to low-flow conditions is important for the conservation of these systems. While climatic variations are likely to impact the streamflow variability of many river courses into the future, understanding specific river flow dynamics with regard to streamflow variability and aquifer baseflow contributions is central to the implementation of protection strategies. While streamflow is a measurable quantity, baseflow has to be estimated or calculated through the incorporation of hydrogeological variables. In this study, the groundwater components within the J2000 rainfall–runoff model were distributed to provide daily baseflow and streamflow estimates needed for reserve determination. The modelling approach was applied to the RAMSAR-listed Verlorenvlei estuarine lake system on the west coast of South Africa, which is under threat due to agricultural expansion and climatic fluctuations. The sub-catchment consists of four main tributaries, Krom Antonies, Hol, Bergvallei and Kruismans. Of these, Krom Antonies was initially presumed the largest baseflow contributor, but was shown to have significant streamflow variability attributed to the highly conductive nature of the Table Mountain Group sandstones and Quaternary sediments. Instead, Bergvallei was identified as the major contributor of baseflow. Hol was the least susceptible to streamflow fluctuations due to the higher baseflow proportion (56 %) as well as the dominance of less conductive Malmesbury shales that underlie it. The estimated flow exceedance probabilities indicated that during the 2008–2017 wet cycle average lake inflows exceeded the average evaporation demand, although yearly rainfall is twice as variable in comparison to the first wet cycle between 1987 and 1996. During the 1997–2007 dry cycle, average lake inflows are exceeded 85 % of the time by the evaporation demand. The exceedance probabilities estimated here suggest that inflows from the four main tributaries are not enough to support Verlorenvlei, with the evaporation demand of the entire lake being met only 35 % of the time. This highlights the importance of low-occurrence events for filling up Verlorenvlei, allowing for regeneration of lake-supported ecosystems. As climate change drives increased temperatures and rainfall variability, the length of dry cycles is likely to increase into the future and result in the lake drying up more frequently. For this reason, it is important to ensure that water resources are not over-allocated during wet cycles, hindering ecosystem regeneration and prolonging the length of these dry cycle conditions.

Published
2019
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2. The SASSCAL contribution to climate observation, climate data management and data rescue in Southern Africa

Author

F. Kaspar, J. Helmschrot, A. Mhanda, M. Butale, W. de Clercq, J. K. Kanyanga, F. O. S. Neto, S. Kruger, M. Castro Matsheka, G. Muche, T. Hillmann, K. Josenhans, R. Posada, J. Riede, M. Seely, C. Ribeiro, P. Kenabatho, R. Vogt, and N. Jürgens

Subjects
Science, Physics, QC1-999, Meteorology. Climatology, QC851-999
Abstract

A major task of the newly established "Southern African Science Service Centre for Climate Change and Adaptive Land Management" (SASSCAL; www.sasscal.org) and its partners is to provide science-based environmental information and knowledge which includes the provision of consistent and reliable climate data for Southern Africa. Hence, SASSCAL, in close cooperation with the national weather authorities of Angola, Botswana, Germany and Zambia as well as partner institutions in Namibia and South Africa, supports the extension of the regional meteorological observation network and the improvement of the climate archives at national level. With the ongoing rehabilitation of existing weather stations and the new installation of fully automated weather stations (AWS), altogether 105 AWS currently provide a set of climate variables at 15, 30 and 60 min intervals respectively. These records are made available through the SASSCAL WeatherNet, an online platform providing near-real time data as well as various statistics and graphics, all in open access. This effort is complemented by the harmonization and improvement of climate data management concepts at the national weather authorities, capacity building activities and an extension of the data bases with historical climate data which are still available from different sources. These activities are performed through cooperation between regional and German institutions and will provide important information for climate service related activities.

Published
2015
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4. Gallo-Roman whetstone building deposits. The cultural biography of the domestic sphere in northern Gaul

Author

Sibrecht Reniere and W. De Clercq

Subjects
Archeology, History, 060101 anthropology, 060102 archaeology, biology, Human Factors and Ergonomics, Biography, Structural component, 06 humanities and the arts, biology.organism_classification, Archaeology, Domestic environment, Belgica, 0601 history and archaeology, Whetstone
Abstract

We discuss the ritual deposition of whetstones on native-type farmsteads in the northern-most parts of the Gallo-Roman Province of Gallia Belgica. The phenomenon occurs mainly in the lower river Scheldt valley (Belgian East and West Flanders and the southwestern Netherlands), where these whetstones, as well as other objects, are most often found in the domestic environment of timber-framed stable-houses. We show that the stone tools were buried deliberately in a specific structural component of the house, and that there was no intention of reclaiming them afterwards. By burying these whetstones, native Gallo-Roman-period farmers removed them from their primary, functional use, but at the same time initiated a new trajectory in their cultural biography. They received a ritual, apotropaic function in the course of the domestic life cycle of the house and its inhabitants, connected to the seasonal rhythm of the annual harvest cycle. This paper aims to contribute to the discussion of structured (building) deposits in archaeology and, more generally speaking, to the various aspects of the cultural biography of houses.

Published
2018
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5. Bypassing the Suess-effect: Age determination of charcoal kiln remains using OSL dating

Author

N. Karimi Moayed, Ann-Eline Debeer, J. De Grave, W. De Clercq, Koen Deforce, Elke Ghyselbrecht, P. De Smedt, Dimitri Vandenberghe, and Jan Bastiaens

Subjects
010506 paleontology, Archeology, 060102 archaeology, Optically stimulated luminescence, Kiln, Time resolution, 06 humanities and the arts, 01 natural sciences, law.invention, Suess effect, law, visual_art, visual_art.visual_art_medium, Environmental science, 0601 history and archaeology, Radiocarbon dating, Physical geography, Charcoal, Optical dating, 0105 earth and related environmental sciences, Chronology
Abstract

Ancient forests all over Europe often preserve remains of (pre)historic charcoal production (kilns), informing on past forest composition and anthropogenic woodland exploitation. So far, the chronology of these features has been entirely derived from 14C-dating of associated charcoal. Though generally successful, 14C-dating cannot provide meaningful age information for post-1650 CE features, while most of the archaeological remains of charcoal kilns date to this period. Here, we investigate the potential of quartz-based optically stimulated luminescence (OSL) dating of sediments that were heated during charcoal production as a more precise alternative tool for age determination of these kilns. Using a set of 14 samples collected from both relict charcoal kilns and the underlying parent material, we first document the quartz OSL characteristics in terms of the procedural tests commonly used to assess the appropriateness of the single-aliquot regenerative-dose (SAR) protocol. The results suggest that the measurement procedure allows determining equivalent doses both accurately and precisely. We then demonstrate how the linear part of the dose-response curve can be exploited to examine completeness of resetting and/or post-depositional disturbance without compromising instrument time, precision and laboratory accuracy. Optical ages derived from these distributions are consistent with the available independent (14C) age information for the charcoal kilns. We conclude that OSL can provide an accurate and viable alternative to 14C and will be especially useful to constrain post-1650 CE features in time. Our results also suggest that the approach may allow establishing relative chronologies with a time resolution of 2–4%.

Published
2020
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6. High Y-chromosomal diversity and low relatedness between paternal lineages on a communal scale in the Western European Low Countries during the surname establishment

Author

K. Matthys, W. De Clercq, A. Van Geystelen, Maarten Larmuseau, Hendrik F M Larmuseau, Ronny Decorte, Nancy Vanderheyden, and Nele Boon

Subjects
Genotype, media_common.quotation_subject, Biodiversity, Biology, Indigenous, Belgium, Human population genetics, Genetics, Humans, Names, Genetics (clinical), Selection (genetic algorithm), History, 15th Century, media_common, Genetic diversity, Chromosomes, Human, Y, Genetic Variation, Sequence Analysis, DNA, History, Medieval, Genealogy, language.human_language, Pedigree, Europe, Flemish, Genetics, Population, Genetic distance, language, Original Article, Diversity (politics)
Abstract

There is limited knowledge on the biological relatedness between citizens and on the demographical dynamics within villages, towns and cities in pre-17th century Western Europe. By combining Y-chromosomal genotypes, in-depth genealogies and surname data in a strict genetic genealogical approach, it is possible to provide insights into the genetic diversity and the relatedness between indigenous paternal lineages within a particular community at the time of the surname adoption. To obtain these insights, six Flemish communities were selected in this study based on the differences in geography and historical development. After rigorous selection of appropriate DNA donors, low relatedness between Y chromosomes of different surnames was found within each community, although there is co-occurrence of these surnames in each community since the start of the surname adoption between the 14th and 15th century. Next, the high communal diversity in Y-chromosomal lineages was comparable with the regional diversity across Flanders at that time. Moreover, clinal distributions of particular Y-chromosomal lineages between the communities were observed according to the clinal distributions earlier observed across the Flemish regions and Western Europe. No significant indication for genetic differences between communities with distinct historical development was found in the analysis. These genetic results provide relevant information for studies in historical sciences, archaeology, forensic genetics and genealogy.

Published
2015
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7. Composition and state of alteration of 18th-century glass finds found at the Cistercian nunnery of Clairefontaine, Belgium

Author

Kevin Hellemans, Koen Janssens, Davy Herremans, Anke Vincke, Simone Cagno, and W. De Clercq

Subjects
History, Archeology, Glass production, business.industry, Physics, Potash, Trace element, Mineralogy, Composition (combinatorics), engineering.material, Philosophy, La icp ms, Group (periodic table), engineering, Multivariate statistical, business, Geology, Lime
Abstract

A hundred 18th-century glass fragments were recovered at the Clairefontaine monastery in the Belgian province of Luxembourg. They were analysed by a combination of SEM-EDX and LA-ICP-MS in order to determine their major composition as well as their trace element signature. Multivariate statistical methods such as hierarchical clustering and principal component analysis were used to divide the glass fragments into four main groups: potassium-rich glass, sodium-rich glass, potassium/lime-rich glass and high-lime-low-alkali glass. Within every group, not only a similarity in composition is observed, but also in colour, morphology and deterioration patterns. Potash glass fragments are the most abundant and show extensive deterioration; two classes of potash glass were identified: one similar to certain Central European glass compositions, while the other one, characterised by large variations in potash: lime ratio, may be attributed to local (regional) glass production. (C) 2014 Elsevier Ltd. All rights reserved.

Published
2014
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8. A combined spectroscopic study on Chinese porcelain containing ruan-cai colours

Author

Bart Vekemans, E. Verhaeven, Peter Vandenabeele, Luc Moens, J. Van Pevenage, Laszlo Vincze, Debbie Lauwers, Davy Herremans, and W. De Clercq

Subjects
Materials science, Opacity, General Chemical Engineering, General Engineering, chemistry.chemical_element, Mineralogy, Malachite, Analytical Chemistry, symbols.namesake, Palette (painting), chemistry, visual_art, symbols, visual_art.visual_art_medium, Micro spectroscopy, Raman spectroscopy, Tin, Spectroscopy, Solid solution
Abstract

Because of its major contributions to the world economy and cultural heritage, Chinese porcelain and its technology can be considered as very important. In this research, the applicability of Raman spectroscopy and X-Ray Fluorescence (XRF) spectroscopy to study the pigments of the ruan-cai colour palette of Chinese porcelain dating from the 18th century was evaluated. Next to the investigations based on stylistic analysis, the use of other analysis techniques is important to obtain complementary information. Raman spectroscopy and XRF spectroscopy are two non-invasive, analytical techniques proven to be useful for the determination of the nature and composition of pigments used to decorate ceramics. As a result, analytical analysis allows us to retrieve more information about the production of Chinese porcelain. Based on visual inspection of the decoration, the objects could be divided into two groups and to evaluate the use of the combined analytical approach, all groups and subgroups were sampled. Before Raman and XRF analyses, the samples were cut, embedded and polished, in order to be able to measure the transversal section of the samples. In this way, each layer of the porcelain samples could be analysed separately. The results show that the blue colour is cobalt-aluminium oxide, in red zones haematite (α-Fe2O3) is present and the green area contains a mixture of CuO in a lead-rich basis and a solid solution of malachite (Cu2CO3(OH)2). The opaque yellow and white colours were identified as lead tin yellow type II (PbSn1−xSixO3, where x ∼ 0.25) and a lead arsenate, respectively.

Published
2014
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11. Towards an Integrated Methodology for Assessing Rural Settlement Landscapes in the Belgian Lowlands

Author

P. De Smedt, Peter Masters, M. Van Meirvenne, B. Stichelbaut, J. De Reu, W. De Clercq, Timothy Saey, and Davy Herremans

Subjects
Archeology, History, Rural landscapes, Prospection, Aerial photography, business.industry, Environmental resource management, Integrated approach, business, Rural settlement, Settlement (litigation), Archaeology, Geology
Abstract

Although the Belgian lowlands witnessed a dense rural occupation in Roman and especially in medieval times, the exact nature of the settlement patterns, the farms and the interaction with the landscape is still poorly understood archaeologically, both scientifically and from a heritage curatorship point of view. Archaeogeophysical research has remained relatively limited in this area. However, other prospection techniques such as aerial photography provide ample evidence of historic rural settlement. The main aim of this research is to develop an efficient and integrated approach for the characterization of these rural landscapes, by combining and mutually evaluating data from geophysical methods including magnetometer, electromagnetic induction and ground-penetrating radar, aerial photography, fieldwalking, historic accounts and test-pitting. Copyright © 2012 John Wiley & Sons, Ltd.

Published
2012
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12. Modeling common dynamics in multichannel signals with applications to artifact and background removal in EEG recordings

Author

W. Van Paesschen, W. De Clercq, Bart Vanrumste, S. Van Huffel, and Jean-Michel Papy

Subjects
Computer science, Speech recognition, Models, Neurological, Biomedical Engineering, Action Potentials, Electroencephalography, Epilepsy, medicine, Humans, Computer Simulation, Ictal, Diagnosis, Computer-Assisted, Muscle, Skeletal, Artifact (error), medicine.diagnostic_test, Noise (signal processing), Brain, Signal Processing, Computer-Assisted, medicine.disease, Dynamics (music), Principal component analysis, Artifacts, Algorithms, Subspace topology
Abstract

Removing artifacts and background electroencephalography (EEG) from multichannel interictal and ictal EEG has become a major research topic in EEG signal processing in recent years. We applied for this purpose a recently developed subspace-based method for modeling the common dynamics in multichannel signals. When the epileptiform activity is common in the majority of channels and the artifacts appear only in a few channels the proposed method can be used to remove the latter. The performance of the method was tested on simulated data for different noise levels. For high noise levels the method was still able to identify the common dynamics. In addition, the method was applied to real life EEG recordings containing interictal and ictal activity contaminated with muscle artifact. The muscle artifacts were removed successfully. For both the synthetic data and the analyzed real life data the results were compared with the results obtained with principal component analysis (PCA). In both cases, the proposed method performed better than PCA.

Published
2005
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13. Illustration of compositional variations over time of Chinese porcelain glazes combining micro-X-ray fluorescence spectrometry, multivariate data analysis and Seger formulas

Author

Davy Herremans, Bart Vekemans, J. Van Pevenage, Peter Vandenabeele, Debbie Lauwers, Luc Moens, Laszlo Vincze, E. Verhaeven, and W. De Clercq

Subjects
Chemistry, Glaze, Nondestructive analysis, Micro-X-ray fluorescence, Mineralogy, X-ray fluorescence, Statistical analysis, Mass spectrometry, Instrumentation, Spectroscopy, Atomic and Molecular Physics, and Optics, Analytical Chemistry
Abstract

In this research, the transparent glaze layers of Chinese porcelain samples were investigated. Depending on the production period, these samples can be divided into two groups: the samples of group A dating from the Kangxi period (1661-1722), and the samples of group B produced under emperor Qianlong (1735-1795). Due to the specific sample preparation method and the small spot size of the X-ray beam, investigation of the transparent glaze layers is enabled. Despite the many existing research papers about glaze investigations of ceramics and/or porcelain ware, this research reveals new insights into the glaze composition and structure of Chinese porcelain samples. In this paper it is demonstrated, using micro-X-ray Fluorescence (mu-XRF) spectrometry, multivariate data analysis and statistical analysis (Hotelling's T-Square test) that the transparent glaze layers of the samples of groups A and B are significantly different (95% confidence level). Calculation of the Seger formulas, enabled classification of the glazes. Combining all the information, the difference in composition of the Chinese porcelain glazes of the Kangxi period and the Qianlong period can be demonstrated. (C) 2014 Elsevier B.V. All rights reserved.

Published
2015

14. Measurement of the electron structure function F2e at LEP energies

Author

Abdallah, J. Abreu, P. Adam, W. Adzic, P. Albrecht, T. Alemany-Fernandez, R. Allmendinger, T. Allport, P.P. Amaldi, U. Amapane, N. Amato, S. Anashkin, E. A.Andreazza Andringa, S. Anjos, N. Antilogus, P. Apel, W.-D. Arnoud, Y. Ask, S. Asman, B. Augustin, J.E. Augustinus, A. Baillon, P. Ballestrero, A. Bambade, P. Barbier, R. Bardin, D. Barker, G.J. Baroncelli, A. Battaglia, M. Baubillier, M. Becks, K.-H. Begalli, M. Behrmann, A. Belous, K. Ben-Haim, E. Benekos, N. Benvenuti, A. Berat, C. Berggren, M. Bertrand, D. Besancon, M. Besson, N. Bloch, D. Blom, M. Bluj, M. Bonesini, M. Boonekamp, M. Booth, P.S.L. Borisov, G. Botner, O. Bouquet, B. Bowcock, T.J.V. Boyko, I. Bracko, M. Brenner, R. Brodet, E. Bruckman, P. Brunet, J.M. Buschbeck, B. Buschmann, P. Calvi, M. Camporesi, T. Canale, V. Carena, F. Castro, N. Cavallo, F. Chapkin, M. Charpentier, P.H. Checchia, P. Chierici, R. Chliapnikov, P. Chudoba, J. Chung, S.U. Cieslik, K. Collins, P. Contri, R. Cosme, G. Cossutti, F. Costa, M.J. Crennell, D. Cuevas, J. D'Hondt, J. da Silva, T. Da Silva, W. Della Ricca, G. De Angelis, A. De Boer, W. De Clercq, C. De Lotto, B. De Maria, N. DeMin, A. de Paula, L. Di Ciaccio, L. Di Simone, A. Doroba, K. Drees, J. Eigen, G. Ekelof, T. Ellert, M. Elsing, M. Espirito Santo, M.C. Fanourakis, G. Fassouliotism, D. Feindt, M. Fernandez, J. Ferrer, A. Ferro, F. Flagmeyer, U. Foeth, H. Fokitis, E. Fulda-Quenzer, F. Fuster, J. Gandelman, M. Garcia, C. Gavillet, P.H. Gazis, E. Gokieli, R. Golob, B. Gomez-Ceballos, G. Gonçalves, P. Graziani, E. Grosdidier, G. Grzelak, K. Guy, J. Haag, C. Hallgren, A. Hamacher, K. Hamilton, K. Haug, S. Hauler, F. Hedberg, V. Hennecke, M. Hoffman, J. Holmgren, S.-O. Holt, P.J. Houlden, M.A. Jackson, J.N. Jarlskog, G. Jarry, P. Jeans, D. Johansson, E.K. Jonsson, P. Joram, C. Jungermann, L. Kapusta, F. Katsanevas, S. Katsoufis, E. Kernel, G. Kersevan, B.P. Kerzel, U. King, B.T. Kjaer, N.J. Kluit, P. Kokkinias, P. Kourkoumelis, C. Kouznetsov, O. Krumstein, Z. Kucharczyk, M. Lamsa, J. Leder, G. Ledroit, F. Leinonen, L. Leitner, R. Lemonne, J. Lepeltier, V. Lesiak, T. Liebig, W. Liko, D. Lipniacka, A. Lopes, J.H. Lopez, J.M. Loukas, D. Lutz, P. Lyons, L. MacNaughton, J. Malek, A. Maltezos, S. Mandl, F. Marco, J. Marco, R. Marechal, B. Margoni, M. Marin, J.-C. Mariotti, C. Markou, A. Martinez-Rivero, C. Masik, J. Mastroyiannopoulos, N. Matorras, F. Matteuzzi, C. Mazzucato, F. Mazzucato, M. McNulty, R. Meroni, C. Migliore, E. Mitaroff, W. Mjoernmark, U. Moa, T. Moch, M. Moenig, K. Monge, R. Montenegro, J. Moraes, D. Moreno, S. Morettini, P. Mueller, U. Muenich, K. Mulders, M. Mundim, L. Murray, W. Muryn, B. Myatt, G. Myklebust, T. Nassiakou, M. Navarria, F. Nawrocki, K. Nemecek, S. Nicolaidou, R. Nikolenko, M. Oblakowska-Mucha, A. Obraztsov, V. Olshevski, A. Onofre, A. Orava, R. Osterberg, K. Ouraou, A. Oyanguren, A. Paganoni, M. Paiano, S. J.P.Palacios Palka, H. Th.Papadopoulou, D. Pape, L. Parkes, C. Parodi, F. Parzefall, U. A.Passeri Passon, O. Peralta, L. Perepelitsa, V. Perrotta, A. Petrolini, A. Piedra, J. Pieri, L. Pierre, F. Pimenta, M. Piotto, E. Podobnik, T. Poireau, V. Pol, M.E. Polok, G. Pozdniakov, V. Pukhaeva, N. Pullia, A. Radojicic, D. Rebecchi, P. Rehn, J. Reid, D. Reinhardt, R. Renton, P. Richard, F. Ridky, J. Rivero, M. Rodriguez, D. Romero, A. Ronchese, P. Roudeau, P. Rovelli, T. Ruhlmann, V.-Kleider Ryabtchikov, D. Sadovsky, A. Salmi, L. Salt, J. Sander, C. Savoy, A.-Navarro Schwickerath, U. Sekulin, R. Siebel, M. Sisakian, A. Slominski, W. Smadja, G. Smirnova, O. Sokolov, A. Sopczak, A. Sosnowski, R. Spassov, T. Stanitzki, M. Stocchi, A. Strauss, J. Stugu, B. Szczekowski, M. Szeptycka, M. Szumlak, T. Szwed, J. Tabarelli, T. Tegenfeldt, F. Timmermans, J. Tkatchev, L. Tobin, M. Todorovova, S. Tomé, B. Tonazzo, A. Tortosa, P. Travnicek, P. Treille, D. Tristram, G. Trochimczuk, M. Troncon, C. Turluer, M.-L. Tyapkin, I.A. Tyapkin, P. Tzamarias, S. Uvarov, V. Valenti, G. VanDam, P. VanEldik, J. van Remortel, N. Van Vulpen, I. Vegni, G. Veloso, F. Venus, W. Verdier, P. Verzi, V. Vilanova, D. Vitale, L. Vrba, V. Wahlen, H. Washbrook, A.J. Weiser, C. Wicke, D. Wickens, J. Wilkinson, G. Winter, M. Witek, M. Yushchenko, O. Zalewska, A. Zalewski, P. Zavrtanik, D. Zhuravlov, V. Zimin, N.I. Zintchenko, A. Zupan, M.

Subjects
High Energy Physics::Experiment
Abstract

The hadronic part of the electron structure function F2e has been measured for the first time, using e +e - data collected by the DELPHI experiment at LEP, at centre-of-mass energies of s=91.2-209.5GeV. The data analysis is simpler than that of the measurement of the photon structure function. The electron structure function F2e data are compared to predictions of phenomenological models based on the photon structure function. It is shown that the contribution of large target photon virtualities is significant. The data presented can serve as a cross-check of the photon structure function F2γ analyses and help in refining existing parameterisations. © 2014 The Authors. Elsevier B.V.

Published
2014

15. Electroweak measurements in electron-positron collisions at W-boson-pair energies at LEP

Author

Schael, S. Barate, R. Brunelière, R. Buskulic, D. De Bonis, I. Decamp, D. Ghez, P. Goy, C. Jézéquel, S. Lees, J.-P. Lucotte, A. Martin, F. Merle, E. Minard, M.-N. Nief, J.-Y. Odier, P. Pietrzyk, B. Trocmé, B. Bravo, S. Casado, M.P. Chmeissani, M. Comas, P. Crespo, J.M. Fernandez, E. Fernandez-Bosman, M. Garrido, L. Grauges, E. Juste, A. Martinez, M. Merino, G. Miquel, R. Mir, L.M. Orteu, S. Pacheco, A. Park, I.C. Perlas, J. Riu, I. Ruiz, H. Sanchez, F. Colaleo, A. Creanza, D. De Filippis, N. de Palma, M. Iaselli, G. Maggi, G. Maggi, M. Nuzzo, S. Ranieri, A. Raso, G. Ruggieri, F. Selvaggi, G. Silvestris, L. Tempesta, P. Tricomi, A. Zito, G. Huang, X. Lin, J. Ouyang, Q. Wang, T. Xie, Y. Xu, R. Xue, S. Zhang, J. Zhang, L. Zhao, W. Abbaneo, D. Bazarko, A. Becker, U. Boix, G. Bird, F. Blucher, E. Bonvicini, B. Bright-Thomas, P. Barklow, T. Buchmüller, O. Cattaneo, M. Cerutti, F. Ciulli, V. Clerbaux, B. Drevermann, H. Forty, R.W. Frank, M. Greening, T.C. Hagelberg, R. Halley, A.W. Gianotti, F. Girone, M. Hansen, J.B. Harvey, J. Jacobsen, R. Hutchcroft, D.E. Janot, P. Jost, B. Knobloch, J. Kado, M. Lehraus, I. Lazeyras, P. Maley, P. Mato, P. May, J. Moutoussi, A. Pepe-Altarelli, M. Ranjard, F. Rolandi, L. Schlatter, D. Schmitt, B. Schneider, O. Tejessy, W. Teubert, F. Tomalin, I.R. Tournefier, E. Veenhof, R. Valassi, A. Wiedenmann, W. Wright, A.E. Ajaltouni, Z. Badaud, F. Chazelle, G. Deschamps, O. Dessagne, S. Falvard, A. Ferdi, C. Fayolle, D. Gay, P. Guicheney, C. Henrard, P. Jousset, J. Michel, B. Monteil, S. Montret, J.C. Pallin, D. Pascolo, J.M. Perret, P. Podlyski, F. Bertelsen, H. Fernley, T. Hansen, J.D. Hansen, J.R. Hansen, P.H. Kraan, A.C. Lindahl, A. Mollerud, R. Nilsson, B.S. Rensch, B. Waananen, A. Daskalakis, G. Kyriakis, A. Markou, C. Simopoulou, E. Siotis, I. Vayaki, A. Zachariadou, K. Blondel, A. Bonneaud, G. Brient, J.-C. Machefert, F. Rougé, A. Rumpf, M. Swynghedauw, M. Tanaka, R. Verderi, M. Videau, H. Focardi, E. Parrini, G. Corden, M. 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Berlich, P. Bethke, S. Biebel, O. Boeriu, O. Blobel, V. Bloodworth, I.J. Bloomer, J.E. Bobinski, M. Bock, P. Bonacorsi, D. Bosch, H.M. Boutemeur, M. Bouwens, B.T. Braibant, S. Brigliadori, L. Brown, R.M. Burckhart, H.J. Burgard, C. Bürgin, R. Cammin, J. Campana, S. Capiluppi, P. Carnegie, R.K. Carter, A.A. Carter, J.R. Chang, C.Y. Charlton, D.G. Chrisman, D. Ciocca, C. Clarke, P.E.L. Clay, E. Cohen, I. Conboy, J.E. Cooke, O.C. Couchman, J. Couyoumtzelis, C. Coxe, R.L. Csilling, A. Cuffiani, M. Dado, S. Dallapiccola, C. Dallavalle, M. Dallison, S. De Jong, S. De Roeck, A. Dervan, P. De Wolf, E.A. del Pozo, L.A. Desch, K. Dienes, B. Dixit, M.S. do Couto e Silva, E. Donkers, M. Doucet, M. Dubbert, J. Duchovni, E. Duckeck, G. Duerdoth, I.P. Edwards, J.E.G. Estabrooks, P.G. Etzion, E. Evans, H.G. Evans, M. Fabbri, F. Fanti, M. Fath, P. Feld, L. Ferrari, P. Fiedler, F. Fierro, M. Fischer, H.M. Fleck, I. Folman, R. Fong, D.G. Ford, M. Foucher, M. Frey, A. Fürtjes, A. Futyan, D.I. Gagnon, P. Gary, J.W. Gascon, J. Gascon-Shotkin, S.M. Gaycken, G. Geddes, N.I. Geich-Gimbel, C. Geralis, T. Giacomelli, G. Giacomelli, P. Giacomelli, R. Gibson, V. Gibson, W.R. Gingrich, D.M. Giunta, M. Glenzinski, D. Goldberg, J. Goodrick, M.J. Gorn, W. Graham, K. Grandi, C. Gross, E. Grunhaus, J. Gruwé, M. Günther, P.O. Gupta, A. Hajdu, C. Hamann, M. Hanson, G.G. Hansroul, M. Hapke, M. Harder, K. Harel, A. Hargrove, C.K. Harin-Dirac, M. Hart, P.A. Hartmann, C. Hauke, A. Hauschild, M. Hawkes, C.M. Hawkings, R. Hemingway, R.J. Hensel, C. Herndon, M. Herten, G. Heuer, R.D. Hildreth, M.D. Hill, J.C. Hillier, S.J. Hilse, T. Hobson, P.R. Hocker, A. Hoffman, K. Homer, R.J. Honma, A.K. Horváth, D. Hossain, K.R. Howard, R. Hughes-Jones, R.E. Hüntemeyer, P. Igo-Kemenes, P. Imrie, D.C. Ingram, M.R. Ishii, K. Jacob, F.R. Jawahery, A. Jeffreys, P.W. Jeremie, H. Jimack, M. Joly, A. Jones, C.R. Jones, G. Jones, M. Jost, U. Jovanovic, P. Junk, T.R. Kanaya, N. Kanzaki, J. Karapetian, G. Karlen, D. Kartvelishvili, V. Kawagoe, K. Kawamoto, T. Keeler, R.K. Kellogg, R.G. Kennedy, B.W. Kim, D.H. King, B.J. Kirk, J. Klein, K. Klier, A. Kluth, S. Kobayashi, T. Kobel, M. Koetke, D.S. Kokott, T.P. Kolrep, M. Komamiya, S. Kowalewski, R.V. Krämer, T. Krasznahorkay, A. Kress, T. Krieger, P. von Krogh, J. Kuhl, T. Kupper, M. Kyberd, P. Lafferty, G.D. Lahmann, R. Lai, W.P. Landsman, H. Lanske, D. Lauber, J. Lautenschlager, S.R. Lawson, I. Layter, J.G. Lazic, D. Lee, A.M. Lefebvre, E. Leins, A. Lellouch, D. Letts, J. Levinson, L. Lewis, C. Liebisch, R. Lillich, J. List, B. List, J. Littlewood, C. Lloyd, A.W. Lloyd, S.L. Loebinger, F.K. Long, G.D. Losty, M.J. Lu, J. Ludwig, A. Ludwig, J. Macchiolo, A. Macpherson, A. Mader, W. Mannelli, M. Marcellini, S. Marchant, T.E. Markus, C. Martin, A.J. Martinez, G. Mashimo, T. Matthews, W. Mättig, P. McDonald, W.J. McKenna, J. Mckigney, E.A. McMahon, T.J. McNab, A.I. McPherson, R.A. Mendez-Lorenzo, P. Meijers, F. Menges, W. Menke, S. Merritt, F.S. Mes, H. Meyer, N. Meyer, J. Michelini, A. Mihara, S. Mikenberg, G. Miller, D.J. Mir, R. Mohr, W. Montanari, A. Mori, T. Morii, M. Müller, U. Mutter, A. Nagai, K. Nakamura, I. Nanjo, H. Neal, H.A. Nellen, B. Nijjhar, B. Nisius, R. O'Neale, S.W. Oakham, F.G. Odorici, F. Ogren, H.O. Oh, A. Okpara, A. Oldershaw, N.J. Omori, T. Oreglia, M.J. Orito, S. Pahl, C. Pálinkás, J. Pásztor, G. Pater, J.R. Patrick, G.N. Patt, J. Pearce, M.J. Petzold, S. Pfeifenschneider, P. Pilcher, J.E. Pinfold, J. Plane, D.E. Poffenberger, P. Polok, J. Poli, B. Pooth, O. Posthaus, A. Przybycien, M. Przysiezniak, H. Quadt, A. Rabbertz, K. Rees, D.L. Rembser, C. Renkel, P. Rick, H. Rigby, D. Robertson, S. Robins, S.A. Rodning, N. Roney, J.M. Rooke, A. Ros, E. Rosati, S. Roscoe, K. Rossi, A.M. Rosvick, M. Routenburg, P. Rozen, Y. Runge, K. Runolfsson, O. Ruppel, U. Rust, D.R. Rylko, R. Sachs, K. Saeki, T. Sahr, O. Sarkisyan, E.K.G. Sasaki, M. Sbarra, C. Schaile, A.D. Schaile, O. Scharff-Hansen, P. Schenk, P. Schieck, J. Schmitt, S. Schörner-Sadenius, T. Schröder, M. Schultz-Coulon, H.C. Schulz, M. Schumacher, M. Schütz, P. Schwick, C. Scott, W.G. Seuster, R. Shears, T.G. Shen, B.C. Shepherd-Themistocleous, C.H. Sherwood, P. Siroli, G.P. Sittler, A. Skillman, A. Skuja, A. Smith, A.M. Smith, T.J. Snow, G.A. Sobie, R. Söldner-Rembold, S. Spagnolo, S. Spano, F. Springer, R.W. Sproston, M. Stahl, A. Steiert, M. Stephens, K. Steuerer, J. Stockhausen, B. Stoll, K. Strom, D. Ströhmer, R. Strumia, F. Stumpf, L. Surrow, B. Szymanski, P. Tafirout, R. Talbot, S.D. Tanaka, S. Taras, P. Tarem, S. Taylor, R.J. Tasevsky, M. Teuscher, R. Thiergen, M. Thomson, M.A. von Törne, E. Torrence, E. Towers, S. Toya, D. Trefzger, T. Trigger, I. Trócsányi, Z. Tsukamoto, T. Tsur, E. Turcot, A.S. Turner-Watson, M.F. Ueda, I. Ujvári, B. Utzat, P. Vachon, B. Van Kooten, R. Vannerem, P. Vértesi, R. Verzocchi, M. Vikas, P. Vincter, M. Vokurka, E.H. Vollmer, C.F. Voss, H. Vossebeld, J. Wäckerle, F. Wagner, A. Waller, D. Ward, C.P. Ward, D.R. Watkins, P.M. Watson, A.T. Watson, N.K. Wells, P.S. Wengler, T. Wermes, N. Wetterling, D. White, J.S. Wilkens, B. Wilson, G.W. Wilson, J.A. Wotton, S. Wyatt, T.R. Yamashita, S. Yekutieli, G. Zacek, V. Zer-Zion, D. Zivkovic, L.

Subjects
High Energy Physics::Experiment
Abstract

Electroweak measurements performed with data taken at the electron-positron collider LEP at CERN from 1995 to 2000 are reported. The combined data set considered in this report corresponds to a total luminosity of about 3fb-1 collected by the four LEP experiments ALEPH, DELPHI, L3 and OPAL, at centre-of-mass energies ranging from 130GeV to 209GeV. Combining the published results of the four LEP experiments, the measurements include total and differential cross-sections in photon-pair, fermion-pair and four-fermion production, the latter resulting from both double-resonant W W and Z Z production as well as singly resonant production. Total and differential cross-sections are measured precisely, providing a stringent test of the Standard Model at centre-of-mass energies never explored before in electron-positron collisions. Final-state interaction effects in four-fermion production, such as those arising from colour reconnection and Bose-Einstein correlations between the two W decay systems arising in W W production, are searched for and upper limits on the strength of possible effects are obtained. The data are used to determine fundamental properties of the W boson and the electroweak theory. Among others, the mass and width of the W boson, mW and ΓW, the branching fraction of W decays to hadrons, B (W → had), and the trilinear gauge-boson self-couplings g1 Z, κγ and λγ are determined to be: mW=80.376±0.033GeV ΓW=2.195±0.083GeV B(W→had)=67.41±0.27% g1 Z=0.9840+0.018 -0.020 κγ=0.982±0.042λγ=-0.022±0.019. © 2013 Elsevier B.V.

Published
2013

16. A study of the b-quark fragmentation function with the DELPHI detector at LEP I and an averaged distribution obtained at the Z Pole

Author

Abdallah, J. Abreu, P. Adam, W. Adzic, P. Albrecht, T. Alemany-Fernandez, R. Allmendinger, T. Allport, P.P. Amaldi, U. Amapane, N. Amato, S. Anashkin, E. Andreazza, A. Andringa, S. Anjos, N. Antilogus, P. Apel, W.-D. Arnoud, Y. Ask, S. Asman, B. Augustin, J.E. Augustinus, A. Baillon, P. Ballestrero, A. Bambade, P. Barbier, R. Bardin, D. Barker, G.J. Baroncelli, A. Battaglia, M. Baubillier, M. Becks, K.-H. Begalli, M. Behrmann, A. Ben-Haim, E. Benekos, N. Benvenuti, A. Berat, C. Berggren, M. Bertrand, D. Besancon, M. Besson, N. Bloch, D. Blom, M. Bluj, M. Bonesini, M. Boonekamp, M. Booth, P.S.L. Borisov, G. Botner, O. Bouquet, B. Bowcock, T.J.V. Boyko, I. Bracko, M. Brenner, R. Brodet, E. Bruckman, P. Brunet, J.M. Buschbeck, B. Buschmann, P. Calvi, M. Camporesi, T. Canale, V. Carena, F. Castro, N. Cavallo, F. Chapkin, M. Charpentier, P. Checchia, P. Chierici, R. Chliapnikov, P. Chudoba, J. Chung, S.U. Cieslik, K. Collins, P. Contri, R. Cosme, G. Cossutti, F. Costa, M.J. Crennell, D. Cuevas, J. D'Hondt, J. da Silva, T. da Silva, W. Della Ricca, G. de Angelis, A. de Boer, W. de Clercq, C. de Lotto, B. de Maria, N. de Min, A. de Paula, L. Di Ciaccio, L. Di Simone, A. Doroba, K. Drees, J. Eigen, G. Ekelof, T. Ellert, M. Elsing, M. Espirito Santo, M.C. Fanourakis, G. Fassouliotis, D. Feindt, M. Fernandez, J. Ferrer, A. Ferro, F. Flagmeyer, U. Foeth, H. Fokitis, E. Fulda-Quenzer, F. Fuster, J. Gandelman, M. Garcia, C. Gavillet, P. Gazis, E. Gokieli, R. Golob, B. Gomez-Ceballos, G. Goncalves, P. Graziani, E. Grosdidier, G. Grzelak, K. Guy, J. Haag, C. Hallgren, A. Hamacher, K. Hamilton, K. Haug, S. Hauler, F. Hedberg, V. Hennecke, M. Hoffman, J. Holmgren, S.-O. Holt, P.J. Houlden, M.A. Jackson, J.N. Jarlskog, G. Jarry, P. Jeans, D. Johansson, E.K. Jonsson, P. Joram, C. Jungermann, L. Kapusta, F. Katsanevas, S. Katsoufis, E. Kernel, G. Kersevan, B.P. Kerzel, U. King, B.T. Kjaer, N.J. Kluit, P. Kokkinias, P. Kourkoumelis, C. Kouznetsov, O. Krumstein, Z. Kucharczyk, M. Lamsa, J. Leder, G. Ledroit, F. Leinonen, L. Leitner, R. Lemonne, J. Lepeltier, V. Lesiak, T. Liebig, W. Liko, D. Lipniacka, A. Lopes, J.H. Lopez, J.M. Loukas, D. Lutz, P. Lyons, L. Macnaughton, J. Malek, A. Maltezos, S. Mandl, F. Marco, J. Marco, R. Marechal, B. Margoni, M. Marin, J.-C. Mariotti, C. Markou, A. Martinez-Rivero, C. Masik, J. Mastroyiannopoulos, N. Matorras, F. Matteuzzi, C. Mazzucato, F. Mazzucato, M. Mc Nulty, R. Meroni, C. Migliore, E. Mitaroff, W. Mjoernmark, U. Moa, T. Moch, M. Moenig, K. Monge, R. Montenegro, J. Moraes, D. Moreno, S. Morettini, P. Mueller, U. Muenich, K. Mulders, M. Mundim, L. Murray, W. Muryn, B. Myatt, G. Myklebust, T. Nassiakou, M. Navarria, F. Nawrocki, K. Nemecek, S. Nicolaidou, R. Nikolenko, M. Oblakowska-Mucha, A. Obraztsov, V. Olshevski, A. Onofre, A. Orava, R. Osterberg, K. Ouraou, A. Oyanguren, A. Paganoni, M. Paiano, S. Palacios, J.P. Palka, H. Papadopoulou, T.D. Pape, L. Parkes, C. Parodi, F. Parzefall, U. Passeri, A. Passon, O. Peralta, L. Perepelitsa, V. Perrotta, A. Petrolini, A. Piedra, J. Pieri, L. Pierre, F. Pimenta, M. Piotto, E. Podobnik, T. Poireau, V. Pol, M.E. Polok, G. Pozdniakov, V. Pukhaeva, N. Pullia, A. Radojicic, D. Rebecchi, P. Rehn, J. Reid, D. Reinhardt, R. Renton, P. Richard, F. Ridky, J. Rivero, M. Rodriguez, D. Romero, A. Ronchese, P. Roudeau, P. Rovelli, T. Ruhlmann-Kleider, V. Ryabtchikov, D. Sadovsky, A. Salmi, L. Salt, J. Sander, C. Savoy-Navarro, A. Schwickerath, U. Sekulin, R. Siebel, M. Sisakian, A. Smadja, G. Smirnova, O. Sokolov, A. Sopczak, A. Sosnowski, R. Spassov, T. Stanitzki, M. Stocchi, A. Strauss, J. Stugu, B. Szczekowski, M. Szeptycka, M. Szumlak, T. Tabarelli, T. Tegenfeldt, F. Timmermans, J. Tkatchev, L. Tobin, M. Todorovova, S. Tome, B. Tonazzo, A. Tortosa, P. Travnicek, P. Treille, D. Tristram, G. Trochimczuk, M. Troncon, C. Turluer, M.-L. Tyapkin, I.A. Tyapkin, P. Tzamarias, S. Uvarov, V. Valenti, G. van Dam, P. van Eldik, J. van Remortel, N. van Vulpen, I. Vegni, G. Veloso, F. Venus, W. Verdier, P. Verzi, V. Vilanova, D. Vitale, L. Vrba, V. Wahlen, H. Washbrook, A.J. Weiser, C. Wicke, D. Wickens, J. Wilkinson, G. Winter, M. Witek, M. Yushchenko, O. Zalewska, A. Zalewski, P. Zavrtanik, D. Zhuravlov, V. Zimin, N.I. Zintchenko, A. Zupan, M.

Abstract

The nature of b-quark jet hadronisation has been investigated using data taken at the Z peak by the DELPHI detector at LEP. Two complementarymethods are used to reconstruct the energy of weakly decaying b-hadrons, EweakB. The average value of xweakB = EweakB/Ebeam is measured to be 0.699 ± 0.011. The resulting xweakB distribution is then analysed in the framework of two choices for the perturbative contribution (parton shower and Next to Leading Log QCD calculation) in order to extract measurements of the non-perturbative contribution to be used in studies of bhadron production in other experimental environments than LEP. In the parton shower framework, data favour the Lund model ansatz and corresponding values of its parameters have been determined within PYTHIA 6.156 from DELPHI data: a=1.84+0.23-0.21 and b=0.642+0.073-0.063 GeV-2, with a correlation factor ρ=92.2%. Combining the data on the b-quark fragmentation distributions with those obtained at the Z peak by ALEPH, OPAL and SLD, the average value of xweakB is found to be 0.7092 ± 0.0025 and the non-perturbative fragmentation component is extracted. Using the combined distribution, a better determination of the Lund parameters is also obtained: a = 1.48+0.11-0.10 and b = 0.509+0.024-0.023 GeV-2, with a correlation factor ρ 92.6%. © The Author(s) 2011.

Published
2011

17. Measurements of CP-conserving trilinear gauge boson couplings WWV (V ≡ γ, Z) in e+e- collisions at LEP2

Author

Abdallah, J. Abreu, P. Adam, W. Adzic, P. Albrecht, T. Alemany-Fernandez, R. Allmendinger, T. Allport, P.P. Amaldi, U. Amapane, N. Amato, S. Anashkin, E. Andreazza, A. Andringa, S. Anjos, N. Antilogus, P. Apel, W. Arnoud, Y. Ask, S. Asman, B. Augustin, J.E. Augustinus, A. Baillon, P. Ballestrero, A. Bambade, P. Barbier, R. Bardin, D. Barker, G.J. Baroncelli, A. Battaglia, M. Baubillier, M. Becks, K. Begalli, M. Behrmann, A. Ben-Haim, E. Benekos, N. Benvenuti, A. Berat, C. Berggren, M. Bertrand, D. Besancon, M. Besson, N. Bloch, D. Blom, M. Bluj, M. Bonesini, M. Boonekamp, M. Booth, P.S.L. Borisov, G. Botner, O. Bouquet, B. Bowcock, T.J.V. Boyko, I. Bracko, M. Brenner, R. Brodet, E. Bruckman, P. Brunet, J.M. Buschbeck, B. Buschmann, P. Calvi, M. Camporesi, T. Canale, V. Carena, F. Castro, N. Cavallo, F. Chapkin, M. Charpentier, P. Checchia, P. Chierici, R. Chliapnikov, P. Chudoba, J. Chung, S.U. Cieslik, K. Collins, P. Contri, R. Cosme, G. Cossutti, F. Costa, M.J. Crennell, D. Cuevas, J. D'Hondt, J. da Silva, T. da Silva, W. della Ricca, G. de Angelis, A. de Boer, W. de Clercq, C. de Lotto, B. de Maria, N. de Min, A. de Paula, L. Ciaccio, L.D. Simone, A.D. Doroba, K. Drees, J. Eigen, G. Ekelof, T. Ellert, M. Elsing, M. Santo, M.C.E. Fanourakis, G. Fassouliotis, D. Feindt, M. Fernandez, J. Ferrer, A. Ferro, F. Flagmeyer, U. Foeth, H. Fokitis, E. Fulda-Quenzer, F. Fuster, J. Gandelman, M. Garcia, C. Gavillet, P. Gazis, E. Gokieli, R. Golob, B. Gomez-Ceballos, G. Goncalves, P. Graziani, E. Grosdidier, G. Grzelak, K. Guy, J. Haag, C. Hallgren, A. Hamacher, K. Hamilton, K. Haug, S. Hauler, F. Hedberg, V. Hennecke, M. Hoffman, J. Holmgren, S. Holt, P.J. Houlden, M.A. Jackson, J.N. Jarlskog, G. Jarry, P. Jeans, D. Johansson, E.K. Jonsson, P. Joram, C. Jungermann, L. Kapusta, F. Katsanevas, S. Katsoufis, E. Kernel, G. Kersevan, B.P. Kerzel, U. King, B.T. Kjaer, N.J. Kluit, P. Kokkinias, P. Kostioukhine, V. Kourkoumelis, C. Kouznetsov, O. Krumstein, Z. Kucharczyk, M. Lamsa, J. Leder, G. Ledroit, F. Leinonen, L. Leitner, R. Lemonne, J. Lepeltier, V. Lesiak, T. Libby, J. Liebig, W. Liko, D. Lipniacka, A. Lopes, J.H. Lopez, J.M. Loukas, D. Lutz, P. Lyons, L. MacNaughton, J. Malek, A. Maltezos, S. Mandl, F. Marco, J. Marco, R. Marechal, B. Margoni, M. Marin, J. Mariotti, C. Markou, A. Martinez-Rivero, C. Masik, J. Mastroyiannopoulos, N. Matorras, F. Matteuzzi, C. Mazzucato, F. Mazzucato, M. Nulty, R.M. Meroni, C. Migliore, E. Mitaroff, W. Mjoernmark, U. Moa, T. Moch, M. Moenig, K. Monge, R. Montenegro, J. Moraes, D. Moreno, S. Morettini, P. Mueller, U. Muenich, K. Mulders, M. Mundim, L. Murray, W. Muryn, B. Myatt, G. Myklebust, T. Nassiakou, M. Navarria, F. Nawrocki, K. Nemecek, S. Nicolaidou, R. Nikolenko, M. Oblakowska-Mucha, A. Obraztsov, V. Olshevski, A. Onofre, A. Orava, R. Osterberg, K. Ouraou, A. Oyanguren, A. Paganoni, M. Paiano, S. Palacios, J.P. Palka, H. Papadopoulou, T.D. Pape, L. Parkes, C. Parodi, F. Parzefall, U. Passeri, A. Passon, O. Peralta, L. Perepelitsa, V. Perrotta, A. Petrolini, A. Piedra, J. Pieri, L. Pierre, F. Pimenta, M. Piotto, E. Podobnik, T. Poireau, V. Pol, M.E. Polok, G. Pozdniakov, V. Pukhaeva, N. Pullia, A. Radojicic, D. Rebecchi, P. Rehn, J. Reid, D. Reinhardt, R. Renton, P. Richard, F. Ridky, J. Rivero, M. Rodriguez, D. Romero, A. Ronchese, P. Roudeau, P. Rovelli, T. Ruhlmann-Kleider, V. Ryabtchikov, D. Sadovsky, A. Salmi, L. Salt, J. Sander, C. Savoy-Navarro, A. Schwickerath, U. Sekulin, R. Siebel, M. Sisakian, A. Smadja, G. Smirnova, O. Sokolov, A. Sopczak, A. Sosnowski, R. Spassov, T. Stanitzki, M. Stocchi, A. Strauss, J. Stugu, B. Szczekowski, M. Szeptycka, M. Szumlak, T. Tabarelli, T. Tegenfeldt, F. Terranova, F. Timmermans, J. Tkatchev, L. Tobin, M. Todorovova, S. Tome, B. Tonazzo, A. Tortosa, P. Travnicek, P. Treille, D. Tristram, G. Trochimczuk, M. Troncon, C. Turluer, M. Tyapkin, I.A. Tyapkin, P. Tzamarias, S. Uvarov, V. Valenti, G. van Dam, P. van Eldik, J. van Lysebetten, A. van Remortel, N. van Vulpen, I. Vegni, G. Veloso, F. Venus, W. Verdier, P. Verzi, V. Vilanova, D. Vitale, L. Vrba, V. Wahlen, H. Washbrook, A.J. Weiser, C. Wicke, D. Wickens, J. Wilkinson, G. Winter, M. Witek, M. Yushchenko, O. Zalewska, A. Zalewski, P. Zavrtanik, D. Zhuravlov, V. Zimin, N.I. Zintchenko, A. Zupan, M.

Subjects
High Energy Physics::Experiment
Abstract

The data taken by Delphi at centre-of-mass energies between 189 and 209 GeV are used to place limits on the CP-conserving trilinear gauge boson couplings Δ gZ1, λγ and Δκγ associated to W+W- and single W production at Lep2. Using data from the jjℓν, jjjj, jjX and ℓX final states, where j, ℓ and X represent a jet, a lepton and missing four-momentum, respectively, the following limits are set on the couplings when one parameter is allowed to vary and the others are set to their Standard Model values of zero: Results are also presented when two or three parameters are allowed to vary. All observations are consistent with the predictions of the Standard Model and supersede the previous results on these gauge coupling parameters published by Delphi. © © Springer-Verlag / Società Italiana di Fisica 2010.

Published
2010

18. Study of the dependence of direct soft photon production on the jet characteristics in hadronic Z0 decays

Author

Abdallah, J. Abreu, P. Adam, W. Adzic, P. Albrecht, T. Alemany-Fernandez, R. Allmendinger, T. Allport, P.P. Amaldi, U. Amapane, N. Amato, S. Anashkin, E. Andreazza, A. Andringa, S. Anjos, N. Antilogus, P. Apel, W. Arnoud, Y. Ask, S. Asman, B. Augustin, J.E. Augustinus, A. Baillon, P. Ballestrero, A. Bambade, P. Barbier, R. Bardin, D. Barker, G.J. Baroncelli, A. Battaglia, M. Baubillier, M. Becks, K. Begalli, M. Behrmann, A. Ben-Haim, E. Benekos, N. Benvenuti, A. Berat, C. Berggren, M. Bertrand, D. Besancon, M. Besson, N. Bloch, D. Blom, M. Bluj, M. Bonesini, M. Boonekamp, M. Booth, P.S.L. Borisov, G. Botner, O. Bouquet, B. Bowcock, T.J.V. Boyko, I. Bracko, M. Brenner, R. Brodet, E. Bruckman, P. Brunet, J.M. Buschbeck, B. Buschmann, P. Calvi, M. Camporesi, T. Canale, V. Carena, F. Castro, N. Cavallo, F. Chapkin, M. Charpentier, P. Checchia, P. Chierici, R. Chliapnikov, P. Chudoba, J. Chung, S.U. Cieslik, K. Collins, P. Contri, R. Cosme, G. Cossutti, F. Costa, M.J. Crennell, D. Cuevas, J. D'Hondt, J. da Silva, T. Da Silva, W. della Ricca, G. de Angelis, A. de Boer, W. de Clercq, C. de Lotto, B. de Maria, N. de Min, A. de Paula, L. Di Ciaccio, L. Di Simone, A. Doroba, K. Drees, J. Eigen, G. Ekelof, T. Ellert, M. Elsing, M. Espirito Santo, M.C. Fanourakis, G. Fassouliotis, D. Feindt, M. Fernandez, J. Ferrer, A. Ferro, F. Flagmeyer, U. Foeth, H. Fokitis, E. Fulda-Quenzer, F. Fuster, J. Gandelman, M. Garcia, C. Gavillet, P. Gazis, E. Gokieli, R. Golob, B. Gomez-Ceballos, G. Goncalves, P. Graziani, E. Grosdidier, G. Grzelak, K. Guy, J. Haag, C. Hallgren, A. Hamacher, K. Hamilton, K. Haug, S. Hauler, F. Hedberg, V. Hennecke, M. Hoffman, J. Holmgren, S. Holt, P.J. Houlden, M.A. Jackson, J.N. Jarlskog, G. Jarry, P. Jeans, D. Johansson, E.K. Jonsson, P. Joram, C. Jungermann, L. Kapusta, F. Katsanevas, S. Katsoufis, E. Kernel, G. Kersevan, B.P. Kerzel, U. King, B.T. Kjaer, N.J. Kluit, P. Kokkinias, P. Kourkoumelis, C. Kouznetsov, O. Krumstein, Z. Kucharczyk, M. Lamsa, J. Leder, G. Ledroit, F. Leinonen, L. Leitner, R. Lemonne, J. Lepeltier, V. Lesiak, T. Liebig, W. Liko, D. Lipniacka, A. Lopes, J.H. Lopez, J.M. Loukas, D. Lutz, P. Lyons, L. MacNaughton, J. Malek, A. Maltezos, S. Mandl, F. Marco, J. Marco, R. Marechal, B. Margoni, M. Marin, J. Mariotti, C. Markou, A. Martinez-Rivero, C. Masik, J. Mastroyiannopoulos, N. Matorras, F. Matteuzzi, C. Mazzucato, F. Mazzucato, M. Mc Nulty, R. Meroni, C. Migliore, E. Mitaroff, W. Mjoernmark, U. Moa, T. Moch, M. Moenig, K. Monge, R. Montenegro, J. Moraes, D. Moreno, S. Morettini, P. Mueller, U. Muenich, K. Mulders, M. Mundim, L. Murray, W. Muryn, B. Myatt, G. Myklebust, T. Nassiakou, M. Navarria, F. Nawrocki, K. Nemecek, S. Nicolaidou, R. Nikolenko, M. Oblakowska-Mucha, A. Obraztsov, V. Olshevski, A. Onofre, A. Orava, R. Osterberg, K. Ouraou, A. Oyanguren, A. Paganoni, M. Paiano, S. Palacios, J.P. Palka, H. Papadopoulou, T.D. Pape, L. Parkes, C. Parodi, F. Parzefall, U. Passeri, A. Passon, O. Peralta, L. Perepelitsa, V. Perrotta, A. Petrolini, A. Piedra, J. Pieri, L. Pierre, F. Pimenta, M. Piotto, E. Podobnik, T. Poireau, V. Pol, M.E. Polok, G. Pozdniakov, V. Pukhaeva, N. Pullia, A. Radojicic, D. Rebecchi, P. Rehn, J. Reid, D. Reinhardt, R. Renton, P. Richard, F. Ridky, J. Rivero, M. Rodriguez, D. Romero, A. Ronchese, P. Roudeau, P. Rovelli, T. Ruhlmann-Kleider, V. Ryabtchikov, D. Sadovsky, A. Salmi, L. Salt, J. Sander, C. Savoy-Navarro, A. Schwickerath, U. Sekulin, R. Siebel, M. Sisakian, A. Smadja, G. Smirnova, O. Sokolov, A. Sopczak, A. Sosnowski, R. Spassov, T. Stanitzki, M. Stocchi, A. Strauss, J. Stugu, B. Szczekowski, M. Szeptycka, M. Szumlak, T. Tabarelli, T. Tegenfeldt, F. Timmermans, J. Tkatchev, L. Tobin, M. Todorovova, S. Tome, B. Tonazzo, A. Tortosa, P. Travnicek, P. Treille, D. Tristram, G. Trochimczuk, M. Troncon, C. Turluer, M. Tyapkin, I.A. Tyapkin, P. Tzamarias, S. Uvarov, V. Valenti, G. Van Dam, P. Van Eldik, J. van Remortel, N. Van Vulpen, I. Vegni, G. Veloso, F. Venus, W. Verdier, P. Verzi, V. Vilanova, D. Vitale, L. Vrba, V. Wahlen, H. Washbrook, A.J. Weiser, C. Wicke, D. Wickens, J. Wilkinson, G. Winter, M. Witek, M. Yushchenko, O. Zalewska, A. Zalewski, P. Zavrtanik, D. Zhuravlov, V. Zimin, N.I. Zintchenko, A. Zupan, M.

Subjects
Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Experiment
Abstract

An analysis of the direct soft photon production rate as a function of the parent jet characteristics is presented, based on hadronic events collected by the DELPHI experiment at LEP1. The dependences of the photon rates on the jet kinematic characteristics (momentum, mass, etc.) and on the jet charged, neutral and total hadron multiplicities are reported. Up to a scale factor of about four, which characterizes the overall value of the soft photon excess, a similarity of the observed soft photon behavior to that of the inner hadronic bremsstrahlung predictions is found for the momentum, mass, and jet charged multiplicity dependences. However for the dependence of the soft photon rate on the jet neutral and total hadron multiplicities a prominent difference is found for the observed soft photon signal as compared to the expected bremsstrahlung from final state hadrons. The observed linear increase of the soft photon production rate with the jet total hadron multiplicity and its strong dependence on the jet neutral multiplicity suggest that the rate is proportional to the number of quark pairs produced in the fragmentation process, with the neutral pairs being more effectively radiating than the charged ones. © 2010 The Author(s).

Published
2010

19. Inclusive single-particle production in two-photon collisions at LEP II with the DELPHI detector

Author

Abdallah, J. Abreu, P. Adam, W. Adzic, P. Albrecht, T. Alemany-Fernandez, R. Allmendinger, T. Allport, P.P. Amaldi, U. Amapane, N. Amato, S. Anashkin, E. Andreazza, A. Andringa, S. Anjos, N. Antilogus, P. Apel, W.-D. Arnoud, Y. Ask, S. Asman, B. Augustin, J.E. Augustinus, A. Baillon, P. Ballestrero, A. Bambade, P. Barbier, R. Bardin, D. Barker, G.J. Baroncelli, A. Battaglia, M. Baubillier, M. Becks, K.-H. Begalli, M. Behrmann, A. Ben-Haim, E. Benekos, N. Benvenuti, A. Berat, C. Berggren, M. Bertrand, D. Besancon, M. Besson, N. Bloch, D. Blom, M. Bluj, M. Bonesini, M. Boonekamp, M. Booth, P.S.L. Borisov, G. Botner, O. Bouquet, B. Bowcock, T.J.V. Boyko, I. Bracko, M. Brenner, R. Brodet, E. Bruckman, P. Brunet, J.M. Buschbeck, B. Buschmann, P. Calvi, M. Camporesi, T. Canale, V. Carena, F. Castro, N. Cavallo, F. Chapkin, M. Charpentier, Ph. Checchia, P. Chierici, R. Chliapnikov, P. Chudoba, J. Chung, S.U. Cieslik, K. Collins, P. Contri, R. Cosme, G. Cossutti, F. Costa, M.J. Crennell, D. Cuevas, J. D'Hondt, J. da Silva, T. Da Silva, W. Ricca, G.D. De Angelis, A. De Boer, W. De Clercq, C. De Lotto, B. De Maria, N. De Min, A. de Paula, L. Di Ciaccio, L. Di Simone, A. Doroba, K. Drees, J. Eigen, G. Ekelof, T. Ellert, M. Elsing, M. Santo, M.C.E. Fanourakis, G. Fassouliotis, D. Feindt, M. Fernandez, J. Ferrer, A. Ferro, F. Flagmeyer, U. Foeth, H. Fokitis, E. Fulda-Quenzer, F. Fuster, J. Gandelman, M. Garcia, C. Gavillet, Ph. Gazis, E. Gokieli, R. Golob, B. Gomez-Ceballos, G. Goncalves, P. Graziani, E. Grosdidier, G. Grzelak, K. Guy, J. Haag, C. Hallgren, A. Hamacher, K. Hamilton, K. Haug, S. Hauler, F. Hedberg, V. Hennecke, M. Hoffman, J. Holmgren, S.-O. Holt, P.J. Houlden, M.A. Jackson, J.N. Jarlskog, G. Jarry, P. Jeans, D. Johansson, E.K. Jonsson, P. Joram, C. Jungermann, L. Kapusta, F. Katsanevas, S. Katsoufis, E. Kernel, G. Kersevan, B.P. Kerzel, U. King, B.T. Kjaer, N.J. Kluit, P. Kokkinias, P. Kourkoumelis, C. Kouznetsov, O. Krumstein, Z. Kucharczyk, M. Lamsa, J. Leder, G. Ledroit, F. Leinonen, L. Leitner, R. Lemonne, J. Lepeltier, V. Lesiak, T. Liebig, W. Liko, D. Lipniacka, A. Lopes, J.H. Lopez, J.M. Loukas, D. Lutz, P. Lyons, L. MacNaughton, J. Malek, A. Maltezos, S. Mandl, F. Marco, J. Marco, R. Marechal, B. Margoni, M. Marin, J.-C. Mariotti, C. Markou, A. Martinez-Rivero, C. Masik, J. Mastroyiannopoulos, N. Matorras, F. Matteuzzi, C. Mazzucato, F. Mazzucato, M. Nulty, R.M. Meroni, C. Migliore, E. Mitaroff, W. Mjoernmark, U. Moa, T. Moch, M. Moenig, K. Monge, R. Montenegro, J. Moraes, D. Moreno, S. Morettini, P. Mueller, U. Muenich, K. Mulders, M. Mundim, L. Murray, W. Muryn, B. Myatt, G. Myklebust, T. Nassiakou, M. Navarria, F. Nawrocki, K. Nemecek, S. Nicolaidou, R. Nikolenko, M. Oblakowska-Mucha, A. Obraztsov, V. Olshevski, A. Onofre, A. Orava, R. Osterberg, K. Ouraou, A. Oyanguren, A. Paganoni, M. Paiano, S. Palacios, J.P. Palka, H. Papadopoulou, Th.D. Pape, L. Parkes, C. Parodi, F. Parzefall, U. Passeri, A. Passon, O. Peralta, L. Perepelitsa, V. Perrotta, A. Petrolini, A. Piedra, J. Pieri, L. Pierre, F. Pimenta, M. Piotto, E. Podobnik, T. Poireau, V. Pol, M.E. Polok, G. Pozdniakov, V. Pukhaeva, N. Pullia, A. Radojicic, D. Rebecchi, P. Rehn, J. Reid, D. Reinhardt, R. Renton, P. Richard, F. Ridky, J. Rivero, M. Rodriguez, D. Romero, A. Ronchese, P. Roudeau, P. Rovelli, T. Ruhlmann-Kleider, V. Ryabtchikov, D. Sadovsky, A. Salmi, L. Salt, J. Sander, C. Savoy-Navarro, A. Schwickerath, U. Sekulin, R. Siebel, M. Sisakian, A. Smadja, G. Smirnova, O. Sokolov, A. Sopczak, A. Sosnowski, R. Spassov, T. Stanitzki, M. Stocchi, A. Strauss, J. Stugu, B. Szczekowski, M. Szeptycka, M. Szumlak, T. Tabarelli, T. Tegenfeldt, F. Timmermans, J. Tkatchev, L. Tobin, M. Todorovova, S. Tome, B. Tonazzo, A. Tortosa, P. Travnicek, P. Treille, D. Tristram, G. Trochimczuk, M. Troncon, C. Turluer, M.-L. Tyapkin, I.A. Tyapkin, P. Tzamarias, S. Uvarov, V. Valenti, G. Van Dam, P. Van Eldik, J. van Remortel, N. Van Vulpen, I. Vegni, G. Veloso, F. Venus, W. Verdier, P. Verzi, V. Vilanova, D. Vitale, L. Vrba, V. Wahlen, H. Washbrook, A.J. Weiser, C. Wicke, D. Wickens, J. Wilkinson, G. Winter, M. Witek, M. Yushchenko, O. Zalewska, A. Zalewski, P. Zavrtanik, D. Zhuravlov, V. Zimin, N.I. Zintchenko, A. Zupan, M.

Subjects
High Energy Physics::Phenomenology, High Energy Physics::Experiment, Nuclear Experiment
Abstract

A study of the inclusive charged hadron production in two-photon collisions is described. The data were collected with the DELPHI detector at LEP II. Results on the inclusive single-particle pT distribution and the differential charged hadrons d σ / d pT cross-section are presented and compared to the predictions of perturbative NLO QCD calculations and to published results. © 2009 Elsevier B.V.

Published
2009

20. Search for one large extra dimension with the DELPHI detector at LEP

Author

Abdallah, J. Abreu, P. Adam, W. Adzic, P. Albrecht, T. Alemany-Fernandez, R. Allmendinger, T. Allport, P.P. Amaldi, U. Amapane, N. Amato, S. Anashkin, E. Andreazza, A. Andringa, S. Anjos, N. Antilogus, P. Apel, W.-D. Arnoud, Y. Ask, S. Asman, B. Augustin, J.E. Augustinus, A. Baillon, P. Ballestrero, A. Bambade, P. Barbier, R. Bardin, D. Barker, G.J. Baroncelli, A. Battaglia, M. Baubillier, M. Becks, K.-H. Begalli, M. Behrmann, A. Ben-Haim, E. Benekos, N. Benvenuti, A. Berat, C. Berggren, M. Bertrand, D. Besancon, M. Besson, N. Bloch, D. Blom, M. Bluj, M. Bonesini, M. Boonekamp, M. Booth, P.S.L. Borisov, G. Botner, O. Bouquet, B. Bowcock, T.J.V. Boyko, I. Bracko, M. Brenner, R. Brodet, E. Bruckman, P. Brunet, J.M. Buschbeck, B. Buschmann, P. Calvi, M. Camporesi, T. Canale, V. Carena, F. Castro, N. Cavallo, F. Chapkin, M. Charpentier, P. Checchia, P. Chierici, R. Chliapnikov, P. Chudoba, J. Chung, S.U. Cieslik, K. Collins, P. Contri, R. Cosme, G. Cossutti, F. Costa, M.J. Crennell, D. Cuevas, J. D'Hondt, J. Da Silva, T. Da Silva, W. Della Ricca, G. De Angelis, A. De Boer, W. De Clercq, C. De Lotto, B. De Maria, N. De Min, A. De Paula, L. Di Ciaccio, L. Di Simone, A. Doroba, K. Drees, J. Eigen, G. Ekelof, T. Ellert, M. Elsing, M. Espirito Santo, M.C. Fanourakis, G. Fassouliotis, D. Feindt, M. Fernandez, J. Ferrer, A. Ferro, F. Flagmeyer, U. Foeth, H. Fokitis, E. Fulda-Quenzer, F. Fuster, J. Gandelman, M. Garcia, C. Gavillet, P. Gazis, E. Gokieli, R. Golob, B. Gomez-Ceballos, G. Goncalves, P. Graziani, E. Grosdidier, G. Grzelak, K. Guy, J. Haag, C. Hallgren, A. Hamacher, K. Hamilton, K. Haug, S. Hauler, F. Hedberg, V. Hennecke, M. Hoffman, J. Holmgren, S.-O. Holt, P.J. Houlden, M.A. Jackson, J.N. Jarlskog, G. Jarry, P. Jeans, D. Johansson, E.K. Jonsson, P. Joram, C. Jungermann, L. Kapusta, F. Katsanevas, S. Katsoufis, E. Kernel, G. Kersevan, B.P. Kerzel, U. King, B.T. Kjaer, N.J. Kluit, P. Kokkinias, P. Kourkoumelis, C. Kouznetsov, O. Krumstein, Z. Kucharczyk, M. Lamsa, J. Leder, G. Ledroit, F. Leinonen, L. Leitner, R. Lemonne, J. Lepeltier, V. Lesiak, T. Liebig, W. Liko, D. Lipniacka, A. Lopes, J.H. Lopez, J.M. Loukas, D. Lutz, P. Lyons, L. MacNaughton, J. Malek, A. Maltezos, S. Mandl, F. Marco, J. Marco, R. Marechal, B. Margoni, M. Marin, J.-C. Mariotti, C. Markou, A. Martinez-Rivero, C. Masik, J. Mastroyiannopoulos, N. Matorras, F. Matteuzzi, C. Mazzucato, F. Mazzucato, M. Mc Nulty, R. Meroni, C. Migliore, E. Mitaroff, W. Mjoernmark, U. Moa, T. Moch, M. Moenig, K. Monge, R. Montenegro, J. Moraes, D. Moreno, S. Morettini, P. Mueller, U. Muenich, K. Mulders, M. Mundim, L. Murray, W. Muryn, B. Myatt, G. Myklebust, T. Nassiakou, M. Navarria, F. Nawrocki, K. Nemecek, S. Nicolaidou, R. Nikolenko, M. Oblakowska-Mucha, A. Obraztsov, V. Olshevski, A. Onofre, A. Orava, R. Osterberg, K. Ouraou, A. Oyanguren, A. Paganoni, M. Paiano, S. Palacios, J.P. Palka, H. Papadopoulou, Th.D. Pape, L. Parkes, C. Parodi, F. Parzefall, U. Passeri, A. Passon, O. Peralta, L. Perepelitsa, V. Perrotta, A. Petrolini, A. Piedra, J. Pieri, L. Pierre, F. Pimenta, M. Piotto, E. Podobnik, T. Poireau, V. Pol, M.E. Polok, G. Pozdniakov, V. Pukhaeva, N. Pullia, A. Radojicic, D. Rebecchi, P. Rehn, J. Reid, D. Reinhardt, R. Renton, P. Richard, F. Ridky, J. Rivero, M. Rodriguez, D. Romero, A. Ronchese, P. Roudeau, P. Rovelli, T. Ruhlmann-Kleider, V. Ryabtchikov, D. Sadovsky, A. Salmi, L. Salt, J. Sander, C. Savoy-Navarro, A. Schwickerath, U. Sekulin, R. Siebel, M. Sisakian, A. Smadja, G. Smirnova, O. Sokolov, A. Sopczak, A. Sosnowski, R. Spassov, T. Stanitzki, M. Stocchi, A. Strauss, J. Stugu, B. Szczekowski, M. Szeptycka, M. Szumlak, T. Tabarelli, T. Tegenfeldt, F. Timmermans, J. Tkatchev, L. Tobin, M. Todorovova, S. Tome, B. Tonazzo, A. Tortosa, P. Travnicek, P. Treille, D. Tristram, G. Trochimczuk, M. Troncon, C. Turluer, M.-L. Tyapkin, I.A. Tyapkin, P. Tzamarias, S. Uvarov, V. Valenti, G. Van Dam, P. Van Eldik, J. Van Remortel, N. Van Vulpen, I. Vegni, G. Veloso, F. Venus, W. Verdier, P. Verzi, V. Vilanova, D. Vitale, L. Vrba, V. Wahlen, H. Washbrook, A.J. Weiser, C. Wicke, D. Wickens, J. Wilkinson, G. Winter, M. Witek, M. Yushchenko, O. Zalewska, A. Zalewski, P. Zavrtanik, D. Zhuravlov, V. Zimin, N.I. Zintchenko, A. Zupan, M.

Subjects
High Energy Physics::Experiment
Abstract

Single photons detected by the DELPHI experiment at LEP2 in the years 1997-2000 are reanalysed to investigate the existence of a single extra dimension in a modified ADD scenario with slightly warped large extra dimensions. The data collected at centre-of-mass energies between 180 and 209 GeV for an integrated luminosity of 650 pb-1 agree with the predictions of the Standard Model and allow a limit to be set on graviton emission in one large extra dimension. The limit obtained on the fundamental mass scale M D is 1.69 TeV/c 2 at 95% CL, with an expected limit of 1.71 TeV/c 2. © 2009 Springer-Verlag / Società Italiana di Fisica.

Published
2009

21. A study of bb̄ production in e+e- collisions at √ = 130-207 GeV

Author

Abdallah, J. Abreu, P. Adam, W. Adzic, P. Albrecht, T. Alemany-Fernandez, R. Allmendinger, T. Allport, P.P. Amaldi, U. Amapane, N. Amato, S. Anashkin, E. Andreazza, A. Andringa, S. Anjos, N. Antilogus, P. Apel, W.-D. Arnoud, Y. Ask, S. Asman, B. Augustin, J.E. Augustinus, A. Baillon, P. Ballestrero, A. Bambade, P. Barbier, R. Bardin, D. Barker, G.J. Baroncelli, A. Battaglia, M. Baubillier, M. Becks, K.-H. Begalli, M. Behrmann, A. Ben-Haim, E. Benekos, N. Benvenuti, A. Berat, C. Berggren, M. Bertrand, D. Besancon, M. Besson, N. Bloch, D. Blom, M. Bluj, M. Bonesini, M. Boonekamp, M. Booth, P.S.L. Borisov, G. Botner, O. Bouquet, B. Bowcock, T.J.V. Boyko, I. Bracko, M. Brenner, R. Brodet, E. Bruckman, P. Brunet, J.M. Buschbeck, B. Buschmann, P. Calvi, M. Camporesi, T. Canale, V. Carena, F. Castro, N. Cavallo, F. Chapkin, M. Charpentier, P. Checchia, P. Chierici, R. Chliapnikov, P. Chudoba, J. Chung, S.U. Cieslik, K. Collins, P. Contri, R. Cosme, G. Cossutti, F. Costa, M.J. Crennell, D. Cuevas, J. D'Hondt, J. Da Silva, T. Da Silva, W. Della Ricca, G. De Angelis, A. De Boer, W. De Clercq, C. De Lotto, B. De Maria, N. De Min, A. De Paula, L. Di Ciaccio, L. Di Simone, A. Doroba, K. Drees, J. Eigen, G. Ekelof, T. Ellert, M. Elsing, M. Espirito Santo, M.C. Fanourakis, G. Fassouliotis, D. Feindt, M. Fernandez, J. Ferrer, A. Ferro, F. Flagmeyer, U. Foeth, H. Fokitis, E. Fulda-Quenzer, F. Fuster, J. Gandelman, M. Garcia, C. Gavillet, P. Gazis, E. Gokieli, R. Golob, B. Gomez-Ceballos, G. Goncalves, P. Graziani, E. Grosdidier, G. Grzelak, K. Guy, J. Haag, C. Hallgren, A. Hamacher, K. Hamilton, K. Haug, S. Hauler, F. Hedberg, V. Hennecke, M. Hoffman, J. Holmgren, S.-O. Holt, P.J. Houlden, M.A. Jackson, J.N. Jarlskog, G. Jarry, P. Jeans, D. Johansson, E.K. Jonsson, P. Joram, C. Jungermann, L. Kapusta, F. Katsanevas, S. Katsoufis, E. Kernel, G. Kersevan, B.P. Kerzel, U. King, B.T. Kjaer, N.J. Kluit, P. Kokkinias, P. Kourkoumelis, C. Kouznetsov, O. Krumstein, Z. Kucharczyk, M. Lamsa, J. Leder, G. Ledroit, F. Leinonen, L. Leitner, R. Lemonne, J. Lepeltier, V. Lesiak, T. Liebig, W. Liko, D. Lipniacka, A. Lopes, J.H. Lopez, J.M. Loukas, D. Lutz, P. Lyons, L. MacNaughton, J. Malek, A. Maltezos, S. Mandl, F. Marco, J. Marco, R. Marechal, B. Margoni, M. Marin, J.-C. Mariotti, C. Markou, A. Martinez-Rivero, C. Masik, J. Mastroyiannopoulos, N. Matorras, F. Matteuzzi, C. Mazzucato, F. Mazzucato, M. Mc Nulty, R. Meroni, C. Migliore, E. Mitaroff, W. Mjoernmark, U. Moa, T. Moch, M. Moenig, K. Monge, R. Montenegro, J. Moraes, D. Moreno, S. Morettini, P. Mueller, U. Muenich, K. Mulders, M. Mundim, L. Murray, W. Muryn, B. Myatt, G. Myklebust, T. Nassiakou, M. Navarria, F. Nawrocki, K. Nemecek, S. Nicolaidou, R. Nikolenko, M. Oblakowska-Mucha, A. Obraztsov, V. Olshevski, A. Onofre, A. Orava, R. Osterberg, K. Ouraou, A. Oyanguren, A. Paganoni, M. Paiano, S. Palacios, J.P. Palka, H. Papadopoulou, Th.D. Pape, L. Parkes, C. Parodi, F. Parzefall, U. Passeri, A. Passon, O. Peralta, L. Perepelitsa, V. Perrotta, A. Petrolini, A. Piedra, J. Pieri, L. Pierre, F. Pimenta, M. Piotto, E. Podobnik, T. Poireau, V. Pol, M.E. Polok, G. Pozdniakov, V. Pukhaeva, N. Pullia, A. Radojicic, D. Rebecchi, P. Rehn, J. Reid, D. Reinhardt, R. Renton, P. Richard, F. Ridky, J. Rivero, M. Rodriguez, D. Romero, A. Ronchese, P. Roudeau, P. Rovelli, T. Ruhlmann-Kleider, V. Ryabtchikov, D. Sadovsky, A. Salmi, L. Salt, J. Sander, C. Savoy-Navarro, A. Schwickerath, U. Sekulin, R. Siebel, M. Sisakian, A. Smadja, G. Smirnova, O. Sokolov, A. Sopczak, A. Sosnowski, R. Spassov, T. Stanitzki, M. Stocchi, A. Strauss, J. Stugu, B. Szczekowski, M. Szeptycka, M. Szumlak, T. Tabarelli, T. Tegenfeldt, F. Timmermans, J. Tkatchev, L. Tobin, M. Todorovova, S. Tome, B. Tonazzo, A. Tortosa, P. Travnicek, P. Treille, D. Tristram, G. Trochimczuk, M. Troncon, C. Turluer, M.-L. Tyapkin, I.A. Tyapkin, P. Tzamarias, S. Uvarov, V. Valenti, G. Van Dam, P. Van Eldik, J. Van Remortel, N. Van Vulpen, I. Vegni, G. Veloso, F. Venus, W. Verdier, P. Verzi, V. Vilanova, D. Vitale, L. Vrba, V. Wahlen, H. Washbrook, A.J. Weiser, C. Wicke, D. Wickens, J. Wilkinson, G. Winter, M. Witek, M. Yushchenko, O. Zalewska, A. Zalewski, P. Zavrtanik, D. Zhuravlov, V. Zimin, N.I. Zintchenko, A. Zupan, M.

Abstract

Measurements are presented of R b, the ratio of the cross-section to the cross-section in e+e- collisions, and the forward-backward asymmetry A FB b at twelve energy points in the range sqrts=130-207 GeV. These results are found to be consistent with the Standard Model expectations. The measurements are used to set limits on new physics scenarios involving contact interactions. © 2009 Springer-Verlag / Società Italiana di Fisica.

Published
2009

22. Observation of the muon inner bremsstrahlung at LEP1

Author

Abdallah, J. Abreu, P. Adam, W. Adzic, P. Albrecht, T. Alemany-Fernandez, R. Allmendinger, T. Allport, P.P. Amaldi, U. Amapane, N. Amato, S. Anashkin, E. Andreazza, A. Andringa, S. Anjos, N. Antilogus, P. Apel, W.-D. Arnoud, Y. Ask, S. Asman, B. Augustin, J.E. Augustinus, A. Baillon, P. Ballestrero, A. Bambade, P. Barbier, R. Bardin, D. Barker, G.J. Baroncelli, A. Battaglia, M. Baubillier, M. Becks, K.-H. Begalli, M. Behrmann, A. Ben-Haim, E. Benekos, N. Benvenuti, A. Berat, C. Berggren, M. Bertrand, D. Besancon, M. Besson, N. Bloch, D. Blom, M. Bluj, M. Bonesini, M. Boonekamp, M. Booth, P.S.L. Borisov, G. Botner, O. Bouquet, B. Bowcock, T.J.V. Boyko, I. Bracko, M. Brenner, R. Brodet, E. Bruckman, P. Brunet, J.M. Buschbeck, B. Buschmann, P. Calvi, M. Camporesi, T. Canale, V. Carena, F. Castro, N. Cavallo, F. Chapkin, M. Charpentier, P. Checchia, P. Chierici, R. Chliapnikov, P. Chudoba, J. Chung, S.U. Cieslik, K. Collins, P. Contri, R. Cosme, G. Cossutti, F. Costa, M.J. Crennell, D. Cuevas, J. D'Hondt, J. Da Silva, T. Da Silva, W. Della Ricca, G. De Angelis, A. De Boer, W. De Clercq, C. De Lotto, B. De Maria, N. De Min, A. De Paula, L. Di Ciaccio, L. Di Simone, A. Doroba, K. Drees, J. Eigen, G. Ekelof, T. Ellert, M. Elsing, M. Espirito Santo, M.C. Fanourakis, G. Fassouliotis, D. Feindt, M. Fernandez, J. Ferrer, A. Ferro, F. Flagmeyer, U. Foeth, H. Fokitis, E. Fulda-Quenzer, F. Fuster, J. Gandelman, M. Garcia, C. Gavillet, P. Gazis, E. Gokieli, R. Golob, B. Gomez-Ceballos, G. Goncalves, P. Graziani, E. Grosdidier, G. Grzelak, K. Guy, J. Haag, C. Hallgren, A. Hamacher, K. Hamilton, K. Haug, S. Hauler, F. Hedberg, V. Hennecke, M. Herr, H. Hoffman, J. Holmgren, S.-O. Holt, P.J. Houlden, M.A. Jackson, J.N. Jarlskog, G. Jarry, P. Jeans, D. Johansson, E.K. Jonsson, P. Joram, C. Jungermann, L. Kapusta, F. Katsanevas, S. Katsoufis, E. Kernel, G. Kersevan, B.P. Kerzel, U. King, B.T. Kjaer, N.J. Kluit, P. Kokkinias, P. Kourkoumelis, C. Kouznetsov, O. Krumstein, Z. Kucharczyk, M. Lamsa, J. Leder, G. Ledroit, F. Leinonen, L. Leitner, R. Lemonne, J. Lepeltier, V. Lesiak, T. Liebig, W. Liko, D. Lipniacka, A. Lopes, J.H. Lopez, J.M. Loukas, D. Lutz, P. Lyons, L. MacNaughton, J. Malek, A. Maltezos, S. Mandl, F. Marco, J. Marco, R. Marechal, B. Margoni, M. Marin, J.-C. Mariotti, C. Markou, A. Martinez-Rivero, C. Masik, J. Mastroyiannopoulos, N. Matorras, F. Matteuzzi, C. Mazzucato, F. Mazzucato, M. Mc Nulty, R. Meroni, C. Migliore, E. Mitaroff, W. Mjoernmark, U. Moa, T. Moch, M. Moenig, K. Monge, R. Montenegro, J. Moraes, D. Moreno, S. Morettini, P. Mueller, U. Muenich, K. Mulders, M. Mundim, L. Murray, W. Muryn, B. Myatt, G. Myklebust, T. Nassiakou, M. Navarria, F. Nawrocki, K. Nicolaidou, R. Nikolenko, M. Oblakowska-Mucha, A. Obraztsov, V. Olshevski, A. Onofre, A. Orava, R. Osterberg, K. Ouraou, A. Oyanguren, A. Paganoni, M. Paiano, S. Palacios, J.P. Palka, H. Papadopoulou, T.D. Pape, L. Parkes, C. Parodi, F. Parzefall, U. Passeri, A. Passon, O. Peralta, L. Perepelitsa, V. Perrotta, A. Petrolini, A. Piedra, J. Pieri, L. Pierre, F. Pimenta, M. Piotto, E. Podobnik, T. Poireau, V. Pol, M.E. Polok, G. Pozdniakov, V. Pukhaeva, N. Pullia, A. Rames, J. Read, A. Rebecchi, P. Rehn, J. Reid, D. Reinhardt, R. Renton, P. Richard, F. Ridky, J. Rivero, M. Rodriguez, D. Romero, A. Ronchese, P. Roudeau, P. Rovelli, T. Ruhlmann-Kleider, V. Ryabtchikov, D. Sadovsky, A. Salmi, L. Salt, J. Sander, C. Savoy-Navarro, A. Schwickerath, U. Sekulin, R. Siebel, M. Sisakian, A. Smadja, G. Smirnova, O. Sokolov, A. Sopczak, A. Sosnowski, R. Spassov, T. Stanitzki, M. Stocchi, A. Strauss, J. Stugu, B. Szczekowski, M. Szeptycka, M. Szumlak, T. Tabarelli, T. Tegenfeldt, F. Timmermans, J. Tkatchev, L. Tobin, M. Todorovova, S. Tome, B. Tonazzo, A. Tortosa, P. Travnicek, P. Treille, D. Tristram, G. Trochimczuk, M. Troncon, C. Turluer, M.-L. Tyapkin, I.A. Tyapkin, P. Tzamarias, S. Uvarov, V. Valenti, G. Van Dam, P. Van Eldik, J. Van Remortel, N. Van Vulpen, I. Vegni, G. Veloso, F. Venus, W. Verdier, P. Verzi, V. Vilanova, D. Vitale, L. Vrba, V. Wahlen, H. Washbrook, A.J. Weiser, C. Wicke, D. Wickens, J. Wilkinson, G. Winter, M. Witek, M. Yushchenko, O. Zalewska, A. Zalewski, P. Zavrtanik, D. Zhuravlov, V. Zimin, N.I. Zintchenko, A. Zupan, M.

Subjects
Physics::Instrumentation and Detectors, High Energy Physics::Experiment, Nuclear Experiment
Abstract

Muon bremsstrahlung photons converted in front of the DELPHI main tracker (TPC) in dimuon events at LEP1 were studied in two photon kinematic ranges: 0.2

Published
2008

23. Study of b-quark mass effects in multijet topologies with the DELPHI detector at LEP

Author

Abdallah, J. Abreu, P. Adam, W. Adzic, P. Albrecht, T. Alemany-Fernandez, R. Allmendinger, T. Allport, P.P. Amaldi, U. Amapane, N. Amato, S. Anashkin, E. Andreazza, A. Andringa, S. Anjos, N. Antilogus, P. Apel, W.-D. Arnoud, Y. Ask, S. Asman, B. Augustin, J.E. Augustinus, A. Baillon, P. Ballestrero, A. Bambade, P. Barbier, R. Bardin, D. Barker, G.J. Baroncelli, A. Battaglia, M. Baubillier, M. Becks, K.-H. Begalli, M. Behrmann, A. Ben-Haim, E. Benekos, N. Benvenuti, A. Berat, C. Berggren, M. Bertrand, D. Besancon, M. Besson, N. Bloch, D. Blom, M. Bluj, M. Bonesini, M. Boonekamp, M. Booth, P.S.L. Borisov, G. Botner, O. Bouquet, B. Bowcock, T.J.V. Boyko, I. Bracko, M. Brenner, R. Brodet, E. Bruckman, P. Brunet, J.M. Buschbeck, B. Buschmann, P. Calvi, M. Camporesi, T. Canale, V. Carena, F. Castro, N. Cavallo, F. Chapkin, M. Charpentier, Ph. Checchia, P. Chierici, R. Chliapnikov, P. Chudoba, J. Chung, S.U. Cieslik, K. Collins, P. Contri, R. Cosme, G. Cossutti, F. Costa, M.J. Crennell, D. Cuevas, J. D'Hondt, J. Da Silva, T. Da Silva, W. Della Ricca, G. De Angelis, A. De Boer, W. De Clercq, C. De Lotto, B. De Maria, N. De Min, A. De Paula, L. Di Ciaccio, L. Di Simone, A. Doroba, K. Drees, J. Eigen, G. Ekelof, T. Ellert, M. Elsing, M. Espirito Santo, M.C. Fanourakis, G. Fassouliotis, D. Feindt, M. Fernandez, J. Ferrer, A. Ferro, F. Flagmeyer, U. Foeth, H. Fokitis, E. Fulda-Quenzer, F. Fuster, J. Gandelman, M. Garcia, C. Gavillet, Ph. Gazis, E. Gokieli, R. Golob, B. Gomez-Ceballos, G. Goncalves, P. Graziani, E. Grosdidier, G. Grzelak, K. Guy, J. Haag, C. Hallgren, A. Hamacher, K. Hamilton, K. Haug, S. Hauler, F. Hedberg, V. Hennecke, M. Herr, H. Hoffman, J. Holmgren, S.-O. Holt, P.J. Houlden, M.A. Jackson, J.N. Jarlskog, G. Jarry, P. Jeans, D. Johansson, E.K. Jonsson, P. Joram, C. Jungermann, L. Kapusta, F. Katsanevas, S. Katsoufis, E. Kernel, G. Kersevan, B.P. Kerzel, U. King, B.T. Kjaer, N.J. Kluit, P. Kokkinias, P. Kourkoumelis, C. Kouznetsov, O. Krumstein, Z. Kucharczyk, M. Lamsa, J. Leder, G. Ledroit, F. Leinonen, L. Leitner, R. Lemonne, J. Lepeltier, V. Lesiak, T. Liebig, W. Liko, D. Lipniacka, A. Lopes, J.H. Lopez, J.M. Loukas, D. Lutz, P. Lyons, L. MacNaughton, J. Malek, A. Maltezos, S. Mandl, F. Marco, J. Marco, R. Marechal, B. Margoni, M. Marin, J.-C. Mariotti, C. Markou, A. Martinez-Rivero, C. Masik, J. Mastroyiannopoulos, N. Matorras, F. Matteuzzi, C. Mazzucato, F. Mazzucato, M. Mc Nulty, R. Meroni, C. Migliore, E. Mitaroff, W. Mjoernmark, U. Moa, T. Moch, M. Moenig, K. Monge, R. Montenegro, J. Moraes, D. Moreno, S. Morettini, P. Mueller, U. Muenich, K. Mulders, M. Mundim, L. Murray, W. Muryn, B. Myatt, G. Myklebust, T. Nassiakou, M. Navarria, F. Nawrocki, K. Nicolaidou, R. Nikolenko, M. Oblakowska-Mucha, A. Obraztsov, V. Olshevski, A. Onofre, A. Orava, R. Osterberg, K. Ouraou, A. Oyanguren, A. Paganoni, M. Paiano, S. Palacios, J.P. Palka, H. Papadopoulou, Th.D. Pape, L. Parkes, C. Parodi, F. Parzefall, U. Passeri, A. Passon, O. Peralta, L. Perepelitsa, V. Perrotta, A. Petrolini, A. Piedra, J. Pieri, L. Pierre, F. Pimenta, M. Piotto, E. Podobnik, T. Poireau, V. Pol, M.E. Polok, G. Pozdniakov, V. Pukhaeva, N. Pullia, A. Rames, J. Read, A. Rebecchi, P. Rehn, J. Reid, D. Reinhardt, R. Renton, P. Richard, F. Ridky, J. Rivero, M. Rodriguez, D. Romero, A. Ronchese, P. Roudeau, P. Rovelli, T. Ruhlmann-Kleider, V. Ryabtchikov, D. Sadovsky, A. Salmi, L. Salt, J. Sander, C. Savoy-Navarro, A. Schwickerath, U. Sekulin, R. Siebel, M. Sisakian, A. Smadja, G. Smirnova, O. Sokolov, A. Sopczak, A. Sosnowski, R. Spassov, T. Stanitzki, M. Stocchi, A. Strauss, J. Stugu, B. Szczekowski, M. Szeptycka, M. Szumlak, T. Tabarelli, T. Tegenfeldt, F. Timmermans, J. Tkatchev, L. Tobin, M. Todorovova, S. Tome, B. Tonazzo, A. Tortosa, P. Travnicek, P. Treille, D. Tristram, G. Trochimczuk, M. Troncon, C. Turluer, M.-L. Tyapkin, I.A. Tyapkin, P. Tzamarias, S. Uvarov, V. Valenti, G. Van Dam, P. Van Eldik, J. Van Remortel, N. Van Vulpen, I. Vegni, G. Veloso, F. Venus, W. Verdier, P. Verzi, V. Vilanova, D. Vitale, L. Vrba, V. Wahlen, H. Washbrook, A.J. Weiser, C. Wicke, D. Wickens, J. Wilkinson, G. Winter, M. Witek, M. Yushchenko, O. Zalewska, A. Zalewski, P. Zavrtanik, D. Zhuravlov, V. Zimin, N.I. Zintchenko, A. Zupan, M.

Subjects
High Energy Physics::Phenomenology, High Energy Physics::Experiment
Abstract

The effect of the heavy b-quark mass on the two, three and four-jet rates is studied using LEP data collected by the DELPHI experiment at the Z peak in 1994 and 1995. The rates of b-quark jets and light quark jets (ℓ = uds) in events with n=2, 3, and 4 jets, together with the ratio of two and four-jet rates of b-quarks with respect to light-quarks, Rn bℓ, have been measured with a double-tag technique using the CAMBRIDGE jet-clustering algorithm. A comparison between experimental results and theory (matrix element or Monte Carlo event generators such as PYTHIA, HERWIG and ARIADNE) is done after the hadronisation phase. Using the four-jet observable R4 bℓ, a measurement of the b-quark mass using massive leading-order calculations gives: mb(MZ)=3.76±0. 32(stat)±0.17(syst)±0.22(had)±0.90(theo)GeV/c2. This result is compatible with previous three-jet determinations at the M Z energy scale and with low energy mass measurements evolved to the MZ scale using QCD renormalisation group equations. © 2008 Springer-Verlag / Società Italiana di Fisica.

Published
2008

24. Study of W-boson polarisations and triple gauge boson couplings in the reaction e(+)e(-)-> W+W- at LEP 2

Author

Abdallah, J. Abreu, P. Adam, W. Adzic, P. Albrecht, T. and Alemany-Fernandez, R. Allmendinger, T. Allport, P. P. and Amaldi, U. Amapane, N. Amato, S. Anashkin, E. Andreazza, A. Andringa, S. Anjos, N. Antilogus, P. Apel, W. -D. and Arnoud, Y. Ask, S. Asman, B. Augustin, J. E. Augustinus, A. Baillon, P. Ballestrero, A. Bambade, P. Barbier, R. and Bardin, D. Barker, G. J. Baroncelli, A. Battaglia, M. and Baubillier, M. Becks, K-H. Begalli, M. Behrmann, A. and Ben-Haim, E. Benekos, N. Benvenuti, A. Berat, C. and Berggren, M. Bertrand, D. Besancon, M. Besson, N. Bloch, D. Blom, M. Bluj, M. Bonesini, M. Boonekamp, M. and Booth, P. S. L. Borisov, G. Botner, O. Bouquet, B. and Bowcock, T. J. V. Boyko, I. Bracko, M. Brenner, R. and Brodet, E. Bruckman, P. Brunet, J. M. Buschbeck, B. and Buschmann, P. Calvi, M. Camporesi, T. Canale, V. Carena, F. Castro, N. Cavallo, F. Chapkin, M. Charpentier, Ph. and Checchia, P. Chierici, R. Chliapnikov, P. Chudoba, J. and Chung, S. U. Cieslik, K. Collins, P. Contri, R. and Cosme, G. Cossutti, F. Costa, M. J. Crennell, D. Cuevas, J. D'Hondt, J. da Silva, T. Da Silva, W. Della Ricca, G. and De Angelis, A. De Boer, W. De Clercq, C. De Lotto, B. and De Maria, N. De Min, A. De Paula, L. Di Ciaccio, L. and Di Simone, A. Doroba, K. Drees, J. Eigen, G. Ekelof, T. and Ellert, M. Elsing, M. Santo, M. C. Espirito Fanourakis, G. Fassouliotis, D. Feindt, M. Fernandez, J. Ferrer, A. and Ferro, F. Flagmeyer, U. Foeth, H. Fokitis, E. and Fulda-Quenzer, F. Fuster, J. Gandelman, M. Garcia, C. and Gavillet, Ph. Gazis, E. Gokieli, R. Golob, B. and Gomez-Ceballos, G. Goncalves, P. Graziani, E. Grosdidier, G. and Grzelak, K. Guy, J. Haag, C. Hallgren, A. Hamacher, K. Hamilton, K. Haug, S. Hauler, F. Hedberg, V. and Hennecke, M. Hoffman, J. . Holmgren, S-O. Holt, P. J. and Houlden, M. A. Jackson, J. N. Jarlskog, G. Jarry, P. and Jeans, D. Johansson, E. K. Jonsson, P. Joram, C. and Jungermann, L. Kapusta, F. Katsanevas, S. Katsoufis, E. and Kernel, G. Kersevan, B. P. Kerzel, U. King, B. T. Kjaer, N. J. Kluit, P. Kokkinias, P. Kourkoumelis, C. and Kouznetsov, O. Krumstein, Z. Kucharczyk, M. Lamsa, J. and Leder, G. Ledroit, F. Leinonen, L. Leitner, R. Lemonne, J. Lepeltier, V. Lesiak, T. Liebig, W. Liko, D. and Lipniacka, A. Lopes, J. H. Lopez, J. M. Loukas, D. Lutz, P. Lyons, L. MacNaughton, J. Malek, A. Maltezos, S. and Mandl, F. Marco, J. Marco, R. Marechal, B. Margoni, M. and Marin, J-C. Mariotti, C. Markou, A. Martinez-Rivero, C. and Masik, J. Mastroyiannopoulos, N. Matorras, F. Matteuzzi, C. Mazzucato, F. Mazzucato, M. Mc Nulty, R. Meroni, C. and Migliore, E. Mitaroff, W. Mjoernmark, U. Moa, T. and Moch, M. Moenig, K. Monge, R. Montenegro, J. Moraes, D. and Moreno, S. Morettini, P. Mueller, U. Muenich, K. and Mulders, M. Mundim, L. Murray, W. Muryn, B. Myatt, G. and Myklebust, T. Nassiakou, M. Navarria, F. Nawrocki, K. and Nicolaidou, R. Nikolenko, M. Oblakowska-Mucha, A. and Obraztsov, V. Olshevski, A. Onofre, A. Orava, R. and Osterberg, K. Ouraou, A. Oyanguren, A. Paganoni, M. and Paiano, S. Palacios, J. P. Palka, H. Papadopoulou, Th. D. and Pape, L. Parkes, C. Parodi, F. Parzefall, U. and Passeri, A. Passon, O. Peralta, L. Perepelitsa, V. and Perrotta, A. Petrolini, A. Piedra, J. Pieri, L. Pierre, F. Pimenta, M. Piotto, E. Podobnik, T. Poireau, V. and Pol, M. E. Polok, G. Pozdniakov, V. Pukhaeva, N. Pullia, A. Radojicic, D. Rames, J. Read, A. Rebecchi, P. and Rehn, J. Reid, D. Reinhardt, R. Renton, P. Richard, F. and Ridky, J. Rivero, M. Rodriguez, D. Romero, A. and Ronchese, P. Roudeau, P. Rovelli, T. Ruhlmann-Kleider, V. and Ryabtchikov, D. Sadovsky, A. Salmi, L. Salt, J. and Sander, C. Savoy-Navarro, A. Schwickerath, U. Sekulin, R. and Siebel, M. Sisakian, A. Smadja, G. Smirnova, O. and Sokolov, A. Sopczak, A. Sosnowski, R. Spassov, T. and Stanitzki, M. Stocchi, A. Strauss, J. Stugu, B. and Szczekowski, M. Szeptycka, M. Szumlak, T. Tabarelli, T. and Tegenfeldt, F. Timmermans, J. Tkatchev, L. Tobin, M. and Todorovova, S. Tome, B. Tonazzo, A. Tortosa, P. and Travnicek, P. Treille, D. Tristram, G. Trochimczuk, M. and Troncon, C. . Turluer, M-L. Tyapkin, I. A. Tyapkin, P. and Tzamarias, S. Uvarov, V. Valenti, G. Van Dam, P. Van Eldik, J. Van Lysebetten, A. Van Remortel, N. Van Vulpen, I. and Vegni, G. Veloso, F. Venus, W. Verdier, P. Verzi, V. and Vilanova, D. Vitale, L. Vrba, V. Wahlen, H. and Washbrook, A. J. Weiser, C. Wicke, D. Wickens, J. and Wilkinson, G. Winter, M. Witek, M. Yushchenko, O. and Zalewska, A. Zalewski, P. Zavrtanik, D. Zhuravlov, V. and Zimin, N. I. Zintchenko, A. Zupan, M. Collaboration, D

Subjects
High Energy Physics::Experiment
Abstract

A determination of the single W spin density matrix (SDM) elements in the reaction e(+)e(-) -> W+W–> l nu q (q) over bar (l=e/mu) is reported at centre-of-mass energies between 189 and 209GeV. The data sample used corresponds to an integrated luminosity of 520pb(-1) taken by DELPHI between 1998 and 2000. The single W SDM elements, rho(W +/-)(tau tau’) (tau,tau’=+/- 1 or 0), are determined as a function of the W- production angle with respect to the e(-) beam direction and are obtained from measurements of the W decay products by the application of suitable projection operators, Lambda(tau tau’), which assume the V-A coupling of the W-boson to fermions. The measured SDM elements are used to obtain the fraction of longitudinally polarised Ws, with the result: sigma(L)/sigma(tot) = 24.9 +/- 4.5 (stat) +/- 2.2 (syst)% at a mean energy of 198 GeV. The SDM elements are also used to determine the triple gauge couplings Delta g(1)(Z), Delta kappa(gamma), lambda(gamma) and g(4)(Z), (kappa) over tilde (Z) and (lambda) over tilde (Z). For the CP-violating couplings the results of single parameter fits are: g(4)(Z) = -0.39(-0.20)(+0.19) (kappa) over tilde (Z) = -0.09(-0.05)(+0.08) (lambda) over tilde (Z) = -0.08 +/- 0.07. The errors are a combination of statistical and systematic errors. All results are consistent with the Standard Model.

Published
2008

25. Measurement of the mass and width of the W boson in e(+) e(-) collisions at root s=161-209 GeV

Author

Abdallah, J. Abreu, P. Adam, W. Adzic, P. Albrecht, T. and Alemany-Fernandez, R. Allmendinger, T. Allport, P. P. and Amaldi, U. Amapane, N. Amato, S. Anashkin, E. Andreazza, A. Andringa, S. Anjos, N. Antilogus, P. Apel, W-D. and Arnoud, Y. Ask, S. Asman, B. Augustin, J. E. Augustinus, A. Baillon, P. Ballestrero, A. Bambade, P. Barbier, R. and Bardin, D. Barker, G. J. Baroncelli, A. Battaglia, M. and Baubillier, M. Becks, K-H. Begalli, M. Behrmann, A. and Ben-Haim, E. Benekos, N. Benvenuti, A. Berat, C. and Berggren, M. Bertrand, D. Besancon, M. Besson, N. Bloch, D. Blom, M. Bluj, M. Bonesini, M. Boonekamp, M. and Booth, P. S. L. Borisov, G. Botner, O. Bouquet, B. and Bowcock, T. J. V. Boyko, I. Bracko, M. Brenner, R. and Brodet, E. Bruckman, P. Brunet, J. M. Buschbeck, B. and Buschmann, P. Calvi, M. Camporesi, T. Canale, V. Carena, F. Castro, N. Cavallo, F. Chapkin, M. Charpentier, Ph. and Checchia, P. Chierici, R. Chliapnikov, P. Chudoba, J. and Chung, S. U. Cieslik, K. Collins, P. Contri, R. and Cosme, G. Cossutti, F. Costa, M. J. Crennell, D. Cuevas, J. D'Hondt, J. da Silva, T. da Silva, W. Della Ricca, G. and De Angelis, A. De Boer, W. De Clercq, C. De Lotto, B. and De Maria, N. De Min, A. de Paula, L. Di Ciaccio, L. and Di Simone, A. Doroba, K. Drees, J. Duperrin, A. Eigen, G. Ekelof, T. Ellert, M. Elsing, M. Santo, C. Espirito and Fanourakis, G. Fassouliotis, D. Feindt, M. Fernandez, J. and Ferrer, A. Ferro, F. Flagmeyer, U. Foeth, H. and Fokitis, E. Fulda-Quenzer, F. Fuster, J. Gandelman, M. and Garcia, C. Gavillet, Ph. Gazis, E. Gokieli, R. Golob, B. and Gomez-Ceballos, G. Goncalves, P. Graziani, E. and Grosdidier, G. Grzelak, K. Guy, J. Haag, C. Hallgren, A. and Hamacher, K. Hamilton, K. Haug, S. Hauler, F. and Hedberg, V. Hennecke, M. Hoffman, J. Holmgren, S-O. and Holt, P. J. Houlden, M. A. Jackson, J. N. Jarlskog, G. and Jarry, P. Jeans, D. Johansson, E. K. Jonsson, P. Joram, C. Jungermann, L. Kapusta, F. Katsanevas, S. Katsoufis, E. Kernel, G. Kersevan, B. P. Kerzel, U. King, B. T. and Kjaer, N. J. Kluit, P. Kokkinias, P. Kourkoumelis, C. and Kouznetsov, O. Krumstein, Z. Kucharczyk, M. Lamsa, J. and Leder, G. Ledroit, F. Leinonen, L. Leitner, R. Lemonne, J. Lepeltier, V. Lesiak, T. Liebig, W. Liko, D. and Lipniacka, A. Lopes, J. H. Lopez, J. M. Loukas, D. Lutz, P. Lyons, L. MacNaughton, J. Malek, A. Maltezos, S. and Mandl, F. Marco, J. Marco, R. Marechal, B. Margoni, M. and Marin, J-C. Mariotti, C. Markou, A. Martinez-Rivero, C. and Masik, J. Mastroyiannopoulos, N. Matorras, F. Matteuzzi, C. Mazzucato, F. Mazzucato, M. McNulty, R. Meroni, C. and Migliore, E. Mitaroff, W. Mjoernmark, U. Moa, T. and Moch, M. Moenig, K. Monge, R. Montenegro, J. Moraes, D. and Moreno, S. Morettini, P. Mueller, U. Muenich, K. and Mulders, M. Mundim, L. Murray, W. Muryn, B. Myatt, G. and Myklebust, T. Nassiakou, M. Navarria, F. Nawrocki, K. and Nicolaidou, R. Nikolenko, M. Oblakowska-Mucha, A. and Obraztsov, V. Olshevski, A. Onofre, A. Orava, R. and Osterberg, K. Ouraou, A. Oyanguren, A. Paganoni, M. and Paiano, S. Palacios, J. P. Palka, H. Papadopoulou, Th. D. and Pape, L. Parkes, C. Parodi, F. Parzefall, U. and Passeri, A. Passon, O. Peralta, L. Perepelitsa, V. and Perrotta, A. Petrolini, A. Piedra, J. Pieri, L. Pierre, F. Pimenta, M. Piotto, E. Podobnik, T. Poireau, V. and Pol, M. E. Polok, G. Pozdniakov, V. Pukhaeva, N. Pullia, A. Radojicic, D. Rames, J. Read, A. Rebecchi, P. and Rehn, J. Reid, D. Reinhardt, R. Renton, P. Richard, F. and Ridky, J. Rivero, M. Rodriguez, D. Romero, A. and Ronchese, P. Roudeau, P. Rovelli, T. Ruhlmann-Kleider, V. and Ryabtchikov, D. Sadovsky, A. Salmi, L. Salt, J. and Sander, C. Savoy-Navarro, A. Schwickerath, U. Sekulin, R. and Siebel, M. Simard, L. Sisakian, A. Smadja, G. and Smirnova, O. Sokolov, A. Sopczak, A. Sosnowski, R. and Spassov, T. Stanitzki, M. Stocchi, A. Strauss, J. Stugu, B. Szczekowski, M. Szeptycka, M. Szumlak, T. Tabarelli, T. Tegenfeldt, F. Thomas, J. Timmermans, J. Tkatchev, L. and Tobin, M. Todorovova, S. Tome, B. Tonazzo, A. and Tortosa, P. Travnicek, P. Treille, D. Tristram, G. and Trochimczuk, M. Troncon, C. Turluer, M-L. Tyapkin, I. A. and Tyapkin, P. Tzamarias, S. Uvarov, V. Valenti, G. Van Dam, P. Van Eldik, J. Van Remortel, N. Van Vulpen, I. and Vegni, G. Veloso, F. Venus, W. Verdier, P. Verzi, V. and Vilanova, D. Vitale, L. Vrba, V. Wahlen, H. Washbrook, A. J. Weiser, C. Wicke, D. Wickens, J. Wilkinson, G. and Winter, M. Witek, M. Yushchenko, O. Zalewska, A. and Zalewski, P. Zavrtanik, D. Zhuravlov, V. Zimin, N. I. and Zintchenko, A. Zupan, M. DELPHI Collaboration

Subjects
High Energy Physics::Experiment, Nuclear Experiment
Abstract

A measurement of the W boson mass and width has been performed by the DELPHI collaboration using the data collected during the full LEP2 programme (1996-2000). The data sample has an integrated luminosity of 660 pb(-1) and was collected over a range of centre-of-mass energies from 161 to 209 GeV. Results are obtained by applying the method of direct reconstruction of the mass of the W from its decay products in both the W+W- -> l (nu) over bar (l) and W+W- -> q (q) over bar’(q) over barq’channels. The W mass result for the combined data set is M-W = 80.336 +/- 0.055(Stat.) +/- 0.028(Syst.) +/- 0.025(FSI) +/- 0.009(LEP) GeV/c(2) , where FSI represents the uncertainty due to final state interaction effects in the q (q) over bar’(q) over barq’ channel, and LEP represents that arising from the knowledge of the collision energy of the accelerator. The combined value for the W width is Gamma(W) = 2.404 +/- 0.140(Stat.) +/- 0.077(Syst.) +/- 0.065(FSI) GeV/c(2). These results supersede all values previously published by the DELPHI collaboration.

Published
2008

26. Higgs boson searches in CP-conserving and CP-violating MSSM scenarios with the DELPHI detector (The European Physical Journal C (2008) 56 (1-16) DOI:10.1140/epjc/s10052-007-0506-1)

Author

Abdallah, J. Abreu, P. Adam, W. Adzic, P. Albrecht, T. Alemany-Fernandez, R. Allmendinger, T. Allport, P.P. Amaldi, U. Amapane, N. Amato, S. Anashkin, E. Andreazza, A. Andringa, S. Anjos, N. Antilogus, P. Apel, W.-D. Arnoud, Y. Ask, S. Asman, B. Augustin, J.E. Augustinus, A. Baillon, P. Ballestrero, A. Bambade, P. Barbier, R. Bardin, D. Barker, G.J. Baroncelli, A. Battaglia, M. Baubillier, M. Becks, K.-H. Begalli, M. Behrmann, A. Ben-Haim, E. Benekos, N. Benvenuti, A. Berat, C. Berggren, M. Berntzon, L. Bertrand, D. Besancon, M. Besson, N. Bloch, D. Blom, M. Bluj, M. Bonesini, M. Boonekamp, M. Booth, P.S.L. Borisov, G. Botner, O. Bouquet, B. Bowcock, T.J.V. Boyko, I. Bracko, M. Brenner, R. Brodet, E. Bruckman, P. Brunet, J.M. Buschbeck, B. Buschmann, P. Calvi, M. Camporesi, T. Canale, V. Carena, F. Castro, N. Cavallo, F. Chapkin, M. Charpentier, Ph. Checchia, P. Chierici, R. Chliapnikov, P. Chudoba, J. Chung, S.U. Cieslik, K. Collins, P. Contri, R. Cosme, G. Cossutti, F. Costa, M.J. Crennell, D. Cuevas, J. D'Hondt, J. Dalmau, J. Da Silva, T. Da Silva, W. Della Ricca, G. De Angelis, A. De Boer, W. De Clercq, C. De Lotto, B. De Maria, N. De Min, A. De Paula, L. Di Ciaccio, L. Di Simone, A. Doroba, K. Drees, J. Eigen, G. Ekelof, T. Ellert, M. Elsing, M. Espirito Santo, M.C. Fanourakis, G. Fassouliotis, D. Feindt, M. Fernandez, J. Ferrer, A. Ferro, F. Flagmeyer, U. Foeth, H. Fokitis, E. Fulda-Quenzer, F. Fuster, J. Gandelman, M. Garcia, C. Gavillet, Ph. Gazis, E. Gokieli, R. Golob, B. Gomez-Ceballos, G. Goncalves, P. Graziani, E. Grosdidier, G. Grzelak, K. Guy, J. Haag, C. Hallgren, A. Hamacher, K. Hamilton, K. Haug, S. Hauler, F. Hedberg, V. Hennecke, M. Herr, H. Hoffman, J. Holmgren, S.-O. Holt, P.J. Houlden, M.A. Jackson, J.N. Jarlskog, G. Jarry, P. Jeans, D. Johansson, E.K. Johansson, P.D. Jonsson, P. Joram, C. Jungermann, L. Kapusta, F. Katsanevas, S. Katsoufis, E. Kernel, G. Kersevan, B.P. Kerzel, U. King, B.T. Kjaer, N.J. Kluit, P. Kokkinias, P. Kourkoumelis, C. Kouznetsov, O. Krumstein, Z. Kucharczyk, M. Lamsa, J. Leder, G. Ledroit, F. Leinonen, L. Leitner, R. Lemonne, J. Lepeltier, V. Lesiak, T. Liebig, W. Liko, D. Lipniacka, A. Lopes, J.H. Lopez, J.M. Loukas, D. Lutz, P. Lyons, L. MacNaughton, J. Malek, A. Maltezos, S. Mandl, F. Marco, J. Marco, R. Marechal, B. Margoni, M. Marin, J.-C. Mariotti, C. Markou, A. Martinez-Rivero, C. Masik, J. Mastroyiannopoulos, N. Matorras, F. Matteuzzi, C. Mazzucato, F. Mazzucato, M. Mc Nulty, R. Meroni, C. Migliore, E. Mitaroff, W. Mjoernmark, U. Moa, T. Moch, M. Moenig, K. Monge, R. Montenegro, J. Moraes, D. Moreno, S. Morettini, P. Mueller, U. Muenich, K. Mulders, M. Mundim, L. Murray, W. Muryn, B. Myatt, G. Myklebust, T. Nassiakou, M. Navarria, F. Nawrocki, K. Nicolaidou, R. Nikolenko, M. Oblakowska-Mucha, A. Obraztsov, V. Olshevski, A. Onofre, A. Orava, R. Osterberg, K. Ouraou, A. Oyanguren, A. Paganoni, M. Paiano, S. Palacios, J.P. Palka, H. Papadopoulou, Th.D. Pape, L. Parkes, C. Parodi, F. Parzefall, U. Passeri, A. Passon, O. Peralta, L. Perepelitsa, V. Perrotta, A. Petrolini, A. Piedra, J. Pieri, L. Pierre, F. Pimenta, M. Piotto, E. Podobnik, T. Poireau, V. Pol, M.E. Polok, G. Pozdniakov, V. Pukhaeva, N. Pullia, A. Rames, J. Read, A. Rebecchi, P. Rehn, J. Reid, D. Reinhardt, R. Renton, P. Richard, F. Ridky, J. Rivero, M. Rodriguez, D. Romero, A. Ronchese, P. Roudeau, P. Rovelli, T. Ruhlmann-Kleider, V. Ryabtchikov, D. Sadovsky, A. Salmi, L. Salt, J. Sander, C. Savoy-Navarro, A. Schwickerath, U. Sekulin, R. Siebel, M. Sisakian, A. Smadja, G. Smirnova, O. Sokolov, A. Sopczak, A. Sosnowski, R. Spassov, T. Stanitzki, M. Stocchi, A. Strauss, J. Stugu, B. Szczekowski, M. Szeptycka, M. Szumlak, T. Tabarelli, T. Taffard, A.C. Tegenfeldt, F. Timmermans, J. Tkatchev, L. Tobin, M. Todorovova, S. Tome, B. Tonazzo, A. Tortosa, P. Travnicek, P. Treille, D. Tristram, G. Trochimczuk, M. Troncon, C. Turluer, M.-L. Tyapkin, I.A. Tyapkin, P. Tzamarias, S. Uvarov, V. Valenti, G. Van Dam, P. Van Eldik, J. Van Remortel, N. Van Vulpen, I. Vegni, G. Veloso, F. Venus, W. Verdier, P. Verzi, V. Vilanova, D. Vitale, L. Vrba, V. Wahlen, H. Washbrook, A.J. Weiser, C. Wicke, D. Wickens, J. Wilkinson, G. Winter, M. Witek, M. Yushchenko, O. Zalewska, A. Zalewski, P. Zavrtanik, D. Zhuravlov, V. Zimin, N.I. Zintchenko, A. Zupan, M.

Published
2008

27. Measurement of the tau lepton polarisation at LEP2

Author

Abdallah, J. Abreu, P. Adam, W. Adzic, P. Albrecht, T. Alemany-Fernandez, R. Allmendinger, T. Allport, P.P. Amaldi, U. Amapane, N. Amato, S. Anashkin, E. Andreazza, A. Andringa, S. Anjos, N. Antilogus, P. Apel, W.-D. Arnoud, Y. Ask, S. Asman, B. Augustin, J.E. Augustinus, A. Baillon, P. Ballestrero, A. Bambade, P. Barbier, R. Bardin, D. Barker, G.J. Baroncelli, A. Battaglia, M. Baubillier, M. Becks, K.-H. Begalli, M. Behrmann, A. Ben-Haim, E. Benekos, N. Benvenuti, A. Berat, C. Berggren, M. Bertrand, D. Besancon, M. Besson, N. Bloch, D. Blom, M. Bluj, M. Bonesini, M. Boonekamp, M. Booth, P.S.L. Borisov, G. Botner, O. Bouquet, B. Bowcock, T.J.V. Boyko, I. Bracko, M. Brenner, R. Brodet, E. Bruckman, P. Brunet, J.M. Buschbeck, B. Buschmann, P. Calvi, M. Camporesi, T. Canale, V. Carena, F. Castro, N. Cavallo, F. Chapkin, M. Charpentier, Ph. Checchia, P. Chierici, R. Chliapnikov, P. Chudoba, J. Chung, S.U. Cieslik, K. Collins, P. Contri, R. Cosme, G. Cossutti, F. Costa, M.J. Crennell, D. Cuevas, J. D'Hondt, J. da Silva, T. Da Silva, W. Dedovich, D. Ricca, G.D. De Angelis, A. De Boer, W. De Clercq, C. De Lotto, B. De Maria, N. De Min, A. de Paula, L. Di Ciaccio, L. Di Simone, A. Doroba, K. Drees, J. Eigen, G. Ekelof, T. Ellert, M. Elsing, M. Santo, M.C.E. Fanourakis, G. Fassouliotis, D. Feindt, M. Fernandez, J. Ferrer, A. Ferro, F. Flagmeyer, U. Foeth, H. Fokitis, E. Fulda-Quenzer, F. Fuster, J. Gandelman, M. Garcia, C. Gavillet, Ph. Gazis, E. Gokieli, R. Golob, B. Gomez-Ceballos, G. Goncalves, P. Graziani, E. Grosdidier, G. Grzelak, K. Guy, J. Haag, C. Hallgren, A. Hamacher, K. Hamilton, K. Haug, S. Hauler, F. Hedberg, V. Hennecke, M. Herr, H. Hoffman, J. Holmgren, S.-O. Holt, P.J. Houlden, M.A. Jackson, J.N. Jarlskog, G. Jarry, P. Jeans, D. Johansson, E.K. Jonsson, P. Joram, C. Jungermann, L. Kapusta, F. Katsanevas, S. Katsoufis, E. Kernel, G. Kersevan, B.P. Kerzel, U. King, B.T. Kjaer, N.J. Kluit, P. Kokkinias, P. Kourkoumelis, C. Kouznetsov, O. Krumstein, Z. Kucharczyk, M. Lamsa, J. Leder, G. Ledroit, F. Leinonen, L. Leitner, R. Lemonne, J. Lepeltier, V. Lesiak, T. Liebig, W. Liko, D. Lipniacka, A. Lopes, J.H. Lopez, J.M. Loukas, D. Lutz, P. Lyons, L. MacNaughton, J. Malek, A. Maltezos, S. Mandl, F. Marco, J. Marco, R. Marechal, B. Margoni, M. Marin, J.-C. Mariotti, C. Markou, A. Martinez-Rivero, C. Masik, J. Mastroyiannopoulos, N. Matorras, F. Matteuzzi, C. Mazzucato, F. Mazzucato, M. Nulty, R.M. Meroni, C. Migliore, E. Mitaroff, W. Mjoernmark, U. Moa, T. Moch, M. Moenig, K. Monge, R. Montenegro, J. Moraes, D. Moreno, S. Morettini, P. Mueller, U. Muenich, K. Mulders, M. Mundim, L. Murray, W. Muryn, B. Myatt, G. Myklebust, T. Nassiakou, M. Navarria, F. Nawrocki, K. Nicolaidou, R. Nikolenko, M. Oblakowska-Mucha, A. Obraztsov, V. Olshevski, A. Onofre, A. Orava, R. Osterberg, K. Ouraou, A. Oyanguren, A. Paganoni, M. Paiano, S. Palacios, J.P. Palka, H. Papadopoulou, Th.D. Pape, L. Parkes, C. Parodi, F. Parzefall, U. Passeri, A. Passon, O. Peralta, L. Perepelitsa, V. Perrotta, A. Petrolini, A. Piedra, J. Pieri, L. Pierre, F. Pimenta, M. Piotto, E. Podobnik, T. Poireau, V. Pol, M.E. Polok, G. Pozdniakov, V. Pukhaeva, N. Pullia, A. Rames, J. Read, A. Rebecchi, P. Rehn, J. Reid, D. Reinhardt, R. Renton, P. Richard, F. Ridky, J. Rivero, M. Rodriguez, D. Romero, A. Ronchese, P. Roudeau, P. Rovelli, T. Ruhlmann-Kleider, V. Ryabtchikov, D. Sadovsky, A. Salmi, L. Salt, J. Sander, C. Savoy-Navarro, A. Schwickerath, U. Sekulin, R. Siebel, M. Sisakian, A. Smadja, G. Smirnova, O. Sokolov, A. Sopczak, A. Sosnowski, R. Spassov, T. Stanitzki, M. Stocchi, A. Strauss, J. Stugu, B. Szczekowski, M. Szeptycka, M. Szumlak, T. Tabarelli, T. Tegenfeldt, F. Timmermans, J. Tkatchev, L. Tobin, M. Todorovova, S. Tome, B. Tonazzo, A. Tortosa, P. Travnicek, P. Treille, D. Tristram, G. Trochimczuk, M. Troncon, C. Turluer, M.-L. Tyapkin, I.A. Tyapkin, P. Tzamarias, S. Uvarov, V. Valenti, G. Van Dam, P. Van Eldik, J. van Remortel, N. Van Vulpen, I. Vegni, G. Veloso, F. Venus, W. Verdier, P. Verzi, V. Vilanova, D. Vitale, L. Vrba, V. Wahlen, H. Washbrook, A.J. Weiser, C. Wicke, D. Wickens, J. Wilkinson, G. Winter, M. Witek, M. Yushchenko, O. Zalewska, A. Zalewski, P. Zavrtanik, D. Zhuravlov, V. Zimin, N.I. Zintchenko, A. Zupan, M.

Subjects
High Energy Physics::Phenomenology, High Energy Physics::Experiment
Abstract

A first measurement of the average polarisation Pτ of tau leptons produced in e+e- annihilation at energies significantly above the Z resonance is presented. The polarisation is determined from the kinematic spectra of tau hadronic decays. The measured value Pτ = - 0.164 ± 0.125 is consistent with the Standard Model prediction for the mean LEP energy of 197 GeV. © 2007 Elsevier B.V. All rights reserved.

Published
2008

28. Di-jet production in γ γ collisions at LEP2

Author

Abdallah, J. Abreu, P. Adam, W. Adzic, P. Albrecht, T. Alemany-Fernandez, R. Allmendinger, T. Allport, P.P. Amaldi, U. Amapane, N. Amato, S. Anashkin, E. Andreazza, A. Andringa, S. Anjos, N. Antilogus, P. Apel, W.-D. Arnoud, Y. Ask, S. Asman, B. Augustin, J.E. Augustinus, A. Baillon, P. Ballestrero, A. Bambade, P. Barbier, R. Bardin, D. Barker, G.J. Baroncelli, A. Battaglia, M. Baubillier, M. Becks, K.-H. Begalli, M. Behrmann, A. Ben-Haim, E. Benekos, N. Benvenuti, A. Berat, C. Berggren, M. Bertrand, D. Besancon, M. Besson, N. Bloch, D. Blom, M. Bluj, M. Bonesini, M. Boonekamp, M. Booth, P.S.L. Borisov, G. Botner, O. Bouquet, B. Bowcock, T.J.V. Boyko, I. Bracko, M. Brenner, R. Brodet, E. Bruckman, P. Brunet, J.M. Buschbeck, B. Buschmann, P. Calvi, M. Camporesi, T. Canale, V. Carena, F. Castro, N. Cavallo, F. Chapkin, M. Charpentier, Ph. Checchia, P. Chierici, R. Chliapnikov, P. Chudoba, J. Chung, S.U. Cieslik, K. Collins, P. Contri, R. Cosme, G. Cossutti, F. Costa, M.J. Crennell, D. Cuevas, J. D'Hondt, J. Da Silva, T. Da Silva, W. Della Ricca, G. De Angelis, A. De Boer, W. De Clercq, C. De Lotto, B. De Maria, N. De Min, A. De Paula, L. Di Ciaccio, L. Di Simone, A. Doroba, K. Drees, J. Eigen, G. Ekelof, T. Ellert, M. Elsing, M. Espirito Santo, M.C. Fanourakis, G. Fassouliotis, D. Feindt, M. Fernandez, J. Ferrer, A. Ferro, F. Flagmeyer, U. Foeth, H. Fokitis, E. Fulda-Quenzer, F. Fuster, J. Gandelman, M. Garcia, C. Gavillet, P. Gazis, E. Gokieli, R. Golob, B. Gomez-Ceballos, G. Goncalves, P. Graziani, E. Grosdidier, G. Grzelak, K. Guy, J. Haag, C. Hallgren, A. Hamacher, K. Hamilton, K. Haug, S. Hauler, F. Hedberg, V. Hennecke, M. Hoffman, J. Holmgren, S.-O. Holt, P.J. Houlden, M.A. Jackson, J.N. Jarlskog, G. Jarry, P. Jeans, D. Johansson, E.K. Jonsson, P. Joram, C. Jungermann, L. Kapusta, F. Katsanevas, S. Katsoufis, E. Kernel, G. Kersevan, B.P. Kerzel, U. King, B.T. Kjaer, N.J. Kluit, P. Kokkinias, P. Kourkoumelis, C. Kouznetsov, O. Krumstein, Z. Kucharczyk, M. Lamsa, J. Leder, G. Ledroit, F. Leinonen, L. Leitner, R. Lemonne, J. Lepeltier, V. Lesiak, T. Liebig, W. Liko, D. Lipniacka, A. Lopes, J.H. Lopez, J.M. Loukas, D. Lutz, P. Lyons, L. MacNaughton, J. Malek, A. Maltezos, S. Mandl, F. Marco, J. Marco, R. Marechal, B. Margoni, M. Marin, J.-C. Mariotti, C. Markou, A. Martinez-Rivero, C. Masik, J. Mastroyiannopoulos, N. Matorras, F. Matteuzzi, C. Mazzucato, F. Mazzucato, M. Mc Nulty, R. Meroni, C. Migliore, E. Mitaroff, W. Mjoernmark, U. Moa, T. Moch, M. Moenig, K. Monge, R. Montenegro, J. Moraes, D. Moreno, S. Morettini, P. Mueller, U. Muenich, K. Mulders, M. Mundim, L. Murray, W. Muryn, B. Myatt, G. Myklebust, T. Nassiakou, M. Navarria, F. Nawrocki, K. Nemecek, S. Nicolaidou, R. Nikolenko, M. Oblakowska-Mucha, A. Obraztsov, V. Olshevski, A. Onofre, A. Orava, R. Osterberg, K. Ouraou, A. Oyanguren, A. Paganoni, M. Paiano, S. Palacios, J.P. Palka, H. Papadopoulou, Th.D. Pape, L. Parkes, C. Parodi, F. Parzefall, U. Passeri, A. Passon, O. Peralta, L. Perepelitsa, V. Perrotta, A. Petrolini, A. Piedra, J. Pieri, L. Pierre, F. Pimenta, M. Piotto, E. Podobnik, T. Poireau, V. Pol, M.E. Polok, G. Pozdniakov, V. Pukhaeva, N. Pullia, A. Radojicic, D. Rebecchi, P. Rehn, J. Reid, D. Reinhardt, R. Renton, P. Richard, F. Ridky, J. Rivero, M. Rodriguez, D. Romero, A. Ronchese, P. Roudeau, P. Rovelli, T. Ruhlmann-Kleider, V. Ryabtchikov, D. Sadovsky, A. Salmi, L. Salt, J. Sander, C. Savoy-Navarro, A. Schwickerath, U. Sekulin, R. Siebel, M. Sisakian, A. Smadja, G. Smirnova, O. Sokolov, A. Sopczak, A. Sosnowski, R. Spassov, T. Stanitzki, M. Stocchi, A. Strauss, J. Stugu, B. Szczekowski, M. Szeptycka, M. Szumlak, T. Tabarelli, T. Tegenfeldt, F. Timmermans, J. Tkatchev, L. Tobin, M. Todorovova, S. Tome, B. Tonazzo, A. Tortosa, P. Travnicek, P. Treille, D. Tristram, G. Trochimczuk, M. Troncon, C. Turluer, M.-L. Tyapkin, I.A. Tzamarias, S. Uvarov, V. Valenti, G. Van Dam, P. Van Eldik, J. Van Remortel, N. Van Vulpen, I. Vegni, G. Veloso, F. Venus, W. Verdier, P. Vertogradova, Yu.L. Verzi, V. Vilanova, D. Vitale, L. Vrba, V. Wahlen, H. Washbrook, A.J. Weiser, C. Wicke, D. Wickens, J. Wilkinson, G. Winter, M. Witek, M. Yushchenko, O. Zalewska, A. Zalewski, P. Zavrtanik, D. Zhuravlov, V. Zimin, N.I. Zintchenko, A. Zupan, M.

Subjects
Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Experiment, Nuclear Experiment
Abstract

The production of two high-PT jets in the interactions of quasi-real photons in e + e - collisions at √S ee from 189 GeV to 209 GeV is studied with data corresponding to an integrated e + e - luminosity of 550 pb-1. The jets reconstructed by the k ⊥ -cluster algorithm are defined within the pseudo-rapidity range -1

Published
2008

29. Search for pentaquarks in the hadronic decays of the Z boson with the DELPHI detector at LEP

Author

Abdallah, J. Abreu, P. Adam, W. Adzic, P. Albrecht, T. Alemany-Fernandez, R. Allmendinger, T. Allport, P.P. Amaldi, U. Amapane, N. Amato, S. Anashkin, E. Andreazza, A. Andringa, S. Anjos, N. Antilogus, P. Apel, W.-D. Arnoud, Y. Ask, S. Asman, B. Augustin, J.E. Augustinus, A. Baillon, P. Ballestrero, A. Bambade, P. Barbier, R. Bardin, D. Barker, G.J. Baroncelli, A. Battaglia, M. Baubillier, M. Becks, K.-H. Begalli, M. Behrmann, A. Ben-Haim, E. Benekos, N. Benvenuti, A. Berat, C. Berggren, M. Bertrand, D. Besancon, M. Besson, N. Bloch, D. Blom, M. Bluj, M. Bonesini, M. Boonekamp, M. Booth, P.S.L. Borisov, G. Botner, O. Bouquet, B. Bowcock, T.J.V. Boyko, I. Bracko, M. Brenner, R. Brodet, E. Bruckman, P. Brunet, J.M. Buschbeck, B. Buschmann, P. Calvi, M. Camporesi, T. Canale, V. Carena, F. Castro, N. Cavallo, F. Chapkin, M. Charpentier, Ph. Checchia, P. Chierici, R. Chliapnikov, P. Chudoba, J. Chung, S.U. Cieslik, K. Collins, P. Contri, R. Cosme, G. Cossutti, F. Costa, M.J. Crennell, D. Cuevas, J. D'Hondt, J. da Silva, T. Da Silva, W. Della Ricca, G. De Angelis, A. De Boer, W. De Clercq, C. De Lotto, B. De Maria, N. De Min, A. de Paula, L. Di Ciaccio, L. Di Simone, A. Doroba, K. Drees, J. Eigen, G. Ekelof, T. Ellert, M. Elsing, M. Espirito Santo, M.C. Fanourakis, G. Fassouliotis, D. Feindt, M. Fernandez, J. Ferrer, A. Ferro, F. Flagmeyer, U. Foeth, H. Fokitis, E. Fulda-Quenzer, F. Fuster, J. Gandelman, M. Garcia, C. Gavillet, Ph. Gazis, E. Gokieli, R. Golob, B. Gomez-Ceballos, G. Goncalves, P. Graziani, E. Grosdidier, G. Grzelak, K. Guy, J. Haag, C. Hallgren, A. Hamacher, K. Hamilton, K. Haug, S. Hauler, F. Hedberg, V. Hennecke, M. Herr, H. Hoffman, J. Holmgren, S.-O. Holt, P.J. Houlden, M.A. Jackson, J.N. Jarlskog, G. Jarry, P. Jeans, D. Johansson, E.K. Jonsson, P. Joram, C. Jungermann, L. Kapusta, F. Katsanevas, S. Katsoufis, E. Kernel, G. Kersevan, B.P. Kerzel, U. King, B.T. Kjaer, N.J. Kluit, P. Kokkinias, P. Kourkoumelis, C. Kouznetsov, O. Krumstein, Z. Kucharczyk, M. Lamsa, J. Leder, G. Ledroit, F. Leinonen, L. Leitner, R. Lemonne, J. Lepeltier, V. Lesiak, T. Liebig, W. Liko, D. Lipniacka, A. Lopes, J.H. Lopez, J.M. Loukas, D. Lutz, P. Lyons, L. MacNaughton, J. Malek, A. Maltezos, S. Mandl, F. Marco, J. Marco, R. Marechal, B. Margoni, M. Marin, J.-C. Mariotti, C. Markou, A. Martinez-Rivero, C. Masik, J. Mastroyiannopoulos, N. Matorras, F. Matteuzzi, C. Mazzucato, F. Mazzucato, M. Mc Nulty, R. Meroni, C. Migliore, E. Mitaroff, W. Mjoernmark, U. Moa, T. Moch, M. Moenig, K. Monge, R. Montenegro, J. Moraes, D. Moreno, S. Morettini, P. Mueller, U. Muenich, K. Mulders, M. Mundim, L. Murray, W. Muryn, B. Myatt, G. Myklebust, T. Nassiakou, M. Navarria, F. Nawrocki, K. Nicolaidou, R. Nikolenko, M. Oblakowska-Mucha, A. Obraztsov, V. Olshevski, A. Onofre, A. Orava, R. Osterberg, K. Ouraou, A. Oyanguren, A. Paganoni, M. Paiano, S. Palacios, J.P. Palka, H. Papadopoulou, Th.D. Pape, L. Parkes, C. Parodi, F. Parzefall, U. Passeri, A. Passon, O. Peralta, L. Perepelitsa, V. Perrotta, A. Petrolini, A. Piedra, J. Pieri, L. Pierre, F. Pimenta, M. Piotto, E. Podobnik, T. Poireau, V. Pol, M.E. Polok, G. Pozdniakov, V. Pukhaeva, N. Pullia, A. Raducci, S. Rames, J. Read, A. Rebecchi, P. Rehn, J. Reid, D. Reinhardt, R. Renton, P. Richard, F. Ridky, J. Rivero, M. Rodriguez, D. Romero, A. Ronchese, P. Roudeau, P. Rovelli, T. Ruhlmann-Kleider, V. Ryabtchikov, D. Sadovsky, A. Salmi, L. Salt, J. Sander, C. Savoy-Navarro, A. Schwickerath, U. Sekulin, R. Siebel, M. Sisakian, A. Smadja, G. Smirnova, O. Sokolov, A. Sopczak, A. Sosnowski, R. Spassov, T. Stanitzki, M. Stocchi, A. Strauss, J. Stugu, B. Szczekowski, M. Szeptycka, M. Szumlak, T. Tabarelli, T. Tegenfeldt, F. Timmermans, J. Tkatchev, L. Tobin, M. Todorovova, S. Tome, B. Tonazzo, A. Tortosa, P. Travnicek, P. Treille, D. Tristram, G. Trochimczuk, M. Troncon, C. Turluer, M.-L. Tyapkin, I.A. Tyapkin, P. Tzamarias, S. Uvarov, V. Valenti, G. Van Dam, P. Van Eldik, J. van Remortel, N. Van Vulpen, I. Vegni, G. Veloso, F. Venus, W. Verdier, P. Verzi, V. Vilanova, D. Vitale, L. Vrba, V. Wahlen, H. Washbrook, A.J. Weiser, C. Wicke, D. Wickens, J. Wilkinson, G. Winter, M. Witek, M. Yushchenko, O. Zalewska, A. Zalewski, P. Zavrtanik, D. Zhuravlov, V. Zimin, N.I. Zintchenko, A. Zupan, M.

Abstract

The quark model does not exclude states composed of more than three quarks, like pentaquark systems. Controversial evidence for such states has been published in the last years, in particular: for a strange pentaquark Θ (1540)+; for a double-strange state, the Ξ (1862)- -, subsequently called Φ (1860)- -; and for a charmed state, the Θc (3100)0. If confirmed, a full pentaquark family might exist; such pentaquark states could be produced in e+ e- annihilations near the Z energy. In this Letter a search for pentaquarks is described using the DELPHI detector at LEP, characterized by powerful particle identification sub-systems crucial in the separation of the signal from the background for these states. At 95% CL, upper limits are set on the production rates 〈 N 〉 of such particles and their charge-conjugate state per Z decay: 〈 NΘ+ 〉 × Br (Θ+ → p KS 0) < 5.1 × 10-4, 〈 NΘ+ + 〉 < 1.6 × 10-3, 〈 NΦ (1860)- - 〉 × Br (Φ (1860)- - → Ξ- π-) < 2.9 × 10-4, 〈 NΘc (3100)0 〉 × Br (Θc (3100)0 → D* + over(p, ̄)) < 8.8 × 10-4. © 2007 Elsevier B.V. All rights reserved.

Published
2007

30. Investigation of colour reconnection in WW events with the DELPHI detector at LEP-2

Author

Abdallah, J. Abreu, P. Adam, W. Adzic, P. Albrecht, T. and Alemany-Fernandez, R. Allmendinger, T. Allport, P. P. and Amaldi, U. Amapane, N. Amato, S. Anashkin, E. Andreazza, A. Andringa, S. Anjos, N. Antilogus, P. Apel, W-D. and Arnoud, Y. Ask, S. Asman, B. Augustin, J. E. Augustinus, A. Baillon, P. Ballestrero, A. Bambade, P. Barbier, R. and Bardin, D. Barker, G. J. Baroncelli, A. Battaglia, M. and Baubillier, M. Becks, K-H. Begalli, M. Behrmann, A. and Ben-Haim, E. Benekos, N. Benvenuti, A. Berat, C. and Berggren, M. Berntzon, L. Bertrand, D. Besancon, M. and Besson, N. Bloch, D. Blom, M. Bluj, M. Bonesini, M. and Boonekamp, M. Booth, P. S. L. Borisov, G. Botner, O. and Bouquet, B. Bowcock, T. J. V. Boyko, I. Bracko, M. and Brenner, R. Brodet, E. Bruckman, P. Brunet, J. M. and Buschbeck, B. Buschmann, P. Calvi, M. Camporesi, T. and Canale, V. Carena, F. Castro, N. Cavallo, F. Chapkin, M. and Charpentier, Ph. Checchia, P. Chierici, R. Chliapnikov, P. Chudoba, J. Chung, S. U. Cieslik, K. Collins, P. and Contri, R. Cosme, G. Cossutti, F. Costa, M. J. Crennell, D. Cuevas, J. D'Hondt, J. Dalmau, J. Da Silva, T. Da Silva, W. Della Ricca, G. De Angelis, A. De Boer, W. De Clercq, C. De Lotto, B. De Maria, N. De Min, A. De Paula, L. Di Ciaccio, L. Di Simone, A. Doroba, K. Drees, J. Eigen, G. Ekelof, T. Ellert, M. Elsing, M. Santo, M. C. Espirito Fanourakis, G. Fassouliotis, D. Feindt, M. and Fernandez, J. Ferrer, A. Ferro, F. Flagmeyer, U. and Foeth, H. Fokitis, E. Fulda-Quenzer, F. Fuster, J. and Gandelman, M. Garcia, C. Gavillet, Ph. Gazis, E. and Gokieli, R. Golob, B. Gomez-Ceballos, G. Goncalves, P. and Graziani, E. Grosdidier, G. Grzelak, K. Guy, J. Haag, C. and Hallgren, A. Hamacher, K. Hamilton, K. Haug, S. and Hauler, F. Hedberg, V. Hennecke, M. Herr, H. Hoffman, J. and Holmgren, S-O. Holt, P. J. Houlden, M. A. Jackson, J. N. and Jarlskog, G. Jarry, P. Jeans, D. Johansson, E. K. and Johansson, P. D. Jonsson, P. Joram, C. Jungermann, L. and Kapusta, F. Katsanevas, S. Katsoufis, E. Kernel, G. and Kersevan, B. P. Kerzel, U. King, B. T. Kjaer, N. J. and Kluit, P. Kokkinias, P. Kourkoumelis, C. Kouznetsov, O. and Krumstein, Z. Kucharczyk, M. Lamsa, J. Leder, G. and Ledroit, F. Leinonen, L. Leitner, R. Lemonne, J. and Lepeltier, V. Lesiak, T. Liebig, W. Liko, D. Lipniacka, A. Lopes, J. H. Lopez, J. M. Loukas, D. Lutz, P. and Lyons, L. MacNaughton, J. Malek, A. Maltezos, S. Mandl, F. Marco, J. Marco, R. Marechal, B. Margoni, M. and Marin, J-C. Mariotti, C. Markou, A. Martinez-Rivero, C. and Masik, J. Mastroyiannopoulos, N. Matorras, F. Matteuzzi, C. and Mazzucato, F. Mazzucato, M. Mc Nulty, R. Meroni, C. and Migliore, E. Mitaro, W. Mjoernmark, U. Moa, T. Moch, M. and Moenig, K. Monge, R. Montenegro, J. Moraes, D. and Moreno, S. Morettini, P. Mueller, U. Muenich, K. and Mulders, M. Mundim, L. Murray, W. Muryn, B. Myatt, G. and Myklebust, T. Nassiakou, M. Navarria, F. Nawrocki, K. and Nicolaidou, R. Nikolenko, M. Oblakowska-Mucha, A. and Obraztsov, V. Olshevski, A. Onofre, A. Orava, R. and Osterberg, K. Ouraou, A. Oyanguren, A. Paganoni, M. and Paiano, S. Palacios, J. P. Palka, H. Papadopoulou, Th. D. and Pape, L. Parkes, C. Parodi, F. Parzefall, U. and Passeri, A. Passon, O. Peralta, L. Perepelitsa, V. and Perrotta, A. Petrolini, A. Piedra, J. Pieri, L. Pierre, F. Pimenta, M. Piotto, E. Podobnik, T. Poireau, V. and Pol, M. E. Polok, G. Pozdniakov, V. Pukhaeva, N. Pullia, A. Rames, J. Read, A. Rebecchi, P. Rehn, J. Reid, D. and Reinhardt, R. Renton, P. Richard, F. Ridky, J. and Rivero, M. Rodriguez, D. Romero, A. Ronchese, P. and Roudeau, P. Rovelli, T. Ruhlmann-Kleider, V. Ryabtchikov, D. and Sadovsky, A. Salmi, L. Salt, J. Sander, C. and Savoy-Navarro, A. Schwickerath, U. Sekulin, R. Siebel, M. and Sisakian, A. Smadja, G. Smirnova, O. Sokolov, A. and Sopczak, A. Sosnowski, R. Spassov, T. Stanitzki, M. and Stocchi, A. Strauss, J. Stugu, B. Szczekowski, M. and Szeptycka, M. Szumlak, T. Tabarelli, T. Taffard, A. C. and Tegenfeldt, F. Timmermans, J. Tkatchev, L. Tobin, M. and Todorovova, S. Tome, B. Tonazzo, A. Tortosa, P. and Travnicek, P. Treille, D. Tristram, G. Trochimczuk, M. and Troncon, C. Turluer, M-L. Tyapkin, I. A. Tyapkin, P. and Tzamarias, S. Uvarov, V. Valenti, G. Van Dam, P. Van Eldik, J. Van Remortel, N. Van Vulpen, I. Vegni, G. and Veloso, F. Venus, W. Verdier, P. Verzi, V. Vilanova, D. and Vitale, L. Vrba, V. Wahlen, H. Washbrook, A. J. and Weiser, C. Wicke, D. Wickens, J. Wilkinson, G. Winter, M. Witek, M. Yushchenko, O. Zalewska, A. Zalewski, P. and Zavrtanik, D. Zhuravlov, V. Zimin, N. I. Zintchenko, A. and Zupan, M.

Subjects
High Energy Physics::Phenomenology, High Energy Physics::Experiment
Abstract

In the reaction e(+)e(-) -> WW -> (q(1) (q) over bar (2))(q(3)(q) over bar (4)) the usual hadronization models treat the colour singlets q(1)(q) over bar (2) and q(3)(q) over bar (4) coming from two W bosons independently. However, since the. nal state partons may coexist in space and time, cross-talk between the two evolving hadronic systems may be possible during fragmentation through soft gluon exchange. This e. ect is known as colour reconnection. In this article the results of the investigation of colour reconnection e. ects in fully hadronic decays of W pairs in DELPHI at LEP are presented. Two complementary analyses were performed, studying the particle. ow between jets and W mass estimators, with negligible correlation between them, and the results were combined and compared to models. In the framework of the SK-I model, the value for its. parameter most compatible with the data was found to be: (SK)-S-kappa-I = 2.2(-1.3) (+2.5) corresponding to the probability of reconnection P-reco to be in the range 0.31 < P-reco < 0.68 at 68% confidence level with its best value at 0.52.

Published
2007

31. Zγ* production in e+e- interactions at √s = 183-209 GeV

Author

Abdallah, J. Abreu, P. Adam, W. Adzic, P. Albrecht, T. Alemany-Fernandez, R. Allmendinger, T. Allport, P.P. Amaldi, U. Amapane, N. Amato, S. Anashkin, E. Andreazza, A. Andringa, S. Anjos, N. Antilogus, P. Apel, W.-D. Arnoud, Y. Ask, S. Asman, B. Augustin, J.E. Augustinus, A. Baillon, P. Ballestrero, A. Bambade, P. Barbier, R. Bardin, D. Barker, G.J. Baroncelli, A. Battaglia, M. Baubillier, M. Becks, K.-H. Begalli, M. Behrmann, A. Ben-Haim, E. Benekos, N. Benvenuti, A. Berat, C. Berggren, M. Bertrand, D. Besancon, M. Besson, N. Bloch, D. Blom, M. Bluj, M. Bonesini, M. Boonekamp, M. Booth, P.S.L. Borisov, G. Botner, O. Bouquet, B. Bowcock, T.J.V. Boyko, I. Bracko, M. Brenner, R. Brodet, E. Bruckman, P. Brunet, J.M. Buschbeck, B. Buschmann, P. Calvi, M. Camporesi, T. Canale, V. Carena, F. Castro, N. Cavallo, F. Chapkin, M. Charpentier, Ph. Checchia, P. Chierici, R. Chliapnikov, P. Chudoba, J. Chung, S.U. Cieslik, K. Collins, P. Contri, R. Cosme, G. Cossutti, F. Costa, M.J. Crennell, D. Cuevas, J. D'Hondt, J. Da Silva, T. Da Silva, W. Della Ricca, G. De Angelis, A. De Boer, W. De Clercq, C. De Lotto, B. De Maria, N. De Min, A. De Paula, L. Di Ciaccio, L. Di Simone, A. Doroba, K. Drees, J. Eigen, G. Ekelof, T. Ellert, M. Elsing, M. Espirito Santo, M.C. Fanourakis, G. Fassouliotis, D. Feindt, M. Fernandez, J. Ferrer, A. Ferro, F. Flagmeyer, U. Foeth, H. Fokitis, E. Fulda-Quenzer, F. Fuster, J. Gandelman, M. Garcia, C. Gavillet, Ph. Gazis, E. Gokieli, R. Golob, B. Gomez-Ceballos, G. Goncalves, P. Graziani, E. Grosdidier, G. Grzelak, K. Guy, J. Haag, C. Hallgren, A. Hamacher, K. Hamilton, K. Haug, S. Hauler, F. Hedberg, V. Hennecke, M. Herr, H. Hoffman, J. Holmgren, S-O. Holt, P.J. Houlden, M.A. Jackson, J.N. Jarlskog, G. Jarry, P. Jeans, D. Johansson, E.K. Jonsson, P. Joram, C. Jungermann, L. Kapusta, F. Katsanevas, S. Katsoufis, E. Kernel, G. Kersevan, B.P. Kerzel, U. King, B.T. Kjaer, N.J. Kluit, P. Kokkinias, P. Kourkoumelis, C. Kouznetsov, O. Krumstein, Z. Kucharczyk, M. Lamsa, J. Leder, G. Ledroit, F. Leinonen, L. Leitner, R. Lemonne, J. Lepeltier, V. Lesiak, T. Liebig, W. Liko, D. Lipniacka, A. Lopes, J.H. Lopez, J.M. Loukas, D. Lutz, P. Lyons, L. MacNaughton, J. Malek, A. Maltezos, S. Mandl, F. Marco, J. Marco, R. Marechal, B. Margoni, M. Marin, J.-C. Mariotti, C. Markou, A. Martinez-Rivero, C. Masik, J. Mastroyiannopoulos, N. Matorras, F. Matteuzzi, C. Mazzucato, F. Mazzucato, M. Mc Nulty, R. Meroni, C. Migliore, E. Mitaroff, W. Mjoernmark, U. Moa, T. Moch, M. Moenig, K. Monge, R. Montenegro, J. Moraes, D. Moreno, S. Morettini, P. Mueller, U. Muenich, K. Mulders, M. Mundim, L. Murray, W. Muryn, B. Myatt, G. Myklebust, T. Nassiakou, M. Navarria, F. Nawrocki, K. Nicolaidou, R. Nikolenko, M. Oblakowska-Mucha, A. Obraztsov, V. Olshevski, A. Onofre, A. Orava, R. Osterberg, K. Ouraou, A. Oyanguren, A. Paganoni, M. Paiano, S. Palacios, J.P. Palka, H. Papadopoulou, Th.D. Pape, L. Parkes, C. Parodi, F. Parzefall, U. Passeri, A. Passon, O. Peralta, L. Perepelitsa, V. Perrotta, A. Petrolini, A. Piedra, J. Pieri, L. Pierre, F. Pimenta, M. Piotto, E. Podobnik, T. Poireau, V. Pol, M.E. Polok, G. Pozdniakov, V. Pukhaeva, N. Pullia, A. Rames, J. Read, A. Rebecchi, P. Rehn, J. Reid, D. Reinhardt, R. Renton, P. Richard, F. Ridky, J. Rivero, M. Rodriguez, D. Romero, A. Ronchese, P. Roudeau, P. Rovelli, T. Ruhlmann-Kleider, V. Ryabtchikov, D. Sadovsky, A. Salmi, L. Salt, J. Sander, C. Savoy-Navarro, A. Schwickerath, U. Sekulin, R. Siebel, M. Sisakian, A. Smadja, G. Smirnova, O. Sokolov, A. Sopczak, A. Sosnowski, R. Spassov, T. Stanitzki, M. Stocchi, A. Strauss, J. Stugu, B. Szczekowski, M. Szeptycka, M. Szumlak, T. Tabarelli, T. Tegenfeldt, F. Timmermans, J. Tkatchev, L. Tobin, M. Todorovova, S. Tome, B. Tonazzo, A. Tortosa, P. Travnicek, P. Treille, D. Tristram, G. Trochimczuk, M. Troncon, C. Turluer, M.-L. Tyapkin, I.A. Tyapkin, P. Tzamarias, S. Uvarov, V. Valenti, G. Van Dam, P. Van Eldik, J. Van Remortel, N. Van Vulpen, I. Vegni, G. Veloso, F. Venus, W. Verdier, P. Verzi, V. Vilanova, D. Vitale, L. Vrba, V. Wahlen, H. Washbrook, A.J. Weiser, C. Wicke, D. Wickens, J. Wilkinson, G. Winter, M. Witek, M. Yushchenko, O. Zalewska, A. Zalewski, P. Zavrtanik, D. Zhuravlov, V. Zimin, N.I. Zintchenko, A. Zupan, M.

Subjects
High Energy Physics::Experiment
Abstract

Measurements of Zγ* production are presented using data collected by the DELPHI detector at centre-of-mass energies ranging from 183 to 209 GeV, corresponding to an integrated luminosity of about 667 pb-1. The measurements cover a wide range of the possible final state four-fermion configurations: hadronic and leptonic (e+e-qq, μ+μ-qq̄, qqνν), fully leptonic (l +l-l'+l'-) and fully hadronic final states (qq̄, qq̄, with a low mass qq̄ pair). Measurements of the Zγ* cross-section for the various final states have been compared with the Standard Model expectations and found to be consistent within the errors. In addition, a total cross-section measurement of the l +l-l'+l'- cross-section is reported, and found to be in agreement with the prediction of the Standard Model. © 2007 Springer-Verlag / Società Italiana di Fisica.

Published
2007

32. Search for a fourth generation b′-quark at LEP-II at √s = 196-209 GeV

Author

Abdallah, J. Abreu, P. Adam, W. Adzic, P. Albrecht, T. Alemany-Fernandez, R. Allmendinger, T. Allport, P.P. Amaldi, U. Amapane, N. Amato, S. Anashkin, E. Andreazza, A. Andringa, S. Anjos, N. Antilogus, P. Apel, W.-D. Arnoud, Y. Ask, S. Asman, B. Augustin, J.E. Augustinus, A. Baillon, P. Ballestrero, A. Bambade, P. Barbier, R. Bardin, D. Barker, G.J. Baroncelli, A. Battaglia, M. Baubillier, M. Becks, K.-H. Begalli, M. Behrmann, A. Ben-Haim, E. Benekos, N. Benvenuti, A. Berat, C. Berggren, M. Berntzon, L. Bertrand, D. Besancon, M. Besson, N. Bloch, D. Blom, M. Bluj, M. Bonesini, M. Boonekamp, M. Booth, P.S.L. Borisov, G. Botner, O. Bouquet, B. Bowcock, T.J.V. Boyko, I. Bracko, M. Brenner, R. Brodet, E. Bruckman, P. Brunet, J.M. Buschbeck, B. Buschmann, P. Calvi, M. Camporesi, T. Canale, V. Carena, F. Castro, N. Cavallo, F. Chapkin, M. Charpentier, Ph. Checchia, P. Chierici, R. Chliapnikov, P. Chudoba, J. Chung, S.U. Cieslik, K. Collins, P. Contri, R. Cosme, G. Cossutti, F. Costa, M.J. Crennell, D. Cuevas, J. D'Hondt, J. Dalmau, J. Da Silva, T. Da Silva, W. Della Ricca, G. De Angelis, A. De Boer, W. De Clercq, C. De Lotto, B. De Maria, N. De Min, A. De Paula, L. Di Ciaccio, L. Di Simone, A. Doroba, K. Drees, J. Eigen, G. Ekelof, T. Ellert, M. Elsing, M. Espirito Santo, M.C. Fanourakis, G. Fassouliotis, D. Feindt, M. Fernandez, J. Ferrer, A. Ferro, F. Flagmeyer, U. Foeth, H. Fokitis, E. Fulda-Quenzer, F. Fuster, J. Gandelman, M. Garcia, C. Gavillet, Ph. Gazis, E. Gokieli, R. Golob, B. Gomez-Ceballos, G. Goncalves, P. Graziani, E. Grosdidier, G. Grzelak, K. Guy, J. Haag, C. Hallgren, A. Hamacher, K. Hamilton, K. Haug, S. Hauler, F. Hedberg, V. Hennecke, M. Herr, H. Hoffman, J. Holmgren, S.-O. Holt, P.J. Houlden, M.A. Jackson, J.N. Jarlskog, G. Jarry, P. Jeans, D. Johansson, E.K. Johansson, P.D. Jonsson, P. Joram, C. Jungermann, L. Kapusta, F. Katsanevas, S. Katsoufis, E. Kernel, G. Kersevan, B.P. Kerzel, U. King, B.T. Kjaer, N.J. Kluit, P. Kokkinias, P. Kourkoumelis, C. Kouznetsov, O. Krumstein, Z. Kucharczyk, M. Lamsa, J. Leder, G. Ledroit, F. Leinonen, L. Leitner, R. Lemonne, J. Lepeltier, V. Lesiak, T. Liebig, W. Liko, D. Lipniacka, A. Lopes, J.H. Lopez, J.M. Loukas, D. Lutz, P. Lyons, L. MacNaughton, J. Malek, A. Maltezos, S. Mandl, F. Marco, J. Marco, R. Marechal, B. Margoni, M. Marin, J.-C. Mariotti, C. Markou, A. Martinez-Rivero, C. Masik, J. Mastroyiannopoulos, N. Matorras, F. Matteuzzi, C. Mazzucato, F. Mazzucato, M. Mc Nulty, R. Meroni, C. Migliore, E. Mitaroff, W. Mjoernmark, U. Moa, T. Moch, M. Moenig, K. Monge, R. Montenegro, J. Moraes, D. Moreno, S. Morettini, P. Mueller, U. Muenich, K. Mulders, M. Mundim, L. Murray, W. Muryn, B. Myatt, G. Myklebust, T. Nassiakou, M. Navarria, F. Nawrocki, K. Nicolaidou, R. Nikolenko, M. Oblakowska-Mucha, A. Obraztsov, V. Oliveira, O. Oliveira, S.M. Olshevski, A. Onofre, A. Orava, R. Osterberg, K. Ouraou, A. Oyanguren, A. Paganoni, M. Paiano, S. Palacios, J.P. Palka, H. Papadopoulou, Th.D. Pape, L. Parkes, C. Parodi, F. Parzefall, U. Passeri, A. Passon, O. Peralta, L. Perepelitsa, V. Perrotta, A. Petrolini, A. Piedra, J. Pieri, L. Pierre, F. Pimenta, M. Piotto, E. Podobnik, T. Poireau, V. Pol, M.E. Polok, G. Pozdniakov, V. Pukhaeva, N. Pullia, A. Rames, J. Read, A. Rebecchi, P. Rehn, J. Reid, D. Reinhardt, R. Renton, P. Richard, F. Ridky, J. Rivero, M. Rodriguez, D. Romero, A. Ronchese, P. Roudeau, P. Rovelli, T. Ruhlmann-Kleider, V. Ryabtchikov, D. Sadovsky, A. Salmi, L. Salt, J. Sander, C. Santos, R. Savoy-Navarro, A. Schwickerath, U. Sekulin, R. Siebel, M. Sisakian, A. Smadja, G. Smirnova, O. Sokolov, A. Sopczak, A. Sosnowski, R. Spassov, T. Stanitzki, M. Stocchi, A. Strauss, J. Stugu, B. Szczekowski, M. Szeptycka, M. Szumlak, T. Tabarelli, T. Taffard, A.C. Tegenfeldt, F. Timmermans, J. Tkatchev, L. Tobin, M. Todorovova, S. Tome, B. Tonazzo, A. Tortosa, P. Travnicek, P. Treille, D. Tristram, G. Trochimczuk, M. Troncon, C. Turluer, M.-L. Tyapkin, I.A. Tyapkin, P. Tzamarias, S. Uvarov, V. Valenti, G. Van Dam, P. Van Eldik, J. Van Remortel, N. Van Vulpen, I. Vegni, G. Veloso, F. Venus, W. Verdier, P. Verzi, V. Vilanova, D. Vitale, L. Vrba, V. Wahlen, H. Washbrook, A.J. Weiser, C. Wicke, D. Wickens, J. Wilkinson, G. Winter, M. Witek, M. Yushchenko, O. Zalewska, A. Zalewski, P. Zavrtanik, D. Zhuravlov, V. Zimin, N.I. Zintchenko, A. Zupan, M.

Abstract

A search for the pair production of fourth generation b'-quarks was performed using data taken by the DELPHI detector at LEP-II. The analysed data were collected at centre-of-mass energies ranging from 196 to 209 GeV, corresponding to an integrated luminosity of 420 pb-1. No evidence for a signal was found. Upper limits on BR(b'→bZ) and BR(b'→cW) were obtained for b' masses ranging from 96 to 103 GeV/c 2. These limits, together with the theoretical branching ratios predicted by a sequential four generations model, were used to constrain the value of RCKM = | Vtb′Vtb/Vcb′|, where V cb′, Vtb′ and Vtb are elements of the extended CKM matrix. © Springer-Verlag Berlin Heidelberg 2007.

Published
2007

33. Study of multi-muon bundles in cosmic ray showers detected with the DELPHI detector at LEP

Author

Abdallah, J. Abreu, P. Adam, W. Adzic, P. Albrecht, T. Alemany-Fernandez, R. Allmendinger, T. Allport, P.P. Amaldi, U. Amapane, N. Amato, S. Anashkin, E. Andreazza, A. Andringa, S. Anjos, N. Antilogus, P. Apel, W.-D. Arnoud, Y. Ask, S. Asman, B. Augustinus, A. Baillon, P. Ballestrero, A. Bambade, P. Barbier, R. Bardin, D. Barker, G.J. Baroncelli, A. Battaglia, M. Baubillier, M. Becks, K.-H. Begalli, M. Behrmann, A. Ben-Haim, E. Benekos, N. Benvenuti, A. Berat, C. Berggren, M. Bertrand, D. Besancon, M. Besson, N. Bloch, D. Blom, M. Bluj, M. Bonesini, M. Boonekamp, M. Booth, P.S.L. Borisov, G. Botner, O. Bouquet, B. Bowcock, T.J.V. Boyko, I. Bracko, M. Brenner, R. Brodet, E. Bruckman, P. Brunet, J.M. Buschbeck, B. Buschmann, P. Calvi, M. Camporesi, T. Canale, V. Carena, F. Castro, N. Cavallo, F. Chapkin, M. Charpentier, Ph. Checchia, P. Chierici, R. Chliapnikov, P. Chudoba, J. Chung, S.U. Cieslik, K. Collins, P. Contri, R. Cosme, G. Cossutti, F. Costa, M.J. Crennell, D. Cuevas, J. D'Hondt, J. da Silva, T. Da Silva, W. Della Ricca, G. De Angelis, A. De Boer, W. De Clercq, C. De Lotto, B. De Maria, N. De Min, A. de Paula, L. Di Ciaccio, L. Di Simone, A. Doroba, K. Drees, J. Eigen, G. Ekelof, T. Ellert, M. Elsing, M. Espirito Santo, M.C. Fanourakis, G. Fassouliotis, D. Feindt, M. Fernandez, J. Ferrer, A. Ferro, F. Flagmeyer, U. Foeth, H. Fokitis, E. Fulda-Quenzer, F. Fuster, J. Gandelman, M. Garcia, C. Gavillet, Ph. Gazis, E. Gokieli, R. Golob, B. Gomez-Ceballos, G. Goncalves, P. Graziani, E. Grosdidier, G. Grzelak, K. Guy, J. Haag, C. Hallgren, A. Hamacher, K. Hamilton, K. Haug, S. Hauler, F. Hedberg, V. Hennecke, M. Herr, H. Hoffman, J. Holmgren, S.-O. Holt, P.J. Houlden, M.A. Jackson, J.N. Jarlskog, G. Jarry, P. Jeans, D. Johansson, E.K. Jonsson, P. Joram, C. Jungermann, L. Kapusta, F. Katsanevas, S. Katsoufis, E. Kernel, G. Kersevan, B.P. Kerzel, U. King, B.T. Kjaer, N.J. Kluit, P. Kokkinias, P. Kourkoumelis, C. Kouznetsov, O. Krumstein, Z. Kucharczyk, M. Lamsa, J. Leder, G. Ledroit, F. Leinonen, L. Leitner, R. Lemonne, J. Lepeltier, V. Lesiak, T. Liebig, W. Liko, D. Lipniacka, A. Lopes, J.H. Lopez, J.M. Loukas, D. Lutz, P. Lyons, L. MacNaughton, J. Malek, A. Maltezos, S. Mandl, F. Marco, J. Marco, R. Marechal, B. Margoni, M. Marin, J.-C. Mariotti, C. Markou, A. Martinez-Rivero, C. Masik, J. Mastroyiannopoulos, N. Matorras, F. Matteuzzi, C. Mazzucato, F. Mazzucato, M. Mc Nulty, R. Meroni, C. Migliore, E. Mitaroff, W. Mjoernmark, U. Moa, T. Moch, M. Moenig, K. Monge, R. Montenegro, J. Moraes, D. Moreno, S. Morettini, P. Mueller, U. Muenich, K. Mulders, M. Mundim, L. Murray, W. Muryn, B. Myatt, G. Myklebust, T. Nassiakou, M. Navarria, F. Nawrocki, K. Nicolaidou, R. Nikolenko, M. Oblakowska-Mucha, A. Obraztsov, V. Olshevski, A. Onofre, A. Orava, R. Osterberg, K. Ouraou, A. Oyanguren, A. Paganoni, M. Paiano, S. Palacios, J.P. Palka, H. Papadopoulou, Th.D. Pape, L. Parkes, C. Parodi, F. Parzefall, U. Passeri, A. Passon, O. Peralta, L. Perepelitsa, V. Perrotta, A. Petrolini, A. Piedra, J. Pieri, L. Pierre, F. Pimenta, M. Piotto, E. Podobnik, T. Poireau, V. Pol, M.E. Polok, G. Pozdniakov, V. Pukhaeva, N. Pullia, A. Rames, J. Read, A. Rebecchi, P. Rehn, J. Reid, D. Reinhardt, R. Renton, P. Richard, F. Ridky, J. Rivero, M. Rodriguez, D. Romero, A. Ronchese, P. Roudeau, P. Rovelli, T. Ruhlmann-Kleider, V. Ryabtchikov, D. Sadovsky, A. Salmi, L. Salt, J. Sander, C. Savoy-Navarro, A. Schwickerath, U. Sekulin, R. Shellard, R.C. Siebel, M. Sisakian, A. Smadja, G. Smirnova, O. Sokolov, A. Sopczak, A. Sosnowski, R. Spassov, T. Stanitzki, M. Stocchi, A. Strauss, J. Stugu, B. Szczekowski, M. Szeptycka, M. Szumlak, T. Tabarelli, T. Taffard, A.C. Tegenfeldt, F. Timmermans, J. Tkatchev, L. Tobin, M. Todorovova, S. Tome, B. Tonazzo, A. Tortosa, P. Travnicek, P. Treille, D. Tristram, G. Trochimczuk, M. Troncon, C. Turluer, M.-L. Tyapkin, I.A. Tyapkin, P. Tzamarias, S. Uvarov, V. Valenti, G. Van Dam, P. Van Eldik, J. van Remortel, N. Van Vulpen, I. Vegni, G. Veloso, F. Venus, W. Verdier, P. Verzi, V. Vilanova, D. Vitale, L. Vrba, V. Wahlen, H. Washbrook, A.J. Weiser, C. Wicke, D. Wickens, J. Wilkinson, G. Winter, M. Witek, M. Yushchenko, O. Zalewska, A. Zalewski, P. Zavrtanik, D. Zhuravlov, V. Zimin, N.I. Zintchenko, A. Zupan, M.

Subjects
Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Experiment
Abstract

The DELPHI detector at LEP has been used to measure multi-muon bundles originating from cosmic ray interactions with air. The cosmic events were recorded in "parasitic mode" between individual e+e- interactions and the total live time of this data taking is equivalent to 1.6 × 106 s. The DELPHI apparatus is located about 100 m underground and the 84 metres rock overburden imposes a cutoff of about 52 GeV/c on muon momenta. The data from the large volume Hadron Calorimeter allowed the muon multiplicity of 54,201 events to be reconstructed. The resulting muon multiplicity distribution is compared with the prediction of the Monte Carlo simulation based on CORSIKA/QGSJET01. The model fails to describe the abundance of high multiplicity events. The impact of QGSJET internal parameters on the results is also studied. © 2007 Elsevier B.V. All rights reserved.

Published
2007

34. Study of triple-gauge-boson couplings ZZZ, ZZγ and Zγγ at LEP

Author

Abdallah, J. Abreu, P. Adam, W. Adzic, P. Albrecht, T. Alemany-Fernandez, R. Allmendinger, T. Allport, P.P. Amaldi, U. Amapane, N. Amato, S. Anashkin, E. Andreazza, A. Andringa, S. Anjos, N. Antilogus, P. Apel, W.-D. Arnoud, Y. Ask, S. Asman, B. Augustin, J.E. Augustinus, A. Baillon, P. Ballestrero, A. Bambade, P. Barbier, R. Bardin, D. Barker, G.J. Baroncelli, A. Battaglia, M. Baubillier, M. Becks, K.-H. Begalli, M. Behrmann, A. Ben-Haim, E. Benekos, N. Benvenuti, A. Berat, C. Berggren, M. Bertrand, D. Besancon, M. Besson, N. Bloch, D. Blom, M. Bluj, M. Bonesini, M. Boonekamp, M. Booth, P.S.L. Borisov, G. Botner, O. Bouquet, B. Bowcock, T.J.V. Boyko, I. Bracko, M. Brenner, R. Brodet, E. Bruckman, P. Brunet, J.M. Buschbeck, B. Buschmann, P. Calvi, M. Camporesi, T. Canale, V. Carena, F. Castro, N. Cavallo, F. Chapkin, M. Charpentier, Ph. Checchia, P. Chierici, R. Chliapnikov, P. Chudoba, J. Chung, S.U. Cieslik, K. Collins, P. Contri, R. Cosme, G. Cossutti, F. Costa, M.J. Crennell, D. Cuevas, J. D'Hondt, J. Da Silva, T. Da Silva, W. Della Ricca, G. De Angelis, A. De Boer, W. De Clercq, C. De Lotto, B. De Maria, N. De Min, A. De Paula, L. Di Ciaccio, L. Di Simone, A. Doroba, K. Drees, J. Eigen, G. Ekelof, T. Ellert, M. Elsing, M. Espirito Santo, M.C. Fanourakis, G. Fassouliotis, D. Feindt, M. Fernandez, J. Ferrer, A. Ferro, F. Flagmeyer, U. Foeth, H. Fokitis, E. Fulda-Quenzer, F. Fuster, J. Gandelman, M. Garcia, C. Gavillet, Ph. Gazis, E. Gokieli, R. Golob, B. Gomez-Ceballos, G. Goncalves, P. Graziani, E. Grosdidier, G. Grzelak, K. Guy, J. Haag, C. Hallgren, A. Hamacher, K. Hamilton, K. Haug, S. Hauler, F. Hedberg, V. Hennecke, M. Herr, H. Hoffman, J. Holmgren, S.-O. Holt, P.J. Houlden, M.A. Jackson, J.N. Jarlskog, G. Jarry, P. Jeans, D. Johansson, E.K. Jonsson, P. Joram, C. Jungermann, L. Kapusta, F. Katsanevas, S. Katsoufis, E. Kernel, G. Kersevan, B.P. Kerzel, U. King, B.T. Kjaer, N.J. Kluit, P. Kokkinias, P. Kourkoumelis, C. Kouznetsov, O. Krumstein, Z. Kucharczyk, M. Lamsa, J. Leder, G. Ledroit, F. Leinonen, L. Leitner, R. Lemonne, J. Lepeltier, V. Lesiak, T. Liebig, W. Liko, D. Lipniacka, A. Lopes, J.H. Lopez, J.M. Loukas, D. Lutz, P. Lyons, L. MacNaughton, J. Malek, A. Maltezos, S. Mandl, F. Marco, J. Marco, R. Marechal, B. Margoni, M. Marin, J.-C. Mariotti, C. Markou, A. Martinez-Rivero, C. Masik, J. Mastroyiannopoulos, N. Matorras, F. Matteuzzi, C. Mazzucato, F. Mazzucato, M. Mc Nulty, R. Meroni, C. Migliore, E. Mitaroff, W. Mjoernmark, U. Moa, T. Moch, M. Moenig, K. Monge, R. Montenegro, J. Moraes, D. Moreno, S. Morettini, P. Mueller, U. Muenich, K. Mulders, M. Mundim, L. Murray, W. Muryn, B. Myatt, G. Myklebust, T. Nassiakou, M. Navarria, F. Nawrocki, K. Nicolaidou, R. Nikolenko, M. Oblakowska-Mucha, A. Obraztsov, V. Olshevski, A. Onofre, A. Orava, R. Osterberg, K. Ouraou, A. Oyanguren, A. Paganoni, M. Paiano, S. Palacios, J.P. Palka, H. Papadopoulou, Th.D. Pape, L. Parkes, C. Parodi, F. Parzefall, U. Passeri, A. Passon, O. Peralta, L. Perepelitsa, V. Perrotta, A. Petrolini, A. Piedra, J. Pieri, L. Pierre, F. Pimenta, M. Piotto, E. Podobnik, T. Poireau, V. Pol, M.E. Polok, G. Pozdniakov, V. Pukhaeva, N. Pullia, A. Rames, J. Read, A. Rebecchi, P. Rehn, J. Reid, D. Reinhardt, R. Renton, P. Richard, F. Ridky, J. Rivero, M. Rodriguez, D. Romero, A. Ronchese, P. Roudeau, P. Rovelli, T. Ruhlmann-Kleider, V. Ryabtchikov, D. Sadovsky, A. Salmi, L. Salt, J. Sander, C. Savoy-Navarro, A. Schwickerath, U. Sekulin, R. Siebel, M. Sisakian, A. Smadja, G. Smirnova, O. Sokolov, A. Sopczak, A. Sosnowski, R. Spassov, T. Stanitzki, M. Stocchi, A. Strauss, J. Stugu, B. Szczekowski, M. Szeptycka, M. Szumlak, T. Tabarelli, T. Tegenfeldt, F. Timmermans, J. Tkatchev, L. Tobin, M. Todorovova, S. Tome, B. Tonazzo, A. Tortosa, P. Travnicek, P. Treille, D. Tristram, G. Trochimczuk, M. Troncon, C. Turluer, M.-L. Tyapkin, I.A. Tyapkin, P. Tzamarias, S. Uvarov, V. Valenti, G. Van Dam, P. Van Eldik, J. Van Remortel, N. Van Vulpen, I. Vegni, G. Veloso, F. Venus, W. Verdier, P. Verzi, V. Vilanova, D. Vitale, L. Vrba, V. Wahlen, H. Washbrook, A.J. Weiser, C. Wicke, D. Wickens, J. Wilkinson, G. Winter, M. Witek, M. Yushchenko, O. Zalewska, A. Zalewski, P. Zavrtanik, D. Zhuravlov, V. Zimin, N.I. Zintchenko, A. Zupan, M.

Abstract

Neutral triple-gauge-boson couplings ZZZ, ZZγ and Zγγ have been studied with the DELPHI detector using data at energies between 183 and 208 GeV. Limits are derived on these couplings from an analysis of the reactions e+e-→Zγ, using data from the final states γff̄, with f=q or ν, from e+e -→ZZ, using data from the four-fermion final states qq̄qq̄, qq̄μ+μ-, qq̄e +e-, qq̄νν̄, μ+μ -νν̄ and e+e-νν̄, and from e+e-→Zγ*, in which the final state γ is off mass-shell, using data from the four-fermion final states qq̄e+e- and qq̄μ+μ-. No evidence for the presence of such couplings is observed, in agreement with the predictions of the Standard Model. © 2007 Springer-Verlag / Società Italiana di Fisica.

Published
2007

35. Canonical decomposition of ictal scalp EEG reliably detects the seizure onset zone

Author

Anneleen Vergult, Patrick Dupont, S. Van Huffel, André Palmini, L. De Lathauwer, W. Van Paesschen, W. De Clercq, and M. De Vos

Subjects
Canonical decomposition, Cognitive Neuroscience, Speech recognition, Seizure onset zone, Electroencephalography, Sensitivity and Specificity, Epilepsy, Nuclear magnetic resonance, Seizures, medicine, Humans, Ictal, Diagnosis, Computer-Assisted, Mathematics, Brain Mapping, Scalp, medicine.diagnostic_test, Brain, Reproducibility of Results, Scalp eeg, medicine.disease, nervous system diseases, medicine.anatomical_structure, nervous system, Neurology, Higher order tensor, Algorithms
Abstract

Long-term electroencephalographic (EEG) recordings are important in the presurgical evaluation of refractory partial epilepsy for the delineation of the irritative and ictal onset zones. In this paper we introduce a new algorithm for an automatic, fast and objective localizing of the ictal onset zone in ictal EEG recordings. We extracted the potential distribution of the ictal activity from EEG using the higher order canonical decomposition method, also referred to as the CP model. The CP model decomposes in a unique way a higher order tensor in a minimal sum of rank-1 'atoms'. We showed that only one atom is related to the seizure activity. Simulation experiments demonstrated that the method correctly extracted the potential distribution of the ictal activity even with low signal-to-noise ratios. In 37 ictal EEGs, the CP method correctly localized the seizure onset zone in 34 (92%) and visual assessment in 21 cases (57%) (p=0.00024). The CP method is a fast method to delineate the ictal onset zone in ictal EEGs and is more sensitive than visual interpretation of the ictal EEGs.

Published
2006

36. Masses, lifetimes and production rates of Xi(-) and Xi(+) at LEP 1

Author

Abdallah, J. Abreu, P. Adam, W. Adzic, P. Albrecht, T. and Alderweireld, T. Alemany-Fernandez, R. Allmendinger, T. and Allport, P. P. Amaldi, U. Amapane, N. Amato, S. and Anashkin, E. Andreazza, A. Andringa, S. Anjos, N. and Antilogus, P. Apel, W. -D. Arnoud, Y. Ask, S. Asman, B. and Augustin, J. E. Augustinus, A. Baillon, P. Ballestrero, A. Bambade, P. Barbier, R. Bardin, D. Barker, G. J. and Baroncelli, A. Battaglia, M. Baubillier, M. Becks, K. -H. and Begalli, M. Behrmann, A. Ben-Haim, E. Benekos, N. and Benvenuti, A. Berat, C. Berggren, M. Berntzon, L. and Bertrand, D. Besancon, M. Besson, N. Bloch, D. Blom, M. and Bluj, M. Bonesini, M. Boonekamp, M. Booth, P. S. L. and Borisov, G. Botner, O. Bouquet, B. Bowcock, T. J. V. and Boyko, I. Bracko, M. Brenner, R. Brodet, E. Bruckman, P. and Brunet, J. M. Buschbeck, B. Buschmann, P. Calvi, M. and Camporesi, T. Canale, V. Carena, F. Castro, N. Cavallo, F. Chapkin, M. Charpentier, Ph. Checchia, P. Chierici, R. Chliapnikov, P. Chudoba, J. Chung, S. U. Cieslik, K. and Collins, P. Contri, R. Cosme, G. Cossutti, F. Costa, M. J. Crennell, D. Cuevas, J. D'Hondt, J. Dalmau, J. and da Silva, T. Da Silva, W. Della Ricca, G. De Angelis, A. and De Boer, W. De Clercq, C. De Lotto, B. De Maria, N. De Min, A. de Paula, L. Di Ciaccio, L. Di Simone, A. and Doroba, K. Drees, J. Eigen, G. Ekelof, T. Ellert, M. and Elsing, M. Santo, M. C. Espirito Fanourakis, G. and Fassouliotis, D. Feindt, M. Fernandez, J. Ferrer, A. and Ferro, F. Flagmeyer, U. Foeth, H. Fokitis, E. and Fulda-Quenzer, F. Fuster, J. Gandelman, M. Garcia, C. and Gavillet, Ph. Gazis, E. Gokieli, R. Golob, B. and Gomez-Ceballos, G. Goncalves, P. Graziani, E. Grosdidier, G. and Grzelak, K. Guy, J. Haag, C. Hallgren, A. Hamacher, K. Hamilton, K. Haug, S. Hauler, F. Hedberg, V. and Hennecke, M. Herr, H. Hoffman, J. Holmgren, S. -O. Holt, P. J. Houlden, M. A. Jackson, J. N. Jarlskog, G. Jarry, P. Jeans, D. Johansson, E. K. Johansson, P. D. Jonsson, P. Joram, C. Jungermann, L. Kapusta, F. Katsanevas, S. and Katsoufis, E. Kernel, G. Kersevan, B. P. Kerzel, U. and King, B. T. Kjaer, N. J. Kluit, P. Kokkinias, P. and Kourkoumelis, C. Kouznetsov, O. Krumstein, Z. Kucharczyk, M. and Lamsa, J. Leder, G. Ledroit, F. Leinonen, L. and Leitner, R. Lemonne, J. Lepeltier, V. Lesiak, T. Liebig, W. Liko, D. Lipniacka, A. Lopes, J. H. Lopez, J. M. and Loukas, D. Lutz, P. Lyons, L. MacNaughton, J. Malek, A. and Maltezos, S. Mandl, F. Marco, J. Marco, R. Marechal, B. Margoni, M. Marin, J. -C. Mariotti, C. Markou, A. and Martinez-Rivero, C. Masik, J. Mastroyiannopoulos, N. and Matorras, F. Matteuzzi, C. Mazzucato, F. Mazzucato, M. and Mc Nulty, R. Meroni, C. Migliore, E. Mitaroff, W. and Mjoernmark, U. Moa, T. Moch, M. Moenig, K. Monge, R. and Montenegro, J. Moraes, D. Moreno, S. Morettini, P. and Mueller, U. Muenich, K. Mulders, M. Mundim, L. Murray, W. Muryn, B. Myatt, G. Myklebust, T. Nassiakou, M. and Navarria, F. Nawrocki, K. Nicolaidou, R. Nikolenko, M. and Niss, P. Oblakowska-Mucha, A. Obraztsov, V. Olshevski, A. and Onofre, A. Orava, R. Osterberg, K. Ouraou, A. and Oyanguren, A. Paganoni, M. Paiano, S. Palacios, J. P. and Palka, H. Papadopoulou, Th. D. Pape, L. Parkes, C. and Parodi, F. Parzefall, U. Passeri, A. Passon, O. Peralta, L. Perepelitsa, V. Perrotta, A. Petrolini, A. Piedra, J. and Pieri, L. Pierre, F. Pimenta, M. Piotto, E. and Podobnik, T. Poireau, V. Pol, M. E. Polok, G. and Pozdniakov, V. Pukhaeva, N. Pullia, A. Rames, J. Read, A. Rebecchi, P. Rehn, J. Reid, D. Reinhardt, R. and Renton, P. Richard, F. Ridky, J. Rivero, M. Rodriguez, D. Romero, A. Ronchese, P. Roudeau, P. Rovelli, T. and Ruhlmann-Kleider, V. Ryabtchikov, D. Sadovsky, A. Salmi, L. and Salt, J. Sander, C. Savoy-Navarro, A. Schwickerath, U. and Sekulin, R. Siebel, M. Sisakian, A. Smadja, G. and Smirnova, O. Sokolov, A. Sopczak, A. Sosnowski, R. and Spassov, T. Stanitzki, M. Stocchi, A. Strauss, J. Stugu, B. Szczekowski, M. Szeptycka, M. Szumlak, T. Tabarelli, T. Taffard, A. C. Tegenfeldt, F. Timmermans, J. and Tkatchev, L. Tobin, M. Todorovova, S. Tome, B. Tonazzo, A. Tortosa, P. Travnicek, P. Treille, D. Tristram, G. and Trochimczuk, M. Troncon, C. Turluer, M. -L. Tyapkin, I. A. Tyapkin, P. Tzamarias, S. Uvarov, V. Valenti, G. and Van Dam, P. Van Eldik, J. Van Remortel, N. Van Vulpen, I. and Vegni, G. Veloso, F. Venus, W. Verdier, P. Verzi, V. and Vilanova, D. Vitale, L. Vrba, V. Wahlen, H. Walck, C. Washbrook, A. J. Weiser, C. Wicke, D. Wickens, J. and Wilkinson, G. Winter, M. Witek, M. Yushchenko, O. and Zalewska, A. Zalewski, P. Zavrtanik, D. Zhuravlov, V. and Zimin, N. I. Zintchenko, A. Zupan, M. DELPHI Collaboration

Abstract

Measurements of the Xi(-) and (Xi) over bar (+) masses, mass differences, lifetimes and lifetime differences are presented. The (Xi) over bar (+) sample used is much larger than those used previously for such measurements. In addition, the S production rates in Z -> b (b) over bar and Z -> q (q) over bar events are compared and the position xi* of the maximum of the distribution in Z -> q (q) over bar events is measured. (c) 2006 Elsevier B.V. All rights reserved.

Published
2006

37. A measurement of the tau hadronic branching ratios

Author

Abdallah, J. Abreu, P. Adam, W. Adzic, P. Albrecht, T. Alderweireld, T. Alemany-Fernandez, R. Allmendinger, T. Allport, P.P. Amaldi, U. Amapane, N. Amato, S. Anashkin, E. Andreazza, A. Andringa, S. Anjos, N. Antilogus, P. Apel, W.-D. Arnoud, Y. Ask, S. Asman, B. Augustin, J.E. Augustinus, A. Baillon, P. Ballestrero, A. Bambade, P. Barbier, R. Bardin, D. Barker, G.J. Baroncelli, A. Battaglia, M. Baubillier, M. Becks, K.-H. Begalli, M. Behrmann, A. Ben-Haim, E. Benekos, N. Benvenuti, A. Berat, C. Berggren, M. Berntzon, L. Bertrand, D. Besancon, M. Besson, N. Bloch, D. Blom, M. Bluj, M. Bonesini, M. Boonekamp, M. Booth, P.S.L. Borisov, G. Botner, O. Bouquet, B. Bowcock, T.J.V. Boyko, I. Bracko, M. Brenner, R. Brodet, E. Bruckman, P. Brunet, J.M. Bugge, L. Buschmann, P. Calvi, M. Camporesi, T. Canale, V. Carena, F. Castro, N. Cavallo, F. Chapkin, M. Charpentier, P. Checchia, P. Chierici, R. Chliapnikov, P. Chudoba, J. Chung, S.U. Cieslik, K. Collins, P. Contri, R. Cosme, G. Cossutti, F. Costa, M.J. Crennell, D. Cuevas, J. D'Hondt, J. Dalmau, J. da Silva, T. da Silva, W. della Ricca, G. de Angelis, A. de Boer, W. de Clercq, C. de Lotto, B. de Maria, N. de Min, A. de Paula, L. di Ciaccio, L. di Simone, A. Doroba, K. Drees, J. Dris, M. Eigen, G. Ekelof, T. Ellert, M. Elsing, M. Espirito Santo, M.C. Fanourakis, G. Fassouliotis, D. Feindt, M. Fernandez, J. Ferrer, A. Ferro, F. Flagmeyer, U. Foeth, H. Fokitis, E. Fulda-Quenzer, F. Fuster, J. Gandelman, M. Garcia, C. Gavillet, P. Gazis, E. Gokieli, R. Golob, B. Gomez-Ceballos, G. Goncalves, P. Graziani, E. Grosdidier, G. Grzelak, K. Guy, J. Haag, C. Hallgren, A. Hamacher, K. Hamilton, K. Haug, S. Hauler, F. Hedberg, V. Hennecke, M. Herr, H. Hoffman, J. Holmgren, S.-O. Holt, P.J. Houlden, M.A. Hultqvist, K. Jackson, J.N. Jarlskog, G. Jarry, P. Jeans, D. Johansson, E.K. Johansson, P.D. Jonsson, P. Joram, C. Jungermann, L. Kapusta, F. Katsanevas, S. Katsoufis, E. Kernel, G. Kersevan, B.P. Kerzel, U. Kiiskinen, A. King, B.T. Kjaer, N.J. Kluit, P. Kokkinias, P. Kourkoumelis, C. Kouznetsov, O. Krumstein, Z. Kucharczyk, M. Lamsa, J. Leder, G. Ledroit, F. Leinonen, L. Leitner, R. Lemonne, J. Lepeltier, V. Lesiak, T. Liebig, W. Liko, D. Lipniacka, A. Lopes, J.H. Lopez, J.M. Loukas, D. Lutz, P. Lyons, L. MacNaughton, J. Malek, A. Maltezos, S. Mandl, F. Marco, J. Marco, R. Marechal, B. Margoni, M. Marin, J.-C. Mariotti, C. Markou, A. Martinez-Rivero, C. Masik, J. Mastroyiannopoulos, N. Matorras, F. Matteuzzi, C. Mazzucato, F. Mazzucato, M. Mc Nulty, R. Meroni, C. Migliore, E. Mitaroff, W. Mjoernmark, U. Moa, T. Moch, M. Moenig, K. Monge, R. Montenegro, J. Moraes, D. Moreno, S. Morettini, P. Mueller, U. Muenich, K. Mulders, M. Mundim, L. Murray, W. Muryn, B. Myatt, G. Myklebust, T. Nassiakou, M. Navarria, F. Nawrocki, K. Nicolaidou, R. Nikolenko, M. Oblakowska-Mucha, A. Obraztsov, V. Olshevski, A. Onofre, A. Orava, R. Osterberg, K. Ouraou, A. Oyanguren, A. Paganoni, M. Paiano, S. Palacios, J.P. Palka, H. Papadopoulou, T.D. Pape, L. Parkes, C. Parodi, F. Parzefall, U. Passeri, A. Passon, O. Peralta, L. Perepelitsa, V. Perrotta, A. Petrolini, A. Piedra, J. Pieri, L. Pierre, F. Pimenta, M. Piotto, E. Podobnik, T. Poireau, V. Pol, M.E. Polok, G. Pozdniakov, V. Pukhaeva, N. Pullia, A. Rames, J. Read, A. Rebecchi, P. Rehn, J. Reid, D. Reinhardt, R. Renton, P. Richard, F. Ridky, J. Rivero, M. Rodriguez, D. Romero, A. Ronchese, P. Roudeau, P. Rovelli, T. Ruhlmann-Kleider, V. Ryabtchikov, D. Sadovsky, A. Salmi, L. Salt, J. Sander, C. Savoy-Navarro, A. Schwickerath, U. Segar, A. Sekulin, R. Siebel, M. Sisakian, A. Smadja, G. Smirnova, O. Sokolov, A. Sopczak, A. Sosnowski, R. Spassov, T. Stanitzki, M. Stocchi, A. Strauss, J. Stugu, B. Szczekowski, M. Szeptycka, M. Szumlak, T. Tabarelli, T. Taffard, A.C. Tegenfeldt, F. Timmermans, J. Tkatchev, L. Tobin, M. Todorovova, S. Tome, B. Tonazzo, A. Tortosa, P. Travnicek, P. Treille, D. Tristram, G. Trochimczuk, M. Troncon, C. Turluer, M.-L. Tyapkin, I.A. Tyapkin, P. Tzamarias, S. Uvarov, V. Valenti, G. van Dam, P. van Eldik, J. van Lysebetten, A. van Remortel, N. van Vulpen, I. Vegni, G. Veloso, F. Venus, W. Verdier, P. Verzi, V. Vilanova, D. Vitale, L. Vrba, V. Wahlen, H. Washbrook, A.J. Weiser, C. Wicke, D. Wickens, J. Wilkinson, G. Winter, M. Witek, M. Yushchenko, O. Zalewska, A. Zalewski, P. Zavrtanik, D. Zhuravlov, V. Zimin, N.I. Zintchenko, A. Zupan, M.

Abstract

The exclusive and semi-exclusive branching ratios of the τ lepton hadronic decay modes (h-ντ, h -π0ντ, h-π 0π0ντ, h- ≥2π0ντ, h -≥3π0ντ, 2h-h + ≥ντ, 3h-2h+ν τ, and 3h-2h+ ≥ 1π0ν τ) were measured with data from the DELPHI detector at LEP.

Published
2006

38. Search for neutral MSSM Higgs bosons at LEP

Author

Schael, S. Barate, R. Bruneliére, R. de Bonis, I. Decamp, D. Goy, C. Jézéquel, S. Lees, J.-P. Martin, F. Merle, E. Minard, M.-N. Pietrzyk, B. Trocmé, B. Bravo, S. Casado, M.P. Chmeissani, M. Crespo, J.M. Fernandez, E. Fernandez-Bosman, M. Garrido, L. Martinez, M. Pacheco, A. Ruiz, H. Colaleo, A. Creanza, D. de Filippis, N. de Palma, M. Iaselli, G. Maggi, G. Maggi, M. Nuzzo, S. Ranieri, A. Raso, G. Ruggieri, F. Selvaggi, G. Silvestris, L. Tempesta, P. Tricomi, A. Zito, G. Huang, X. Lin, J. Ouyang, Q. Wang, T. Xie, Y. Xu, R. Xue, S. Zhang, J. Zhang, L. Zhao, W. Abbaneo, D. Barklow, T. Buchmüller, O. Cattaneo, M. Clerbaux, B. Drevermann, H. Forty, R.W. Frank, M. Gianotti, F. Hansen, J.B. Harvey, J. Hutchcroft, D.E. Janot, P. Jost, B. Kado, M. Mato, P. Moutoussi, A. Ranjard, F. Rolandi, L. Schlatter, D. Teubert, F. Valassi, A. Videau, I. Badaud, F. Dessagne, S. Falvard, A. Fayolle, D. Gay, P. Jousset, J. Michel, B. Monteil, S. Pallin, D. Pascolo, J.M. Perret, P. Hansen, J.D. Hansen, J.R. Hansen, P.H. Kraan, A.C. Nilsson, B.S. Kyriakis, A. Markou, C. Simopoulou, E. Vayaki, A. Zachariadou, K. Blondel, A. Brient, J.-C. Machefert, F. Rougé, A. Videau, H. Ciulli, V. Focardi, E. Parrini, G. Antonelli, A. Antonelli, M. Bencivenni, G. Bossi, F. Capon, G. Cerutti, F. Chiarella, V. Mannocchi, G. Laurelli, P. Mannocchi, G. Murtas, G.P. Passalacqua, L. Kennedy, J. Lynch, J.G. Negus, P. O'Shea, V. Thompson, A.S. Wasserbaech, S. Cavanaugh, R. Dhamotharan, S. Geweniger, C. Hanke, P. Hepp, V. Kluge, E.E. Putzer, A. Stenzel, H. Tittel, K. Wunsch, M. Beuselinck, R. Cameron, W. Davies, G. Dornan, P.J. Girone, M. Marinelli, N. Nowell, J. Rutherford, S.A. Sedgbeer, J.K. Thompson, J.C. White, R. Ghete, V.M. Girtler, P. Kneringer, E. Kuhn, D. Rudolph, G. Bouhova-Thacker, E. Bowdery, C.K. Clarke, D.P. Ellis, G. Finch, A.J. Foster, F. Hughes, G. Jones, R.W.L. Pearson, M.R. Robertson, N.A. Smizanska, M. van der Aa, O. Delaere, C. Leibenguth, G. Lemaitre, V. Blumenschein, U. Holldorfer, F. Jakobs, K. Kayser, F. Müller, A.-S. Renk, B. Sander, H.-G. Schmeling, S. Wachsmuth, H. Zeitnitz, C. Ziegler, T. Bonissent, A. Coyle, P. Curtil, C. Ealet, A. Fouchez, D. Payre, P. Tilquin, A. Ragusa, F. David, A. Dietl, H. Ganis, G. Hüttmann, K. Lütjens, G. Männer, W. Moser, H.-G. Settles, R. Villegas, M. Wolf, G. Boucrot, J. Callot, O. Davier, M. Duflot, L. Grivaz, J.-F. Heusse, P. Jacholkowska, A. Serin, L. Veillet, J.-J. Azzurri, P. Bagliesi, G. Boccali, T. Foà, L. Giammanco, A. Giassi, A. Ligabue, F. Messineo, A. Palla, F. Sanguinetti, G. Sciabà, A. Sguazzoni, G. Spagnolo, P. Tenchini, R. Venturi, A. Verdini, P.G. Awunor, O. Blair, G.A. Cowan, G. Garcia-Bellido, A. Green, M.G. Medcalf, T. Misiejuk, A. Strong, J.A. Teixeira-Dias, P. Clifft, R.W. Edgecock, T.R. Norton, P.R. Tomalin, I.R. Ward, J.J. Bloch-Devaux, B. Boumediene, D. Colas, P. Fabbro, B. Lancon, E. Lemaire, M.-C. Locci, E. Perez, P. Rander, J. Tuchming, B. Vallage, B. Litke, A.M. Tayíor, G. Booth, C.N. Cartwright, S. Combley, F. Hodgson, P.N. Lehto, M. Thompson, L.F. Böhrer, A. Brandt, S. Grupen, C. Hess, J. Ngac, A. Prange, G. Borean, C. Giannini, G. He, H. Putz, J. Rothberg, J. Armstrong, S.R. Berkelman, K. Cranmer, K. Ferguson, D.P.S. Gao, Y. González, S. Hayes, O.J. Hu, H. Jin, S. Kile, J. McNamara, P.A. Nielsen, J. Pan, Y.B. von Wimmersperg-Toeller, J.H. Wiedenmann, W. Wu, J. Wu, S.L. Wu, X. Zobernig, G. Dissertori, G. Abdallah, J. Abreu, P. Adam, W. Adzic, P. Albrecht, T. Alderweireld, T. Alemany-Fernandez, R. Allmendinger, T. Allport, P.P. Amaldi, U. Amapane, N. Amato, S. Anashkin, E. Andreazza, A. Andringa, S. Anjos, N. Antilogus, P. Apel, W.-D. Arnoud, Y. Ask, S. Asman, B. Augustin, J.E. Augustinus, A. Baillon, P. Ballestrero, A. Bambade, P. Barbier, R. Bardin, D. Barker, G.J. Baroncelli, A. Battaglia, M. Baubillier, M. Becks, K.-H. Begalli, M. Behrmann, A. Ben-Haim, E. Benekos, N. Benvenuti, A. Berat, C. Berggren, M. Berntzon, L. Bertrand, D. Besancon, M. Besson, N. Bloch, D. Blom, M. Bluj, M. Bonesini, M. Boonekamp, M. Booth, P.S.L. Borisov, G. Botner, O. Bouquet, B. Bowcock, T.J.V. Boyko, I. Bracko, M. Brenner, R. Brodet, E. Bruckman, P. Brunet, J.M. Buschbeck, B. Buschmann, P. Calvi, M. Camporesi, T. Canale, V. Carena, F. Castro, N. Cavallo, F. Chapkin, M. Charpentier, P. Checchia, P. Chierici, R. Chliapnikov, P. Chudoba, J. Chung, S.U. Cieslik, K. Collins, P. Contri, R. Cosme, G. Cossutti, F. Costa, M.J. Crennell, D. Cuevas, J. D'Hondt, J. Dalmau, J. da Silva, T. da Silva, W. della Ricca, G. de Angelis, A. de Boer, W. de Clercq, C. de Lotto, B. de Maria, N. de Min, A. de Paula, L. di Ciaccio, L. di Simone, A. Doroba, K. Drees, J. Eigen, G. Ekelof, T. Ellert, M. Elsing, M. Espirito Santo, M.C. Fanourakis, G. Fassouliotis, D. Feindt, M. Fernandez, J. Ferrer, A. Ferro, F. Flagmeyer, U. Foeth, H. Fokitis, E. Fulda-Quenzer, F. Fuster, J. Gandelman, M. Garcia, C. Gavillet, P. Gazis, E. Gokieli, R. Golob, B. Gomez-Ceballos, G. Goncalves, P. Graziani, E. Grosdidier, G. Grzelak, K. Guy, J. Haag, C. Hallgren, A. Hamacher, K. Hamilton, K. Haug, S. Hauler, F. Hedberg, V. Hennecke, M. Herr, H. Hoffman, J. Holmgren, S.-O. Holt, P.J. Houlden, M.A. Hultqvist, K. Jackson, J.N. Jarlskog, G. Jarry, P. Jeans, D. Johansson, E.K. Johansson, P.D. Jonsson, P. Joram, C. Jungermann, L. Kapusta, F. Katsanevas, S. Katsoufis, E. Kernel, G. Kersevan, B.P. Kerzel, U. King, B.T. Kjaer, N.J. Kluit, P. Kokkinias, P. Kourkoumelis, C. Kouznetsov, O. Krumstein, Z. Kucharczyk, M. Lamsa, J. Leder, G. Ledroit, F. Leinonen, L. Leitner, R. Lemonne, J. Lepeltier, V. Lesiak, T. Liebig, W. Liko, D. Lipniacka, A. Lopes, J.H. Lopez, J.M. Loukas, D. Lutz, P. Lyons, L. MacNaughton, J. Malek, A. Maltezos, S. Mandl, F. Marco, J. Marco, R. Marechal, B. Margoni, M. Marin, J.-C. Mariotti, C. Markou, A. Martinez-Rivero, C. Masik, J. Mastroyiannopoulos, N. Matorras, F. Matteuzzi, C. Mazzucato, F. Mazzucato, M. Mc Nulty, R. Meroni, C. Migliore, E. Mitaroff, W. Mjoernmark, U. Moa, T. Moch, M. Moenig, K. Monge, R. Montenegro, J. Moraes, D. Moreno, S. Morettini, P. Mueller, U. Muenich, K. Mulders, M. Mundim, L. Murray, W. Muryn, B. Myatt, G. Myklebust, T. Nassiakou, M. Navarria, F. Nawrocki, K. Nicolaidou, R. Nikolenko, M. Oblakowska-Mucha, A. Obraztsov, V. Olshevski, A. Onofre, A. Orava, R. Osterberg, K. Ouraou, A. Oyanguren, A. Paganoni, M. Paiano, S. Palacios, J.P. Palka, H. Papadopoulou, T.D. Pape, L. Parkes, C. Parodi, F. Parzefall, U. Passeri, A. Passon, O. Peralta, L. Perepelitsa, V. Perrotta, A. Petrolini, A. Piedra, J. Pieri, L. Pierre, F. Pimenta, M. Piotto, E. Podobnik, T. Poireau, V. Pol, M.E. Polok, G. Pozdniakov, V. Pukhaeva, N. Pullia, A. Rames, J. Read, A. Rebecchi, P. Rehn, J. Reid, D. Reinhardt, R. Renton, P. Richard, F. Ridky, J. Rivero, M. Rodriguez, D. Romero, A. Ronchese, P. Roudeau, P. Rovelli, T. Ruhlmann-Kleider, V. Ryabtchikov, D. Sadovsky, A. Salmi, L. Salt, J. Sander, C. Savoy-Navarro, A. Schwickerath, U. Segar, A. Sekulin, R. Siebel, M. Sisakian, A. Smadja, G. Smirnova, O. Sokolov, A. Sopczak, A. Sosnowski, R. Spassov, T. Stanitzki, M. Stocchi, A. Strauss, J. Stugu, B. Szczekowski, M. Szeptycka, M. Szumlak, T. Tabarelli, T. Taffard, A.C. Tegenfeldt, F. Timmermans, J. Tkatchev, L. Tobin, M. Todorovova, S. Tome, B. Tonazzo, A. Tortosa, P. Travnicek, P. Treille, D. Tristram, G. Trochimczuk, M. Troncon, C. Turluer, M.-L. Tyapkin, I.A. Tyapkin, P. Tzamarias, S. Uvarov, V. Valenti, G. van Dam, P. van Eldik, J. van Remortel, N. van Vulpen, I. Vegni, G. Veloso, F. Venus, W. Verdier, P. Verzi, V. Vilanova, D. Vitale, L. Vrba, V. Wahlen, H. Washbrook, A.J. Weiser, C. Wicke, D. Wickens, J. Wilkinson, G. Winter, M. Witek, M. Yushchenko, O. Zalewska, A. Zalewski, P. Zavrtanik, D. Zhuravlov, V. Zimin, N.I. Zintchenko, A. Zupan, M. Achard, P. Adriani, O. Aguilar-Benitez, M. Alcaraz, J. Alemanni, G. Allaby, J. Aloisio, A. Alviggi, M.G. Anderhub, H. Andreev, V.P. Anselmo, F. Arefiev, A. Azemoon, T. Aziz, T. Bagnaia, P. Bajo, A. Baksay, G. Baksay, L. Baldew, S.V. Banerjee, S. Banerjee, S.W. Barczyk, A. Barillere, R. Bartalini, P. Basile, M. Batalova, N. Battiston, R. Bay, A. Becattini, F. Becker, U. Behner, F. Bellucci, L. Berbeco, R. Berdugo, J. Berges, P. Bertucci, B. Betev, B.L. Biasini, M. Biglietti, M. Biland, A. Blaising, J.J. Blyth, S.C. Bobbink, G.J. Bohm, A. Boldizsar, L. Borgia, B. Bottai, S. Bourilkov, D. Bourquin, M. Braccini, S. Branson, J.G. Brochu, F. Burger, J.D. Burger, W.J. Cai, X.D. Capell, M. Cara Romeo, G. Carlino, G. Cartacci, A. Casaus, J. Cavallari, F. Cavallo, N. Cecchi, C. Cerrada, M. Chamizo, M. Chang, Y.H. Chemarin, M. Chen, A. Chen, G. Chen, G.M. Chen, H.F. Chen, H.S. Chiefari, G. Cifarelli, L. Cindolo, F. Clare, I. Clare, R. Coignet, G. Colino, N. Costantini, S. de la Cruz, B. Cucciarelli, S. de Asmundis, R. Deglon, P. Debreczeni, J. Degre, A. Dehmelt, K. Deiters, K. della Volpe, D. Delmeire, E. Denes, P. DeNotaristefani, F. de Salvo, A. Diemoz, M. Dierckxsens, M. Dionisi, C. Dittmar, M. Doria, A. Dova, M.T. Duchesneau, D. Duda, M. Echenard, B. Eline, A. El Hage, A. El Mamouni, H. Engler, A. Eppling, F.J. Extermann, P. Falagan, M.A. Falciano, S. Favara, A. Fay, J. Fedin, O. Felcini, M. Ferguson, T. Fesefeldt, H. Fiandrini, E. Field, J.H. Filthaut, F. Fisher, P.H. Fisher, W. Forconi, G. Freudenreich, K. Furetta, C. Galaktionov, Yu. Ganguli, S.N. Garcia-Abia, P. Gataullin, M. Gentile, S. Giagu, S. Gong, Z.F. Grenier, G. Grimm, O. Gruenewald, M.W. Guida, M. Gupta, V.K. Gurtu, A. Gutay, L.J. Haas, D. Hatzifotiadou, D. Hebbeker, T. Hervé, A. Hirschfelder, J. Hofer, H. Hohlmann, M. Holzner, G. Hou, S.R. Hu, J. Jin, B.N. Jindal, P. Jones, L.W. de Jong, P. Josa-Mutuberría, I. Kaur, M. Kienzle-Focacci, M.N. Kim, J.K. Kirkby, J. Kittel, W. Klimentov, A. Konig, A.C. Kopal, M. Koutsenko, V. Kräber, M. Kraemer, R.W. Krüger, A. Kunin, A. Ladron de Guevara, P. Laktineh, I. Landi, G. Lebeau, M. Lebedev, A. Lebrun, P. Lecomte, P. Lecoq, P. Le Coultre, P. Le Goff, J.M. Leiste, R. Levtchenko, M. Levtchenko, P. Li, C. Likhoded, S. Lin, C.H. Lin, W.T. Linde, F.L. Lista, L. Liu, Z.A. Lohmann, W. Longo, E. Lu, Y.S. Luci, C. Luminari, L. Lustermann, W. Ma, W.G. Malgeri, L. Malinin, A. Ma na, C. Mans, J. Martin, J.P. Marzano, F. Mazumdar, K. McNeil, R.R. Mele, S. Merola, L. Meschini, M. Metzger, W.J. Mihul, A. Milcent, H. Mirabelli, G. Mnich, J. Mohanty, G.B. Muanza, G.S. Muijs, A.J.M. Musicar, B. Musy, M. Nagy, S. Natale, S. Napolitano, M. Nessi-Tedaldi, F. Newman, H. Nisati, A. Novak, T. Nowak, H. Ofierzynski, R. Organtini, G. Pal, I. Palomares, C. Paolucci, P. Paramatti, R. Passaleva, G. Patricelli, S. Paul, T. Pauluzzi, M. Paus, C. Pauss, F. Pedace, M. Pensotti, S. Perret-Gallix, D. Piccolo, D. Pierella, F. Pieri, M. Pioppi, M. Piroue, P.A. Pistolesi, E. Plyaskin, V. Pohl, M. Pojidaev, V. Pothier, J. Prokofiev, D. Rahal-Callot, G. Rahaman, M.A. Raics, P. Raja, N. Ramelli, R. Rancoita, P.G. Ranieri, R. Raspereza, A. Razis, P. Rembeczki, S. Ren, D. Rescigno, M. Reucroft, S. Riemann, S. Riles, K. Roe, B.P. Romero, L. Rosca, A. Rosemann, C. Rosenbleck, C. Rosier-Lees, S. Roth, S. Rubio, J.A. Ruggiero, G. Rykaczewski, H. Sakharov, A. Saremi, S. Sarkar, S. Salicio, J. Sanchez, E. Schafer, C. Schegelsky, V. Schopper, H. Schotanus, D.J. Sciacca, C. Servoli, L. Shevchenko, S. Shivarov, N. Shoutko, V. Shumilov, E. Shvorob, A. Son, D. Souga, C. Spillantini, P. Steuer, M. Stickland, D.P. Stoyanov, B. Straessner, A. Sudhakar, K. Sultanov, G. Sun, L.Z. Sushkov, S. Suter, H. Swain, J.D. Szillasi, Z. Tang, X.W. Tarjan, P. Tauscher, L. Taylor, L. Tellili, B. Teyssier, D. Timmermans, C. Ting, S.C.C. Ting, S.M. Tonwar, S.C. Tóth, J. Tully, C. Tung, K.L. Ulbricht, J. Valente, E. van de Walle, R.T. Vasquez, R. Vesztergombi, G. Vetlitsky, I. Viertel, G. Vivargent, M. Vlachos, S. Vodopianov, I. Vogel, H. Vogt, H. Vorobiev, I. Vorobyov, A.A. Wadhwa, M. Wang, Q. Wang, X.L. Wang, Z.M. Weber, M. Wynhoff, S. Xia, L. Xu, Z.Z. Yamamoto, J. Yang, B.Z. Yang, C.G. Yang, H.J. Yang, M. Yeh, S.C. Zalite, A. Zalite, Y. Zhang, Z.P. Zhao, J. Zhu, G.Y. Zhu, R.Y. Zhuang, H.L. Zichichi, A. Zimmermann, B. Zoller, M. Abbiendi, G. Ainsley, C. Åkesson, P.F. Alexander, G. Allison, J. Amaral, P. Anagnostou, G. Anderson, K.J. Asai, S. Axen, D. Azuelos, G. Bailey, I. Barberio, E. Barillari, T. Barlow, R.J. Batley, R.J. Bechtle, P. Behnke, T. Bell, K.W. Bell, P.J. Bella, G. Bellerive, A. Benelli, G. Bethke, S. Biebel, O. Boeriu, O. Bock, P. Boutemeur, M. Braibant, S. Brigliadori, L. Brown, R.M. Buesser, K. Burckhart, H.J. Campana, S. Carnegie, R.K. Carter, A.A. Carter, J.R. Chang, C.Y. Charlton, D.G. Ciocca, C. Csilling, A. Cuffiani, M. Dado, S. de Jong, S. de Roeck, A. de Wolf, E.A. Desch, K. Dienes, B. Donkers, M. Dubbert, J. Duchovni, E. Duckeck, G. Duerdoth, I.P. Etzion, E. Fabbri, F. Feld, L. Ferrari, P. Fiedler, F. Fleck, I. Ford, M. Frey, A. Gagnon, P. Gary, J.W. Gascon-Shotkin, S.M. Gaycken, G. Geich-Gimbel, C. Giacomelli, G. Giacomelli, P. Giunta, M. Goldberg, J. Gross, E. Grunhaus, J. Gruwé, M. Günther, P.O. Gupta, A. Hajdu, C. Hamann, M. Hanson, G.G. Harel, A. Hauschild, M. Hawkes, C.M. Hawkings, R. Hemingway, R.J. Herten, G. Heuer, R.D. Hill, J.C. Hoffman, K. Horváth, D. Igo-Kemenes, P. Ishii, K. Jeremie, H. Jost, U. Jovanovic, P. Junk, T.R. Kanaya, N. Kanzaki, J. Karlen, D. Kawagoe, K. Kawamoto, T. Keeler, R.K. Kellogg, R.G. Kennedy, B.W. Kluth, S. Kobayashi, T. Kobel, M. Komamiya, S. Krámer, T. Krieger, P. von Krogh, J. Kruger, K. Kuhl, T. Kupper, M. Lafferty, G.D. Landsman, H. Lanske, D. Layter, J.G. Lellouch, D. Letts, J. Levinson, L. Lillich, J. Lloyd, S.L. Loebinger, F.K. Lu, J. Ludwig, A. Ludwig, J. Mader, W. Marcellini, S. Martin, A.J. Masetti, G. Mashimo, T. Mattig, P. McKenna, J. McPherson, R.A. Meijers, F. Menges, W. Merritt, F.S. Mes, H. Meyer, N. Michelini, A. Mihara, S. Mikenberg, G. Miller, D.J. Moed, S. Mohr, W. Mori, T. Mutter, A. Nagai, K. Nakamura, I. Nanjo, H. Neal, H.A. Nisius, R. O'Neale, S.W. Oh, A. Oreglia, M.J. Orito, S. Pahl, C. Pásztor, G. Pater, J.R. Pilcher, J.E. Pinfold, J. Plane, D.E. Poli, B. Pooth, O. Przybycien, M. Quadt, A. Rabbertz, K. Rembser, C. Renkel, P. Roney, J.M. Rozen, Y. Runge, K. Sachs, K. Saeki, T. Sarkisyan, E.K.G. Schaile, A.D. Schaile, O. Scharff-Hansen, P. Schieck, J. Schörner-Sadenius, T. Schroder, M. Schumacher, M. Scott, W.G. Seuster, R. Shears, T.G. Shen, B.C. Sherwood, P. Skuja, A. Smith, A.M. Sobie, R. Söldner-Rembold, S. Spano, F. Stahl, A. Strom, D. Ströhmer, R. Tarem, S. Tasevsky, M. Teuscher, R. Thomson, M.A. Torrence, E. Toya, D. Tran, P. Trigger, I. Trócsányi, Z. Tsur, E. Turner-Watson, M.F. Ueda, I. Ujvári, B. Vollmer, C.F. Vannerem, P. Vértesi, R. Verzocchi, M. Voss, H. Vossebeld, J. Ward, C.P. Ward, D.R. Watkins, P.M. Watson, A.T. Watson, N.K. Wells, P.S. Wengler, T. Wermes, N. Wilson, G.W. Wilson, J.A. Wolf, G. Wyatt, T.R. Yamashita, S. Zer-Zion, D. Zivkovic, L. Heinemeyer, S. Pilaftsis, A. Weiglein, G.

Subjects
High Energy Physics::Phenomenology, High Energy Physics::Experiment
Abstract

The four LEP collaborations, ALEPH, DELPHI, L3 and OPAL, have searched for the neutral Higgs bosons which are predicted by the Minimal Supersymmetric standard model (MSSM). The data of the four collaborations are statistically combined and examined for their consistency with the background hypothesis and with a possible Higgs boson signal. The combined LEP data show no significant excess of events which would indicate the production of Higgs bosons. The search results are used to set upper bounds on the cross-sections of various Higgs-like event topologies. The results are interpreted within the MSSM in a number of "benchmark" models, including CP-conserving and CP-violating scenarios. These interpretations lead in all cases to large exclusions in the MSSM parameter space. Absolute limits are set on the parameter tan β and, in some scenarios, on the masses of neutral Higgs bosons.

Published
2006

39. A determination of the centre-of-mass energy at LEP2 using radiative two-fermion events

Author

Abdallah, J. Abreu, P. Adam, W. Adzic, P. Albrecht, T. Alderweireld, T. Alemany-Fernandez, R. Allmendinger, T. Allport, P.P. Amaldi, U. Amapane, N. Amato, S. Anashkin, E. Andreazza, A. Andringa, S. Anjos, N. Antilogus, P. Apel, W.-D. Arnoud, Y. Ask, S. Asman, B. Augustin, J.E. Augustinus, A. Baillon, P. Ballestrero, A. Bambade, P. Barbier, R. Bardin, D. Barker, G.J. Baroncelli, A. Battaglia, M. Baubillier, M. Becks, K.-H. Begalli, M. Behrmann, A. Ben-Haim, E. Benekos, N. Benvenuti, A. Berat, C. Berggren, M. Berntzon, L. Bertrand, D. Besancon, M. Besson, N. Bloch, D. Blom, M. Bluj, M. Bonesini, M. Boonekamp, M. Booth, P.S.L. Borisov, G. Botner, O. Bouquet, B. Bowcock, T.J.V. Boyko, I. Bracko, M. Brenner, R. Brodet, E. Bruckman, P. Brunet, J.M. Buschbeck, B. Buschmann, P. Calvi, M. Camporesi, T. Canale, V. Carena, F. Castro, N. Cavallo, F. Chapkin, M. Charpentier, P. Checchia, P. Chierici, R. Chliapnikov, P. Chudoba, J. Chung, S.U. Cieslik, K. Collins, P. Contri, R. Cosme, G. Cossutti, F. Costa, M.J. Crennell, D. Cuevas, J. D'Hondt, J. Dalmau, J. da Silva, T. da Silva, W. della Ricca, G. de Angelis, A. de Boer, W. de Clercq, C. de Lotto, B. de Maria, N. de Min, A. de Paula, L. di Ciaccio, L. di Simone, A. Doroba, K. Drees, J. Eigen, G. Ekelof, T. Ellert, M. Elsing, M. Espirito Santo, M.C. Fanourakis, G. Fassouliotis, D. Feindt, M. Fernandez, J. Ferrer, A. Ferro, F. Flagmeyer, U. Foeth, H. Fokitis, E. Fulda-Quenzer, F. Fuster, J. Gandelman, M. Garcia, C. Gavillet, P. Gazis, E. Gokieli, R. Golob, B. Gomez-Ceballos, G. Goncalves, P. Graziani, E. Grosdidier, G. Grzelak, K. Guy, J. Haag, C. Hallgren, A. Hamacher, K. Hamilton, K. Haug, S. Hauler, F. Hedberg, V. Hennecke, M. Herr, H. Hoffman, J. Holmgren, S.-O. Holt, P.J. Houlden, M.A. Hultqvist, K. Jackson, J.N. Jarlskog, G. Jarry, P. Jeans, D. Johansson, E.K. Johansson, P.D. Jonsson, P. Joram, C. Jungermann, L. Kapusta, F. Katsanevas, S. Katsoufis, E. Kernel, G. Kersevan, B.P. Kerzel, U. King, B.T. Kjaer, N.J. Kluit, P. Kokkinias, P. Kourkoumelis, C. Kouznetsov, O. Krumstein, Z. Kucharczyk, M. Lamsa, J. Leder, G. Ledroit, F. Leinonen, L. Leitner, R. Lemonne, J. Lepeltier, V. Lesiak, T. Liebig, W. Liko, D. Lipniacka, A. Lopes, J.H. Lopez, J.M. Loukas, D. Lutz, P. Lyons, L. MacNaughton, J. Malek, A. Maltezos, S. Mandl, F. Marco, J. Marco, R. Marechal, B. Margoni, M. Marin, J.-C. Mariotti, C. Markou, A. Martinez-Rivero, C. Masik, J. Mastroyiannopoulos, N. Matorras, F. Matteuzzi, C. Mazzucato, F. Mazzucato, M. Mc Nulty, R. Meroni, C. Migliore, E. Mitaroff, W. Mjoernmark, U. Moa, T. Moch, M. Moenig, K. Monge, R. Montenegro, J. Moraes, D. Moreno, S. Morettini, P. Mueller, U. Muenich, K. Mulders, M. Mundim, L. Murray, W. Muryn, B. Myatt, G. Myklebust, T. Nassiakou, M. Navarria, F. Nawrocki, K. Nicolaidou, R. Nikolenko, M. Oblakowska-Mucha, A. Obraztsov, V. Olshevski, A. Onofre, A. Orava, R. Osterberg, K. Ouraou, A. Oyanguren, A. Paganoni, M. Paiano, S. Palacios, J.P. Palka, H. Papadopoulou, T.D. Pape, L. Parkes, C. Parodi, F. Parzefall, U. Passeri, A. Passon, O. Peralta, L. Perepelitsa, V. Perrotta, A. Petrolini, A. Piedra, J. Pieri, L. Pierre, F. Pimenta, M. Piotto, E. Podobnik, T. Poireau, V. Pol, M.E. Polok, G. Pozdniakov, V. Pukhaeva, N. Pullia, A. Rames, J. Read, A. Rebecchi, P. Rehn, J. Reid, D. Reinhardt, R. Renton, P. Richard, F. Ridky, J. Rivero, M. Rodriguez, D. Romero, A. Ronchese, P. Roudeau, P. Rovelli, T. Ruhlmann-Kleider, V. Ryabtchikov, D. Sadovsky, A. Salmi, L. Salt, J. Sander, C. Savoy-Navarro, A. Schwickerath, U. Segar, A. Sekulin, R. Siebel, M. Sisakian, A. Smadja, G. Smirnova, O. Sokolov, A. Sopczak, A. Sosnowski, R. Spassov, T. Stanitzki, M. Stocchi, A. Strauss, J. Stugu, B. Szczekowski, M. Szeptycka, M. Szumlak, T. Tabarelli, T. Taffard, A.C. Tegenfeldt, F. Timmermans, J. Tkatchev, L. Tobin, M. Todorovova, S. Tome, B. Tonazzo, A. Tortosa, P. Travnicek, P. Treille, D. Tristram, G. Trochimczuk, M. Troncon, C. Turluer, M.-L. Tyapkin, I.A. Tyapkin, P. Tzamarias, S. Uvarov, V. Valenti, G. van Dam, P. van Eldik, J. van Remortel, N. van Vulpen, I. Vegni, G. Veloso, F. Venus, W. Verdier, P. Verzi, V. Vilanova, D. Vitale, L. Vrba, V. Wahlen, H. Washbrook, A.J. Weiser, C. Wicke, D. Wickens, J. Wilkinson, G. Winter, M. Witek, M. Yushchenko, O. Zalewska, A. Zalewski, P. Zavrtanik, D. Zhuravlov, V. Zimin, N.I. Zintchenko, A. Zupan, M.

Subjects
High Energy Physics::Experiment
Abstract

Using e+e- → μ+μ -(γ) and e+e- → qq̄(γ) events radiative to the Z pole, DELPHI has determined the centre-of-mass energy, √s, using energy and momentum constraint methods. The results are expressed as deviations from the nominal LEP centre-of-mass energy, measured using other techniques. The results are found to be compatible with the LEP Energy Working Group estimates for a combination of the 1997 to 2000 data sets.

Published
2006

40. Determination of the b quark mass at the Mz scale with the DELPHI detector at LEP

Author

Abdallah, J. Abreu, P. Adam, W. Adzic, P. Albrecht, T. Alderweireld, T. Alemany-Fernandez, R. Allmendinger, T. Allport, P.P. Amaldi, U. Amapane, N. Amato, S. Anashkin, E. Andreazza, A. Andringa, S. Anjos, N. Antilogus, P. Apel, W.-D. Arnoud, Y. Ask, S. Asman, B. Augustin, J.E. Augustinus, A. Baillon, P. Ballestrero, A. Bambade, P. Barbier, R. Bardin, D. Barker, G.J. Baroncelli, A. Battaglia, M. Baubillier, M. Becks, K.-H. Begalli, M. Behrmann, A. Ben-Haim, E. Benekos, N. Benvenuti, A. Berat, C. Berggren, M. Berntzon, L. Bertrand, D. Besancon, M. Besson, N. Bloch, D. Blom, M. Bluj, M. Bonesini, M. Boonekamp, M. Booth, P.S.L. Borisov, G. Botner, O. Bouquet, B. Bowcock, T.J.V. Boyko, I. Bracko, M. Brenner, R. Brodet, E. Bruckman, P. Brunet, J.M. Buschmann, P. Calvi, M. Camporesi, T. Canale, V. Carena, F. Castro, N. Cavallo, F. Chapkin, M. Charpentier, P. Checchia, P. Chierici, R. Chliapnikov, P. Chudoba, J. Chung, S.U. Cieslik, K. Collins, P. Contri, R. Cosme, G. Cossutti, F. Costa, M.J. Crennell, D. Cuevas, J. D'Hondt, J. Dalmau, J. da Silva, T. da Silva, W. della Ricca, G. de Angelis, A. de Boer, W. de Clercq, C. de Lotto, B. de Maria, N. de Min, A. de Paula, L. di Ciaccio, L. di Simone, A. Doroba, K. Drees, J. Eigen, G. Ekelof, T. Ellert, M. Elsing, M. Espirito Santo, M.C. Fanourakis, G. Fassouliotis, D. Feindt, M. Fernandez, J. Ferrer, A. Ferro, F. Flagmeyer, U. Foeth, H. Fokitis, E. Fulda-Quenzer, F. Fuster, J. Gandelman, M. Garcia, C. Gavillet, P. Gazis, E. Gokieli, R. Golob, B. Gomez-Ceballos, G. Goncalves, P. Graziani, E. Grosdidier, G. Grzelak, K. Guy, J. Haag, C. Hallgren, A. Hamacher, K. Hamilton, K. Haug, S. Hauler, F. Hedberg, V. Hennecke, M. Herr, H. Hoffman, J. Holmgren, S.-O. Holt, P.J. Houlden, M.A. Hultqvist, K. Jackson, J.N. Jarlskog, G. Jarry, P. Jeans, D. Johansson, E.K. Johansson, P.D. Jonsson, P. Joram, C. Jungermann, L. Kapusta, F. Katsanevas, S. Katsoufis, E. Kernel, G. Kersevan, B.P. Kerzel, U. King, B.T. Kjaer, N.J. Kluit, P. Kokkinias, P. Kourkoumelis, C. Kouznetsov, O. Krumstein, Z. Kucharczyk, M. Lamsa, J. Leder, G. Ledroit, F. Leinonen, L. Leitner, R. Lemonne, J. Lepeltier, V. Lesiak, T. Liebig, W. Liko, D. Lipniacka, A. Lopes, J.H. Lopez, J.M. Loukas, D. Lutz, P. Lyons, L. MacNaughton, J. Malek, A. Maltezos, S. Mandl, F. Marco, J. Marco, R. Marechal, B. Margoni, M. Marin, J.-C. Mariotti, C. Markou, A. Martinez-Rivero, C. Masik, J. Mastroyiannopoulos, N. Matorras, F. Matteuzzi, C. Mazzucato, F. Mazzucato, M. Mc Nulty, R. Meroni, C. Migliore, E. Mitaroff, W. Mjoernmark, U. Moa, T. Moch, M. Moenig, K. Monge, R. Montenegro, J. Moraes, D. Moreno, S. Morettini, P. Mueller, U. Muenich, K. Mulders, M. Mundim, L. Murray, W. Muryn, B. Myatt, G. Myklebust, T. Nassiakou, M. Navarria, F. Nawrocki, K. Nicolaidou, R. Nikolenko, M. Oblakowska-Mucha, A. Obraztsov, V. Olshevski, A. Onoíre, A. Orava, R. Osterberg, K. Ouraou, A. Oyanguren, A. Paganoni, M. Paiano, S. Palacios, J.P. Palka, H. Papadopoulou, T.D. Pape, L. Parkes, C. Parodi, F. Parzeíall, U. Passeri, A. Passon, O. Peralta, L. Perepelitsa, V. Perrotta, A. Petrolini, A. Piedra, J. Pieri, L. Pierre, F. Pimenta, M. Piotto, E. Podobnik, T. Poireau, V. Pol, M.E. Polok, G. Pozdniakov, V. Pukhaeva, N. Pullia, A. Rames, J. Read, A. Rebecchi, P. Rehn, J. Reid, D. Reinhardt, R. Renton, P. Richard, F. Ridky, J. Rivero, M. Rodriguez, D. Romero, A. Ronchese, P. Roudeau, P. Rovelli, T. Ruhlmann-Kleider, V. Ryabtchikov, D. Sadovsky, A. Salmi, L. Salt, J. Sander, C. Savoy-Navarro, A. Schwickerath, U. Segar, A. Sekulin, R. Siebel, M. Sisakian, A. Smadja, G. Smirnova, O. Sokolov, A. Sopczak, A. Sosnowski, R. Spassov, T. Stanitzki, M. Stocchi, A. Strauss, J. Stugu, B. Szczekowski, M. Szeptycka, M. Szumlak, T. Tabarelli, T. Taffard, A.C. Tegeníeldt, F. Timmermans, J. Tkatchev, L. Tobin, M. Todorovova, S. Tome, B. Tonazzo, A. Tortosa, P. Travnicek, P. Treille, D. Tristram, G. Trochimczuk, M. Troncon, C. Turluer, M.-L. Tyapkin, I.A. Tyapkin, P. Tzamarias, S. Uvarov, V. Valenti, G. van Dam, P. van Eldik, J. van Remortel, N. van Vulpen, I. Vegni, G. Veloso, F. Venus, W. Verdier, P. Verzi, V. Vilanova, D. Vitale, L. Vrba, V. Wahlen, H. Washbrook, A.J. Weiser, C. Wicke, D. Wickens, J. Wilkinson, G. Winter, M. Witek, M. Yushchenko, O. Zalewska, A. Zalewski, P. Zavrtanik, D. Zhuravlov, V. Zimin, N.I. Zintchenko, A. Zupan, M.

Subjects
High Energy Physics::Experiment
Abstract

An experimental study of the normalized three-jet rate of b quark events with respect to light quarks events (light = l ≡ u,d,s) has been performed using the CAMBRIDGE and DURHAM jet algorithms. The data used were collected by the DELPHI experiment at LEP on the Z peak from 1994 to 2000. The results are found to agree with theoretical predictions treating mass corrections at next-to-leading order. Measurements of the b quark mass have also been performed for both the b pole mass: Mb and the b running mass: m b(MZ). Data are found to be better described when using the running mass. The measurement yields: mb(MZ) = 2.85±0.18(stat) ±0.13(exp)±0.19(had) ±0.12(theo) GeV/c2. for the CAMBRIDGE algorithm. This result is the most precise measurement of the b mass derived from a high energy process. When compared to other b mass determinations by experiments at lower energy scales, this value agrees with the prediction of quantum chromodynamics for the energy evolution of the running mass. The mass measurement is equivalent to a test of the flavour independence of the strong coupling constant with an accuracy of 7 ‰.

Published
2006

41. Measurement and interpretation of fermion-pair production at LEP energies above the Z resonance

Author

Abdallah, J. Abreu, P. Adam, W. Adzic, P. Albrecht, T. Alderweireld, T. Alemany-Fernandez, R. Allmendinger, T. Allport, P.P. Amaldi, U. Amapane, N. Amato, S. Anashkin, E. Andreazza, A. Andringa, S. Anjos, N. Antilogus, P. Apel, W.-D. Arnoud, Y. Ask, S. Asman, B. Augustin, J.E. Augustinus, A. Baillon, P. Ballestrero, A. Bambade, P. Barbier, R. Bardin, D. Barker, G.J. Baroncelli, A. Battaglia, M. Baubillier, M. Becks, K.-H. Begalli, M. Behrmann, A. Ben-Haim, E. Benekos, N. Benvenuti, A. Berat, C. Berggren, M. Berntzon, L. Bertrand, D. Besancon, M. Besson, N. Bloch, D. Blom, M. Bluj, M. Bonesini, M. Boonekamp, M. Booth, P.S.L. Borisov, G. Botner, O. Bouquet, B. Bowcock, T.J.V. Boyko, I. Bracko, M. Brenner, R. Brodet, E. Bruckman, P. Brunet, J.M. Buschmann, P. Calvi, M. Camporesi, T. Canale, V. Carena, F. Castro, N. Cavallo, F. Chapkin, M. Charpentier, P. Checchia, P. Chierici, R. Chliapnikov, P. Chudoba, J. Chung, S.U. Cieslik, K. Collins, P. Contri, R. Cosme, G. Cossutti, F. Costa, M.J. Crennell, D. Cuevas, J. D'Hondt, J. Dalmau, J. da Silva, T. da Silva, W. della Ricca, G. de Angelis, A. de Boer, W. de Clercq, C. de Lotto, B. de Maria, N. de Min, A. de Paula, L. di Ciaccio, L. di Simone, A. Doroba, K. Drees, J. Eigen, G. Ekelof, T. Ellert, M. Elsing, M. Espirito Santo, M.C. Fanourakis, G. Fassouliotis, D. Feindt, M. Fernandez, J. Ferrer, A. Ferro, F. Flagmeyer, U. Foeth, H. Fokitis, E. Fulda-Quenzer, F. Fuster, J. Gandelman, M. Garcia, C. Gavillet, P. Gazis, E. Gokieli, R. Golob, B. Gomez-Ceballos, G. Gocalves, P. Graziani, E. Grosdidier, G. Grzelak, K. Guy, J. Haag, C. Hallgren, A. Hamacher, K. Hamilton, K. Haug, S. Hauler, F. Hedberg, V. Hennecke, M. Herr, H. Hoffman, J. Holmgren, S.-O. Holt, P.J. Houlden, M.A. Hultqvist, K. Jackson, J.N. Jarlskog, G. Jarry, P. Jeans, D. Johansson, E.K. Johansson, P.D. Jonsson, P. Joram, C. Jungermann, L. Kapusta, F. Katsanevas, S. Katsoufis, E. Kernel, G. Kersevan, B.P. Kerzel, U. King, B.T. Kjaer, N.J. Kluit, P. Kokkinias, P. Kourkoumelis, C. Kouznetsov, O. Krumstein, Z. Kucharczyk, M. Lamsa, J. Leder, G. Ledroit, F. Leinonen, L. Leitner, R. Lemonne, J. Lepeltier, V. Lesiak, T. Liebig, W. Liko, D. Lipniacka, A. Lopes, J.H. Lopez, J.M. Loukas, D. Lutz, P. Lyons, L. MacNaughton, J. Malek, A. Maltezos, S. Mandl, F. Marco, J. Marco, R. Marechal, B. Margoni, M. Marin, J.-C. Mariotti, C. Markou, A. Martinez-Rivero, C. Masik, J. Mastroyiannopoulos, N. Matorras, F. Matteuzzi, C. Mazzucato, F. Mazzucato, M. Mc Nulty, R. Meroni, C. Migliore, E. Mitaroff, W. Mjoernmark, U. Moa, T. Moch, M. Moenig, K. Monge, R. Montenegro, J. Moraes, D. Moreno, S. Morettini, P. Mueller, U. Muenich, K. Mulders, M. Mundim, L. Murray, W. Muryn, B. Myatt, G. Myklebust, T. Nassiakou, M. Navarria, F. Nawrocki, K. Nicolaidou, R. Nikolaenko, V. Nikolenko, M. Oblakowska-Mucha, A. Obraztsov, V. Olshevski, A. Onofre, A. Orava, R. Osterberg, K. Ouraou, A. Oyanguren, A. Paganoni, M. Paiano, S. Palacios, J.P. Palka, H. Papadopoulou, T.D. Pape, L. Parkes, C. Parodi, F. Parzefall, U. Passeri, A. Passon, O. Peralta, L. Perepelitsa, V. Perrotta, A. Petrolini, A. Piedra, J. Pieri, L. Pierre, F. Pimenta, M. Piotto, E. Podobnik, T. Poireau, V. Pol, M.E. Polok, G. Pozdniakov, V. Pukhaeva, N. Pullia, A. Rames, J. Read, A. Rebecchi, P. Rehn, J. Reid, D. Reinhardt, R. Renton, P. Richard, F. Ridky, J. Rivero, M. Rodriguez, D. Romero, A. Ronchese, P. Roudeau, P. Rovelli, T. Ruhlmann-Kleider, V. Ryabtchikov, D. Sadovsky, A. Salmi, L. Salt, J. Sander, C. Savoy-Navarro, A. Schwickerath, U. Segar, A. Sekulin, R. Siebel, M. Sisakian, A. Smadja, G. Smirnova, O. Sokolov, A. Sopczak, A. Sosnowski, R. Spassov, T. Stanitzki, M. Stocchi, A. Strauss, J. Stugu, B. Szczekowski, M. Szeptycka, M. Szumlak, T. Tabarelli, T. Taffard, A.C. Tegenfeldt, F. Timmermans, J. Tkatchev, L. Tobin, M. Todorovova, S. Tome, B. Tonazzo, A. Tortosa, P. Travnicek, P. Treille, D. Tristram, G. Trochimczuk, M. Troncon, C. Turluer, M.-L. Tyapkin, I.A. Tyapkin, P. Tzamarias, S. Uvarov, V. Valenti, G. van Dam, P. van Eldik, J. van Remortel, N. van Vulpen, I. Vegni, G. Veloso, F. Venus, W. Verdier, P. Verzi, V. Vilanova, D. Vitale, L. Vrba, V. Wahlen, H. Washbrook, A.J. Weiser, C. Wicke, D. Wickens, J. Wilkinson, G. Winter, M. Witek, M. Yushchenko, O. Zalewska, A. Zalewski, P. Zavrtanik, D. Zhuravlov, V. Zimin, N.I. Zintchenko, A. Zupan, M.

Subjects
High Energy Physics::Experiment
Abstract

This paper presents DELPHI measurements and interpretations of cross-sections, forward-backward asymmetries, and angular distributions, for the e-e- → ff̄ process for centre-of-mass energies above the Z resonance, from √s ∼ 130-207 GeV at the LEP collider. The measurements are consistent with the predictions of the Standard Model and are used to study a variety of models including the S-Matrix ansatz for e -e- → ff̄ scattering and several models which include physics beyond the Standard Model: the exchange of Z′ bosons, contact interactions between fermions, the exchange of gravitons in large extra dimensions and the exchange of ṽ in R-parity violating supersymmetry.

Published
2006

42. Single intermediate vector boson production in e(+)e(-) collisions at root s=183-209 GeV

Author

Abdallah, J. Abreu, P. Adam, W. Adzic, P. Albrecht, T. and Alderweireld, T. Alemany-Fernandez, R. Allmendinger, T. and Allport, P. Amaldi, U. Amapane, N. Amato, S. Anashkin, E. Andreazza, A. Andringa, S. Anjos, N. Antilogus, P. and Apel, W. -D. Arnoud, Y. Ask, S. Asman, B. Augustin, E. Augustinus, A. Baillon, P. Ballestrero, A. Bambade, P. Barbier, R. Bardin, D. Barker, J. Baroncelli, A. and Battaglia, M. Baubillier, M. Becks, K. -H. Begalli, M. and Behrmann, A. Ben-Haim, E. Benekos, N. Benvenuti, A. and Berat, C. Berggren, M. Berntzon, L. Bertrand, D. and Besancon, M. Besson, N. Bloch, D. Blom, M. Bluj, M. and Bonesini, M. Boonekamp, M. Booth, L. Borisov, G. Botner, O. Bouquet, B. Bowcock, V. Boyko, I. Bracko, M. and Brenner, R. Brodet, E. Bruckman, P. Brunet, M. and Buschmann, P. Calvi, M. Camporesi, T. Canale, V. Carena, F. Castro, N. Cavallo, F. Chapkin, M. Charpentier, Ph. and Checchia, P. Chierici, R. Chliapnikov, P. Chudoba, J. and Chung, U. Cieslik, K. Collins, P. Contri, R. Cosme, G. Cossutti, F. Costa, J. Crennelll, D. Cuevas, J. and D'Hondt, J. Dalmau, J. da Silva, T. da Silva, W. Della Ricca, G. De Angelis, A. De Boer, W. De Clercq, C. De Lotto, B. De Maria, N. De Min, A. de Paula, L. Di Ciaccio, L. Di Simone, A. Doroba, K. Drees, J. Eigen, G. and Ekelof, T. Ellert, M. Elsing, M. Santo, C. Espirito and Fanourakis, G. Fassouliotis, D. Feindt, M. Fernandez, J. and Ferrero, A. Ferro, F. Flagmeyer, U. Foeth, H. Fokitis, E. Fulda-Quenzer, F. Fuster, J. Gandelman, M. Garcia, C. and Gavillet, Ph. Gazis, E. Gokieli, R. Golob, B. and Gomez-Ceballos, G. Goncalves, P. Graziani, E. Grosdidier, G. and Grzelak, K. Guy, J. Haag, C. Hallgren, A. Hamacher, K. Hamilton, K. Haug, S. Hauler, F. Hedberg, V. and Hennecke, M. Herr, H. Hoffman, J. Holmgren, S. -O. Holt, J. Houlden, A. Hultqvist, K. Jackson, N. Jarlskog, G. and Jarry, P. Jeans, D. Johansson, K. Johansson, D. and Jonsson, P. Joram, C. Jungermann, L. Kapusta, F. and Katsanevas, S. Katsoufis, E. Kernel, G. Kersevan, P. and Kerzel, U. King, T. Kjaer, J. Kluit, P. Kokkinias, P. and Kourkoumelis, C. Kouznetsov, O. Krumstein, Z. and Kucharczyk, M. Lamsa, J. Leder, G. Ledroit, F. Leinonen, L. Leitner, R. Lemonne, J. Lepeltier, V. Lesiak, T. and Liebig, W. Liko, D. Lipniacka, A. Lopes, H. Lopez, M. and Loukas, D. Lutz, P. Lyons, L. MacNaughton, J. Malek, A. Maltezos, S. Mandl, F. Marco, J. Marco, R. and Marechal, B. Margoni, M. Marin, J. -C. Mariotti, C. and Markou, A. Martinez-Rivero, C. Masik, J. Mastroyiannopoulos, N. Matorras, F. Matteuzzi, C. Mazzucato, F. Mazzucato, M. Mc Nulty, R. Meroni, C. Migliore, E. Mitaroff, W. and Mjoernmark, U. Moa, T. Moch, M. Moenig, K. Monge, R. and Montenegro, J. Moraes, D. Moreno, S. Morettini, P. and Mueller, U. Muenich, K. Mulders, M. Mundim, L. Murray, W. Muryn, B. Myatt, G. Myklebust, T. Nassiakou, M. and Navarria, F. Nawrocki, K. Nicolaidou, R. Nikolenko, M. and Oblakowska-Mucha, A. Obraztsov, V. Olshevski, A. Onofre, A. and Orava, R. Osterberg, K. Ouraou, A. Oyanguren, A. and Paganoni, M. Paiano, S. Palacios, P. Palka, H. and Papadopoulou, D. Pape, L. Parkes, C. Parodi, F. and Parzefall, U. Passeri, A. Passon, O. Peralta, L. and Perepelitsa, V. Perrotta, A. Petrolini, A. Piedra, J. and Pieri, L. Pierre, F. Pimenta, M. Piotto, E. Podobnik, T. and Poireau, V. Pol, E. Polok, G. Pozdniakov, V. and Pukhaeva, N. Pullia, A. Rames, J. Read, A. Rebecchi, P. and Rehn, J. Reid, D. Reinhardt, R. Renton, P. Richard, F. Ridky, J. Rivero, M. Rodriguez, D. Romero, A. and Ronchese, P. Roudeau, P. Rovelli, T. Ruhlmann-Kleider, V. and Ryabtchikov, D. Sadovsky, A. Salmi, L. Salt, J. and Sander, C. Savoy-Navarro, A. Schwickerath, U. Segar, A. and Sekulin, R. Siebel, M. Sisakian, A. Smadja, G. Smirnova, O. Sokolov, A. Sopczak, A. Sosnowski, R. Spassov, T. and Stanitzki, M. Stocchi, A. Strauss, J. Stugu, B. and Szczekowski, M. Szeptycka, M. Szumlak, T. Tabarelli, T. and Taffard, C. Tegenfeldt, F. Timmermans, J. Tkatchev, L. and Tobin, M. Todorovova, S. Tome, B. Tonazzo, A. Tortosa, P. Travnicek, P. Treille, D. Tristram, G. Trochimczuk, M. Troncon, C. Turluer, M. -L. Tyapkin, A. Tyapkin, P. and Tzamarias, S. Uvarov, V. Valenti, G. Van Dam, P. Van Eldik, J. van Remortel, N. Van Vulpen, I. Vegni, G. and Velos, F. Venus, W. Verdier, P. Verzi, V. Vilanova, D. and Vitale, L. Vrba, V. Wahlen, H. Washbrook, J. Weiser, C. Wicke, D. Wickens, J. Wilkinson, G. Winter, M. and Witek, M. Yushchenko, O. Zalewska, A. Zalewski, P. and Zavrtanik, D. Zhuravlov, V. Zimin, I. Zintchenko, A. and Zupan, M. DELPHI Collaboration

Subjects
High Energy Physics::Experiment, Nuclear Experiment
Abstract

The production of single charged and neutral intermediate vector bosons in e(+)e(-) collisions has been studied in the data collected by the DELPHI experiment at LEP at centre-of-mass energies between 183 and 209 GeV, corresponding to an integrated luminosity of about 640 pb(-1). The measured cross-sections for the reactions, determined in limited kinematic regions, are in agreement with the Standard Model predictions.

Published
2006

43. Search for eta(b) in two-photon collisions at LEP II with the DELPHI detector

Author

Abdallah, J Abreu, P Adam, W Adzic, P Albrecht, T and Alderweireld, T Alemany-Fernandez, R Allmendinger, T and Allport, PP Amaldi, U Amapane, N Amato, S Anashkin, E and Andreazza, A Andringa, S Anjos, N Antilogus, P Apel, WD Arnoud, Y Ask, S Asman, B Augustin, JE and Augustinus, A Baillon, P Ballestrero, A Bambade, P and Barbier, R Bardin, D Barker, GJ Baroncelli, A Battaglia, M Baubillier, M Barbier, R Bardin, D Barker, GJ and Baroncelli, A Battaglia, M Baubillier, M Becks, KH and Begalli, M Behrmann, A Ben-Haim, E Benekos, N Benvenuti, A Berat, C Berggren, M Berntzon, L Bertrand, D and Besancon, M Besson, N Bloch, D Blom, M Bluj, M and Bonesini, M Boonekamp, M Booth, PSL Borisov, G Botner, O and Bouquet, B Bowcock, TJV Boyko, I Bracko, M Brenner, R Brodet, E Bruckman, P Brunet, JM Buschmann, P and Calvi, M Camporesi, T Canale, V Carena, F Castro, N and Cavallo, F Chapkin, M Charpentier, P Checchia, P and Chierici, R Chliapnikov, P Chudoba, J Chung, SU Cieslik, K Collins, P Contri, R Cosme, G Cossutti, F Costa, MJ Crennell, D Cuevas, J D'Hondt, J Dalmau, J da Silva, T Da Silva, W Della Ricca, G De Angelis, A De Boer, W De Clercq, C De Lotto, B De Maria, N De Min, A and de Paula, L Di Ciaccio, L Di Simone, A Doroba, K and Drees, J Eigen, G Ekelof, T Ellert, M Elsing, M and Santo, MCE Fanourakis, G Fassouliotis, D Feindt, M and Fernandez, J Ferrer, A Ferro, F Flagmeyer, U Foeth, H and Fokitis, E Fulda-Quenzer, F Fuster, J Gandelman, M and Garcia, C Gavillet, P Gazis, E Gokieli, R Golob, B and Gomez-Ceballos, G Goncalves, R Graziani, E Grosdidier, G and Grzelak, K Guy, J Haag, C Hallgren, A Hamacher, K and Hamilton, K Haug, S Hauler, F Hedber, V Hennecke, M and Herr, H Hoffman, J Holmgren, SO Holt, PJ Houlden, MA and Hultqvist, K Jackson, JN Jarlskog, G Jarry, P Jeans, D and Johansson, EK Johansson, PD Jonsson, P Joram, C and Jungermann, L Kapusta, F Katsanevas, S Katsoufis, E and Kernel, G Kersevan, BP Kerzel, U King, BT Kjaer, NJ and Kluit, P Kokkinias, P Kourkoumelis, C Kouznetsov, O and Krumstein, Z Kucharczyk, M Lamsa, J Leder, G Ledroit, R and Leinonen, L Leitner, R Lemonne, J Lepeltier, V and Lesiak, T Liebig, W Liko, D Lipniacka, A Lopes, JH and Lopez, JM Loukas, D Lutz, P Lyons, L MacNaughton, J and Malek, A Maltezos, S Mandl, F Marco, J Marco, R and Marechal, B Margoni, M Marin, JC Mariotti, C Markou, A and Martinez-Rivero, C Masik, J Mastroyiannopoulos, N and Matorras, F Matteuzzi, C Mazzucato, F Mazzucato, M and McNulty, R Meroni, C Migliore, E Mitaroff, W Mjoernmark, U Moa, T Moch, M Moenig, K Monge, R Montenegro, J and Moraes, D Moreno, S Morettini, P Mueller, U Muenich, K Mulders, M Mundim, L Murray, W Muryn, B Myatt, G and Myklebust, T Nassiakou, M Navarria, F Nawrocki, K and Nicolaidou, R Nikolenko, M Oblakowska-Mucha, A Obraztsov, V and Olshevski, A Onofre, A Orava, R Osterberg, K Ouraou, A Oyanguren, A Paganoni, M Paiano, S Palacios, JP and Palka, H Papadopoulou, TD Pape, L Parkes, C Parodi, F and Parzefall, U Passeri, A Passon, O Peralta, L and Perepelitsa, V Perrotta, A Petrolini, A Piedra, J Pieri, L Pierre, F Pimenta, M Piotto, E Podobnik, T and Poireau, V Pol, ME Polok, G Pozdniakov, V Pukhaeva, N and Pullia, A Rames, J Read, A Rebecchi, P Rehn, J and Reid, D Reinhardt, R Renton, P Richard, F Ridky, J and Rivero, M Rodriguez, D Romero, A Ronchese, P Roudeau, R and Rovelli, T Ruhlmann-Kleider, V Ryabtchikov, D Sadovsky, A Salmi, L Salt, J Sander, C Savoy-Navarro, A and Schwickerath, U Segar, A Sekulin, R Siebel, M Sisakian, A Smadja, G Smirnova, O Sokolov, A Sopczak, A and Sosnowski, R Spassov, T Stanitzki, M Stocchi, A Strauss, J Stugu, B Szczekowski, M Szeptycka, M Szumlak, T and Tabarelli, T Taffard, AC Tegenfeldt, F Timmermans, J and Tkatchev, L Tobin, M Todorovova, S Tome, B Tonazzo, A and Tortosa, P Travnicek, P Treille, D Tristram, G and Trochimczuk, M Troncon, C Turluer, ML Tyapkin, IA and Tyapkin, P Tzamarias, S Uvarov, V Valenti, G Van Dam, P and Van Eldik, J van Remortel, N Van Vulpen, I Vegni, G and Veloso, R Venus, W Verdier, P Verzi, V Vilanova, D and Vitale, L Vrba, V Wahlen, H Washbrook, AJ Weiser, C and Wicke, D Wickens, J Wilkinson, G Winter, M Witek, M and Yushchenko, O Zalewska, A Zalewski, P Zavrtanik, D and Zhuravlov, V Zimin, NI Zintchenko, A Zupan, M

Subjects
High Energy Physics::Experiment, Nuclear Experiment
Abstract

The pseudoscalar meson eta(b) has been searched for in two-photon interactions at LEP II. The data sample corresponds to a total integrated luminosity of 617 pb(-1) at centre-of-mass energies ranging from 161 to 209 GeV. Upper limits at a confidence level of 95% on the product Gamma(gamma gamma) (eta(b)) x BR(eta(b)) are 190, 470 and 660 eV/c(2) for the eta(b) decaying into 4, 6 and 8 charged particles, respectively. (c) 2006 Published by Elsevier B.V.

Published
2006

44. Search for excited leptons in e+e- collisions at √s = 189-209 GeV

Author

Abdallah, J. Abreu, P. Adam, W. Adzic, P. Albrecht, T. Alderweireld, T. Alemany-Fernandez, R. Allmendinger, T. Allport, P.P. Amaldi, U. Amapane, N. Amato, S. Anashkin, E. Andreazza, A. Andringa, S. Anjos, N. Antilogus, P. Apel, W.-D. Arnoud, Y. Ask, S. Asman, B. Augustin, J.E. Augustinus, A. Baillon, P. Ballestrero, A. Bambade, P. Barbier, R. Bardin, D. Barker, G.J. Baroncelli, A. Battaglia, M. Baubillier, M. Becks, K.-H. Begalli, M. Behrmann, A. Ben-Haim, E. Benekos, N. Benvenuti, A. Berat, C. Berggren, M. Berntzon, L. Bertrand, D. Besancon, M. Besson, N. Bloch, D. Blom, M. Bluj, M. Bonesini, M. Boonekamp, M. Booth, P.S.L. Borisov, G. Botner, O. Bouquet, B. Bowcock, T.J.V. Boyko, I. Bracko, M. Brenner, R. Brodet, E. Bruckman, P. Brunet, J.M. Bugge, L. Buschmann, P. Calvi, M. Camporesi, T. Canale, V. Carena, F. Castro, N. Cavallo, F. Chapkin, M. Charpentier, P. Checchia, P. Chierici, R. Chliapnikov, P. Chudoba, J. Chung, S.U. Cieslik, K. Collins, P. Contri, R. Cosme, G. Cossutti, F. Costa, M.J. Crennell, D. Cuevas, J. D'Hondt, J. Dalmau, J. da Silva, T. da Silva, W. della Ricca, G. de Angelis, A. de Boer, W. de Clercq, C. de Lotto, B. de Maria, N. de Min, A. de Paula, L. di Ciaccio, L. di Simone, A. Doroba, K. Drees, J. Dris, M. Eigen, G. Ekelof, T. Ellert, M. Elsing, M. Espirito Santo, M.C. Fanourakis, G. Fassouliotis, D. Feindt, M. Fernandez, J. Ferrer, A. Ferro, F. Flagmeyer, U. Foeth, H. Fokitis, E. Fulda-Quenzer, F. Fuster, J. Gandelman, M. Garcia, C. Gavillet, P. Gazis, E. Gokieli, R. Golob, B. Gomez-Ceballos, G. Goncalves, P. Graziani, E. Grosdidier, G. Grzelak, K. Guy, J. Haag, C. Hallgren, A. Hamacher, K. Hamilton, K. Haug, S. Hauler, F. Hedberg, V. Hennecke, M. Herr, H. Hoffman, J. Holmgren, S.-O. Holt, P.J. Houlden, M.A. Hultqvist, K. Jackson, J.N. Jarlskog, G. Jarry, P. Jeans, D. Johansson, E.K. Johansson, P.D. Jonsson, P. Joram, C. Jungermann, L. Kapusta, F. Katsanevas, S. Katsoufis, E. Kernel, G. Kersevan, B.P. Kerzel, U. Kiiskinen, A. King, B.T. Kjaer, N.J. Kluit, P. Kokkinias, P. Kourkoumelis, C. Kouznetsov, O. Krumstein, Z. Kucharczyk, M. Lamsa, J. Leder, G. Ledroit, F. Leinonen, L. Leitner, R. Lemonne, J. Lepeltier, V. Lesiak, T. Liebig, W. Liko, D. Lipniacka, A. Lopes, J.H. Lopez, J.M. Loukas, D. Lutz, P. Lyons, L. MacNaughton, J. Malek, A. Maltezos, S. Mandl, F. Marco, J. Marco, R. Marechal, B. Margoni, M. Marin, J.-C. Mariotti, C. Markou, A. Martinez-Rivero, C. Masik, J. Mastroyiannopoulos, N. Matorras, F. Matteuzzi, C. Mazzucato, F. Mazzucato, M. Mc Nulty, R. Meroni, C. Migliore, E. Mitaroff, W. Mjoernmark, U. Moa, T. Moch, M. Moenig, K. Monge, R. Montenegro, J. Moraes, D. Moreno, S. Morettini, P. Mueller, U. Muenich, K. Mulders, M. Mundim, L. Murray, W. Muryn, B. Myatt, G. Myklebust, T. Nassiakou, M. Navarria, F. Nawrocki, K. Nicolaidou, R. Nikolenko, M. Oblakowska-Mucha, A. Obraztsov, V. Olshevski, A. Onofre, A. Orava, R. Osterberg, K. Ouraou, A. Oyanguren, A. Paganoni, M. Paiano, S. Palacios, J.P. Palka, H. Papadopoulou, T.D. Pape, L. Parkes, C. Parodi, F. Parzefall, U. Passeri, A. Passon, O. Peralta, L. Perepelitsa, V. Perrotta, A. Petrolini, A. Piedra, J. Pieri, L. Pierre, F. Pimenta, M. Piotto, E. Podobnik, T. Poireau, V. Pol, M.E. Polok, G. Pozdniakov, V. Pukhaeva, N. Pullia, A. Rames, J. Read, A. Rebecchi, P. Rehn, J. Reid, D. Reinhardt, R. Renton, P. Richard, F. Ridky, J. Rivero, M. Rodriguez, D. Romero, A. Ronchese, P. Roudeau, P. Rovelli, T. Ruhlmann-Kleider, V. Ryabtchikov, D. Sadovsky, A. Salmi, L. Salt, J. Sander, C. Savoy-Navarro, A. Schwickerath, U. Segar, A. Sekulin, R. Siebel, M. Sisakian, A. Smadja, G. Smirnova, O. Sokolov, A. Sopczak, A. Sosnowski, R. Spassov, T. Stanitzki, M. Stocchi, A. Strauss, J. Stugu, B. Szczekowski, M. Szeptycka, M. Szumlak, T. Tabarelli, T. Taffard, A.C. Tegenfeldt, F. Timmermans, J. Tkatchev, L. Tobin, M. Todorovova, S. Tome, B. Tonazzo, A. Tortosa, P. Travnicek, P. Treille, D. Tristram, G. Trochimczuk, M. Troncon, C. Turluer, M.-L. Tyapkin, I.A. Tyapkin, P. Tzamarias, S. Uvarov, V. Valenti, G. van Dam, P. van Eldik, J. van Lysebetten, A. van Remortel, N. van Vulpen, I. Vegni, G. Veloso, F. Venus, W. Verdier, P. Verzi, V. Vilanova, D. Vitale, L. Vrba, V. Wahlen, H. Washbrook, A.J. Weiser, C. Wicke, D. Wickens, J. Wilkinson, G. Winter, M. Witek, M. Yushchenko, O. Zalewska, A. Zalewski, P. Zavrtanik, D. Zhuravlov, V. Zimin, N.I. Zintchenko, A. Zupan, M.

Subjects
High Energy Physics::Phenomenology, High Energy Physics::Experiment
Abstract

A search for excited lepton production in e+ e- collisions was performed using the data collected by the DELPHI detector at LEP at centre-of-mass energies ranging from 189 GeV to 209 GeV, corresponding to an integrated luminosity of approximately 600 pb-1. No evidence for excited lepton production was found. In searches for pair-produced excited leptons. lower mass limits were established in the range 94-103 GeV/c 2 , depending on the channel and model assumptions. In searches for singly-produced excited leptons, upper limits on the parameter f/Δ were established as a function of the mass.

Published
2006

45. Evidence for an excess of soft photons in hadronic decays of Z0

Author

Abdallah, J. Abreu, P. Adam, W. Adzic, P. Albrecht, T. Alderweireld, T. Alemany-Fernandez, R. Allmendinger, T. Allport, P.P. Amaldi, U. Amapane, N. Amato, S. Anashkin, E. Andreazza, A. Andringa, S. Anjos, N. Antilogus, P. Apel, W.-D. Arnoud, Y. Ask, S. Asman, B. Augustin, J.E. Augustinus, A. Baillon, P. Ballestrero, A. Bambade, P. Barbier, R. Bardin, D. Barker, G.J. Baroncelli, A. Battaglia, M. Baubillier, M. Becks, K.-H. Begalli, M. Behrmann, A. Ben-Haim, E. Benekos, N. Benvenuti, A. Berat, C. Berggren, M. Berntzon, L. Bertrand, D. Besancon, M. Besson, N. Bloch, D. Blom, M. Bluj, M. Bonesini, M. Boonekamp, M. Booth, P.S.L. Borisov, G. Botner, O. Bouquet, B. Bowcock, T.J.V. Boyko, I. Bracko, M. Brenner, R. Brodet, E. Bruckman, P. Brunet, J.M. Buschbeck, B. Buschmann, P. Calvi, M. Camporesi, T. Canale, V. Carena, F. Castro, N. Cavallo, F. Chapkin, M. Charpentier, P. Checchia, P. Chierici, R. Chliapnikov, P. Chudoba, J. Chung, S.U. Cieslik, K. Collins, P. Contri, R. Cosme, G. Cossutti, F. Costa, M.J. Crennell, D. Cuevas, J. D'Hondt, J. Dalmau, J. da Silva, T. da Silva, W. della Ricca, G. de Angelis, A. de Boer, W. de Clercq, C. de Lotto, B. de Maria, N. de Min, A. de Paula, L. di Ciaccio, L. di Simone, A. Doroba, K. Drees, J. Eigen, G. Ekelof, T. Ellert, M. Elsing, M. Espirito Santo, M.C. Fanourakis, G. Fassouliotis, D. Feindt, M. Fernandez, J. Ferrer, A. Ferro, F. Flagmeyer, U. Foeth, H. Fokitis, E. Fulda-Quenzer, F. Fuster, J. Gandelman, M. Garcia, C. Gavillet, P. Gazis, E. Gokieli, R. Golob, B. Gomez-Ceballos, G. Goncalves, P. Graziani, E. Grosdidier, G. Grzelak, K. Guy, J. Haag, C. Hallgren, A. Hamacher, K. Hamilton, K. Haug, S. Hauler, F. Hedberg, V. Hennecke, M. Herr, H. Hoffman, J. Holmgren, S.-O. Holt, P.J. Houlden, M.A. Hultqvist, K. Jackson, J.N. Jarlskog, G. Jarry, P. Jeans, D. Johansson, E.K. Johansson, P.D. Jonsson, P. Joram, C. Jungermann, L. Kapusta, F. Katsanevas, S. Katsoufis, E. Kernel, G. Kersevan, B.P. Kerzel, U. King, B.T. Kjaer, N.J. Kluit, P. Kokkinias, P. Kourkoumelis, C. Kouznetsov, O. Krumstein, Z. Kucharczyk, M. Lamsa, J. Leder, G. Ledroit, F. Leinonen, L. Leitner, R. Lemonne, J. Lepeltier, V. Lesiak, T. Liebig, W. Liko, D. Lipniacka, A. Lopes, J.H. Lopez, J.M. Loukas, D. Lutz, P. Lyons, L. MacNaughton, J. Malek, A. Maltezos, S. Mandl, F. Marco, J. Marco, R. Marechal, B. Margoni, M. Marin, J.-C. Mariotti, C. Markou, A. Martinez-Rivero, C. Masik, J. Mastroyiannopoulos, N. Matorras, F. Matteuzzi, C. Mazzucato, F. Mazzucato, M. Mc Nulty, R. Meroni, C. Migliore, E. Mitaroff, W. Mjoernmark, U. Moa, T. Moch, M. Moenig, K. Monge, R. Montenegro, J. Moraes, D. Moreno, S. Morettini, P. Mueller, U. Muenich, K. Mulders, M. Mundim, L. Murray, W. Muryn, B. Myatt, G. Myklebust, T. Nassiakou, M. Navarria, F. Nawrocki, K. Nicolaidou, R. Nikolenko, M. Oblakowska-Mucha, A. Obraztsov, V. Olshevski, A. Onofre, A. Orava, R. Osterberg, K. Ouraou, A. Oyanguren, A. Paganoni, M. Paiano, S. Palacios, J.P. Palka, H. Papadopoulou, T.D. Pape, L. Parkes, C. Parodi, F. Parzefall, U. Passeri, A. Passon, O. Peralta, L. Perepelitsa, V. Perrotta, A. Petrolini, A. Piedra, J. Pieri, L. Pierre, F. Pimenta, M. Piotto, E. Podobnik, T. Poireau, V. Pol, M.E. Polok, G. Pozdniakov, V. Pukhaeva, N. Pullia, A. Rames, J. Read, A. Rebecchi, P. Rehn, J. Reid, D. Reinhardt, R. Renton, P. Richard, F. Ridky, J. Rivero, M. Rodriguez, D. Romero, A. Ronchese, P. Roudeau, P. Rovelli, T. Ruhlmann-Kleider, V. Ryabtchikov, D. Sadovsky, A. Salmi, L. Salt, J. Sander, C. Savoy-Navarro, A. Schwickerath, U. Segar, A. Sekulin, R. Siebel, M. Sisakian, A. Smadja, G. Smirnova, O. Sokolov, A. Sopczak, A. Sosnowski, R. Spassov, T. Stanitzki, M. Stocchi, A. Strauss, J. Stugu, B. Szczekowski, M. Szeptycka, M. Szumlak, T. Tabarelli, T. Taffard, A.C. Tegenfeldt, F. Timmermans, J. Tkatchev, L. Tobin, M. Todorovova, S. Tome, B. Tonazzo, A. Tortosa, P. Travnicek, P. Treille, D. Tristram, G. Trochimczuk, M. Troncon, C. Turluer, M.-L. Tyapkin, I.A. Tyapkin, P. Tzamarias, S. Uvarov, V. Valenti, G. van Dam, P. van Eldik, J. van Remortel, N. van Vulpen, I. Vegni, G. Veloso, F. Venus, W. Verdier, P. Verzi, V. Vilanova, D. Vitale, L. Vrba, V. Wahlen, H. Washbrook, A.J. Weiser, C. Wicke, D. Wickens, J. Wilkinson, G. Winter, M. Witek, M. Yushchenko, O. Zalewska, A. Zalewski, P. Zavrtanik, D. Zhuravlov, V. Zimin, N.I. Zintchenko, A. Zupan, M.

Subjects
Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Experiment, Nuclear Experiment
Abstract

Soft photons inside hadronic jets converted in front of the DELPHI main tracker (TPC) in events of qq̄ disintegrations of the Z0 were studied in the kinematic range 0.2

Published
2006

46. Study of double-tagged γγ events at LEPII

Author

Abdallah, J. Abreu, P. Adam, W. Adzic, P. Albrecht, T. Alderweireld, T. Alemany-Fernandez, R. Allmendinger, T. Allport, P.P. Amaldi, U. Amapane, N. Amato, S. Anashkin, E. Andreazza, A. Andringa, S. Anjos, N. Antilogus, P. Apel, W.-D. Arnoud, Y. Ask, S. Asman, B. Augustin, J.E. Augustinus, A. Baillon, P. Ballestrero, A. Bambade, P. Barbier, R. Bardin, D. Barker, G.J. Baroncelli, A. Battaglia, M. Baubillier, M. Becks, K.-H. Begalli, M. Behrmann, A. Ben-Haim, E. Benekos, N. Benvenuti, A. Berat, C. Berggren, M. Berntzon, L. Bertrand, D. Besancon, M. Besson, N. Bloch, D. Blom, M. Bluj, M. Bonesini, M. Boonekamp, M. Booth, P.S.L. Borisov, G. Botner, O. Bouquet, B. Bowcock, T.J.V. Boyko, I. Bracko, M. Brenner, R. Brodet, E. Bruckman, P. Brunet, J.M. Bugge, L. Buschmann, P. Calvi, M. Camporesi, T. Canale, V. Carena, F. Castro, N. Cavallo, F. Chapkin, M. Charpentier, P. Checchia, P. Chierici, R. Chliapnikov, P. Chudoba, J. Chung, S.U. Cieslik, K. Collins, P. Contri, R. Cosme, G. Cossutti, F. Costa, M.J. Crawley, B. Crennell, D. Cuevas, J. D'Hondt, J. Dalmau, J. da Silva, T. da Silva, W. della Ricca, G. de Angelis, A. de Boer, W. de Clercq, C. de Lotto, B. de Maria, N. de Min, A. de Paula, L. di Ciaccio, L. di Simone, A. Doroba, K. Drees, J. Dris, M. Eigen, G. Ekelof, T. Ellert, M. Elsing, M. Espirito Santo, M.C. Fanourakis, G. Fassouliotis, D. Feindt, M. Fernandez, J. Ferrer, A. Ferro, F. Flagmeyer, U. Foeth, H. Fokitis, E. Fulda-Quenzer, F. Fuster, J. Gandelman, M. Garcia, C. Gavillet, P. Gazis, E. Gokieli, R. Golob, B. Gomez-Ceballos, G. Goncalves, P. Graziani, E. Grosdidier, G. Grzelak, K. Guy, J. Haag, C. Hallgren, A. Hamacher, K. Hamilton, K. Haug, S. Hauler, F. Hedberg, V. Hennecke, M. Herr, H. Hoffman, J. Holmgren, S.-O. Holt, P.J. Houlden, M.A. Hultqvist, K. Jackson, J.N. Jarlskog, G. Jarry, P. Jeans, D. Johansson, E.K. Johansson, P.D. Jonsson, P. Joram, C. Jungermann, L. Kapusta, F. Katsanevas, S. Katsoufis, E. Kernel, G. Kersevan, B.P. Kerzel, U. Kiiskinen, A. King, B.T. Kjaer, N.J. Kluit, P. Kokkinias, P. Kourkoumelis, C. Kouznetsov, O. Krumstein, Z. Kucharczyk, M. Lamsa, J. Leder, G. Ledroit, F. Leinonen, L. Leitner, R. Lemonne, J. Lepeltier, V. Lesiak, T. Liebig, W. Liko, D. Lipniacka, A. Lopes, J.H. Lopez, J.M. Loukas, D. Lutz, P. Lyons, L. MacNaughton, J. Malek, A. Maltezos, S. Mandl, F. Marco, J. Marco, R. Marechal, B. Margoni, M. Marin, J.-C. Mariotti, C. Markou, A. Martinez-Rivero, C. Masik, J. Mastroyiannopoulos, N. Matorras, F. Matteuzzi, C. Mazzucato, F. Mazzucato, M. Mc Nulty, R. Meroni, C. Meyer, W.T. Migliore, E. Mitaroff, W. Mjoernmark, U. Moa, T. Moch, M. Moenig, K. Monge, R. Montenegro, J. Moraes, D. Moreno, S. Morettini, P. Mueller, U. Muenich, K. Mulders, M. Mundim, L. Murray, W. Muryn, B. Myatt, G. Myklebust, T. Nassiakou, M. Navarria, F. Nawrocki, K. Nicolaidou, R. Nikolenko, M. Oblakowska-Mucha, A. Obraztsov, V. Olshevski, A. Onofre, A. Orava, R. Osterberg, K. Ouraou, A. Oyanguren, A. Paganoni, M. Paiano, S. Palacios, J.P. Palka, H. Papadopoulou, T.D. Pape, L. Parkes, C. Parodi, F. Parzefall, U. Passeri, A. Passon, O. Peralta, L. Perepelitsa, V. Perrotta, A. Petrolini, A. Piedra, J. Pieri, L. Pierre, F. Pimenta, M. Piotto, E. Podobnik, T. Poireau, V. Pol, M.E. Polok, G. Pozdniakov, V. Pukhaeva, N. Pullia, A. Rames, J. Ramler, L. Read, A. Rebecchi, P. Rehn, J. Reid, D. Reinhardt, R. Renton, P. Richard, F. Ridky, J. Rivero, M. Rodriguez, D. Romero, A. Ronchese, P. Rosenberg, E. Roudeau, P. Rovelli, T. Ruhlmann-Kleider, V. Ryabtchikov, D. Sadovsky, A. Salmi, L. Salt, J. Savoy-Navarro, A. Schwickerath, U. Segar, A. Sekulin, R. Siebel, M. Sisakian, A. Smadja, G. Smirnova, O. Sokolov, A. Sopczak, A. Sosnowski, R. Spassov, T. Stanitzki, M. Stocchi, A. Strauss, J. Stugu, B. Szczekowski, M. Szeptycka, M. Szumlak, T. Tabarelli, T. Taffard, A.C. Tegenfeldt, F. Timmermans, J. Tkatchev, L. Tobin, M. Todorovova, S. Tome, B. Tonazzo, A. Tortosa, P. Travnicek, P. Treille, D. Tristram, G. Trochimczuk, M. Troncon, C. Turluer, M.-L. Tyapkin, P. Tzamarias, S. Uvarov, V. Valenti, G. van Dam, P. van Eldik, J. van Lysebetten, A. van Remortel, N. van Vulpen, I. Vegni, G. Veloso, F. Venus, W. Verdier, P. Vertogradova, Y.L. Verzi, V. Vilanova, D. Vitale, L. Vrba, V. Wahlen, H. Washbrook, A.J. Weiser, C. Wicke, D. Wickens, J. Wilkinson, G. Winter, M. Witek, M. Yushchenko, O. Zalewska, A. Zalewski, P. Zavrtanik, D. Zhuravlov, V. Zimin, N.I. Zintchenko, A. Zupan, M.

Abstract

Double-tagged interactions of photons with virtualities Q2 between 10 GeV2 and 200 GeV2 are studied with the data collected by DELPHI at LEPII from 1998 to 2000, corresponding to an integrated luminosity of 550 pb-1. The γ*γ* → μ+μ- data agree with QED predictions. The cross-section of the reaction γ*γ* → hadrons is measured and compared to the LO and NLO BFKL calculations.

Published
2006

47. Determination of heavy quark non-perturbative parameters from spectral moments in semileptonic B decays

Author

Abdallah, J. Abreu, P. Adam, W. Adzic, P. Albrecht, T. Alderweireld, T. Alemany-Fernandez, R. Allmendinger, T. Allport, P. Amaldi, U. Amapane, N. Amato, S. Anashkin, E. Andreazza, A. Andringa, S. Anjos, N. Antilogus, P. Apel, W.-D. Arnoud, Y. Ask, S. Asman, B. Augustin, E. Augustinus, A. Baillon, P. Ballestrero, A. Bambade, P. Barbier, R. Bardin, D. Barker, J. Baroncelli, A. Battaglia, M. Baubillier, M. Becks, K.-H. Begalli, M. Behrmann, A. Ben-Haim, E. Benekos, N. Benvenuti, A. Berat, C. Berggren, M. Berntzon, L. Bertrand, D. Besancon, M. Besson, N. Bloch, D. Blom, M. Bluj, M. Bonesini, M. Boonekamp, M. Booth, L. Borisov, G. Botner, O. Bouquet, B. Bowcock, V. Boyko, I. Bracko, M. Brenner, R. Brodet, E. Bruckman, P. Brunet, M. Buschmann, P. Calvi, M. Camporesi, T. Canale, V. Carena, F. Castro, N. Cavallo, F. Chapkin, M. Charpentier, P. Checchia, P. Chierici, R. Chliapnikov, P. Chudoba, J. Chung, U. Cieslik, K. Collins, P. Contri, R. Cosme, G. Cossutti, F. Costa, J. Crennell, D. Cuevas, J. D'Hondt, J. Dalmau, J. da Silva, T. da Silva, W. della Ricca, G. de Angelis, A. de Boer, W. de Clercq, C. de Lotto, B. de Maria, N. de Min, A. de Paula, L. di Ciaccio, L. di Simone, A. Doroba, K. Drees, J. Eigen, G. Ekelof, T. Ellert, M. Elsing, M. Espirito Santo, C. Fanourakis, G. Fassouliotis, D. Feindt, M. Fernandez, J. Ferrer, A. Ferro, F. Flagmeyer, U. Foeth, H. Fokitis, E. Fulda-Quenzer, F. Fuster, J. Gandelman, M. Garcia, C. Gavillet, P. Gazis, E. Gokieli, R. Golob, B. Gomez-Ceballos, G. Goncalves, P. Graziani, E. Grosdidier, G. Grzelak, K. Guy, J. Haag, C. Hallgren, A. Hamacher, K. Hamilton, K. Haug, S. Hauler, F. Hedberg, V. Hennecke, M. Herr, H. Hoffman, J. Holmgren, S.-O. Holt, J. Houlden, A. Hultqvist, K. Jackson, N. Jarlskog, G. Jarry, P. Jeans, D. Johansson, K. Johansson, D. Jonsson, P. Joram, C. Jungermann, L. Kapusta, F. Katsanevas, S. Katsoufis, E. Kernel, G. Kersevan, P. Kerzel, U. King, T. Kjaer, J. Kluit, P. Kokkinias, P. Kourkoumelis, C. Kouznetsov, O. Krumstein, Z. Kucharczyk, M. Lamsa, J. Leder, G. Ledroit, F. Leinonen, L. Leitner, R. Lemonne, J. Lepeltier, V. Lesiak, T. Liebig, W. Liko, D. Lipniacka, A. Lopes, H. Lopez, M. Loukas, D. Lutz, P. Lyons, L. MacNaughton, J. Malek, A. Maltezos, S. Mandl, F. Marco, J. Marco, R. Marechal, B. Margoni, M. Marin, J.-C. Mariotti, C. Markou, A. Martinez-Rivero, C. Masik, J. Mastroyiannopoulos, N. Matorras, F. Matteuzzi, C. Mazzucato, F. Mazzucato, M. Mc Nulty, R. Meroni, C. Migliore, E. Mitaroff, W. Mjoernmark, U. Moa, T. Moch, M. Moenig, K. Monge, R. Montenegro, J. Moraes, D. Moreno, S. Morettini, P. Mueller, U. Muenich, K. Mulders, M. Mundim, L. Murray, W. Muryn, B. Myatt, G. Myklebust, T. Nassiakou, M. Navarria, F. Nawrocki, K. Nicolaidou, R. Nikolenko, M. Oblakowska-Mucha, A. Obraztsov, V. Olshevski, A. Onofre, A. Orava, R. Osterberg, K. Ouraou, A. Oyanguren, A. Paganoni, M. Paiano, S. Palacios, P. Palka, H. Papadopoulou, D. Pape, L. Parkes, C. Parodi, F. Parzefall, U. Passeri, A. Passon, O. Peralta, L. Perepelitsa, V. Perrotta, A. Petrolini, A. Piedra, J. Pieri, L. Pierre, F. Pimenta, M. Piotto, E. Podobnik, T. Poireau, V. Pol, E. Polok, G. Pozdniakov, V. Pukhaeva, N. Pullia, A. Rames, J. Read, A. Rebecchi, P. Rehn, J. Reid, D. Reinhardt, R. Renton, P. Richard, F. Ridky, J. Rivero, M. Rodriguez, D. Romero, A. Ronchese, P. Roudeau, P. Rovelli, T. Ruhlmann-Kleider, V. Ryabtchikov, D. Sadovsky, A. Salmi, L. Salt, J. Sander, C. Savoy-Navarro, A. Schwickerath, U. Segar, A. Sekulin, R. Siebel, M. Sisakian, A. Smadja, G. Smirnova, O. Sokolov, A. Sopczak, A. Sosnowski, R. Spassov, T. Stanitzki, M. Stocchi, A. Strauss, J. Stugu, B. Szczekowski, M. Szeptycka, M. Szumlak, T. Tabarelli, T. Taffard, C. Tegenfeldt, F. Timmermans, J. Tkatchev, L. Tobin, M. Todorovova, S. Tome, B. Tonazzo, A. Tortosa, P. Travnicek, P. Treille, D. Tristram, G. Trochimczuk, M. Troncon, C. Turluer, M.-L. Tyapkin, A. Tyapkin, P. Tzamarias, S. Uvarov, V. Valenti, G. van Dam, P. van Eldik, J. van Remortel, N. van Vulpen, I. Vegni, G. Veloso, F. Venus, W. Verdier, P. Verzi, V. Vilanova, D. Vitale, L. Vrba, V. Wahlen, H. Washbrook, J. Weiser, C. Wicke, D. Wickens, J. Wilkinson, G. Winter, M. Witek, M. Yushchenko, O. Zalewska, A. Zalewski, P. Zavrtanik, D. Zhuravlov, V. Zimin, I. Zintchenko, A. Zupan, M.

Subjects
High Energy Physics::Phenomenology, High Energy Physics::Experiment, Nuclear Experiment
Abstract

Moments of the hadronic invariant mass and of the lepton energy spectra in semileptonic B decays have been determined with the data recorded by the DELPHI detector at LEP. From measurements of the inclusive b-hadron semileptonic decays, and imposing constraints from other measurements on b- and c-quark masses, the first three moments of the lepton energy distribution and of the hadronic mass distribution, have been used to determine parameters which enter into the extraction of |Vcb| from the measurement of the inclusive b-hadron semileptonic decay width. The values obtained in the kinetic scheme are: mb(1 GeV) = 4.591 ± 0.062 ± 0.039 ± 0.005 GeV/c2, mc(1 GeV) = 1.170 ± 0.093 ± 0.055 ± 0.005 GeV/c2, μπ2(1 GeV) = 0.399 ± 0.048 ± 0.034 ± 0.087 GeV2, ∂̃D 3 = 0.053 ± 0.017 ± 0.011 ± 0.026 GeV3, and include corrections at order 1/m b 3, Using these results, and present measurements of the inclusive semileptonic decay partial width of b-hadrons at LEP, an accurate determination of |Vcb| is obtained: |Vcb| = 0.0421 × (1 ± 0.014meas. ± 0.014flt ± 0.015th.).

Published
2006

48. Study of leading hadrons in gluon and quark fragmentation

Author

Abdallah, J. Abreu, P. Adam, W. Adzic, P. Albrecht, T. and Alemany-Fernandez, R. Allmendinger, T. Allport, P. P. and Amaldi, U. Amapane, N. Amato, S. Anashkin, E. Andreazza, A. Andringa, S. Anjos, N. Antilogus, P. Apel, W. -D. and Arnoud, Y. Ask, S. Asman, B. Augustin, J. E. Augustinus, A. Baillon, P. Ballestrero, A. Bambade, P. Barbier, R. and Bardin, D. Barker, G. J. Baroncelli, A. Battaglia, M. and Baubillier, M. Becks, K. -H. Begalli, M. Behrmann, A. and Ben-Haim, E. Benekos, N. Benvenuti, A. Berat, C. and Berggren, M. Berntzon, L. Bertrand, D. Besancon, M. and Besson, N. Bloch, D. Blom, M. Bluj, M. Bonesini, M. and Boonekamp, M. Booth, P. S. L. Borisov, G. Botner, O. and Bouquet, B. Bowcock, T. J. V. Boyko, I. Bracko, M. and Brenner, R. Brodet, E. Bruckman, P. Brunet, J. M. and Buschbeck, B. Buschmann, P. Calvi, M. Camporesi, T. and Canale, V. Carena, F. Castro, N. Cavallo, F. Chapkin, M. and Charpentier, Ph. Checchia, P. Chierici, R. Chliapnikov, P. Chudoba, J. Chung, S. U. Cieslik, K. Collins, P. and Contri, R. Cosme, G. Cossutti, F. Costa, M. J. Crennell, D. Cuevas, J. D'Hondt, J. Dalmau, J. da Silva, T. Da Silva, W. Della Ricca, G. De Angelis, A. De Boer, W. De Clercq, C. De Lotto, B. De Maria, N. De Min, A. de Paula, L. Di Ciaccio, L. Di Simone, A. Doroba, K. Drees, J. Eigen, G. Ekelof, T. Ellert, M. Elsing, M. and Espirito Santo, M. C. Fanourakis, G. Fassouliotis, D. and Feindt, M. Fernandez, J. Ferrer, A. Ferro, F. Flagmeyer, U. Foeth, H. Fokitis, E. Fulda-Quenzer, F. Fuster, J. and Gandelman, M. Garcia, C. Gavillet, Ph. Gazis, E. and Gokieli, R. Golob, B. Gomez-Ceballos, G. Goncalves, P. and Graziani, E. Grosdidier, G. Grzelak, K. Guy, J. Haag, C. and Hallgren, A. Hamacher, K. Hamilton, K. Haug, S. and Hauler, F. Hedberg, V. Hennecke, M. Herr, H. Hoffman, J. and Holmgren, S. -O. Holt, P. J. Houlden, M. A. Jackson, J. N. Jarlskog, G. Jarry, P. Jeans, D. Johansson, E. K. and Johansson, P. D. Jonsson, P. Joram, C. Jungermann, L. and Kapusta, F. Katsanevas, S. Katsoufis, E. Kernel, G. and Kersevan, B. P. Kerzel, U. King, B. T. Kjaer, N. J. and Kluit, P. Kokkinias, P. Kourkoumelis, C. Kouznetsov, O. and Krumstein, Z. Kucharczyk, M. Lamsa, J. Leder, G. and Ledroit, F. Leinonen, L. Leitner, R. Lemonne, J. and Lepeltier, V. Lesiak, T. Liebig, W. Liko, D. Lipniacka, A. Lopes, J. H. Lopez, J. M. Loukas, D. Lutz, P. and Lyons, L. MacNaughton, J. Malek, A. Maltezos, S. Mandl, F. Marco, J. Marco, R. Marechal, B. Margoni, M. and Marin, J. -C. Mariotti, C. Markou, A. Martinez-Rivero, C. and Masik, J. Mastroyiannopoulos, N. Matorras, F. Matteuzzi, C. Mazzucato, F. Mazzucato, M. Mc Nulty, R. Meroni, C. and Migliore, E. Mitaroff, W. Mjoernmark, U. Moa, T. and Moch, M. Moenig, K. Monge, R. Montenegro, J. Moraes, D. and Moreno, S. Morettini, P. Mueller, U. Muenich, K. and Mulders, M. Mundim, L. Murray, W. Muryn, B. Myatt, G. and Myklebust, T. Nassiakou, M. Navarria, F. Nawrocki, K. and Nicolaidou, R. Nikolenko, M. Oblakowska-Mucha, A. and Obraztsov, V. Olshevski, A. Onofre, A. Orava, R. and Osterberg, K. Ouraou, A. Oyanguren, A. Paganoni, M. and Paiano, S. Palacios, J. P. Palka, H. Papadopoulou, Th. D. and Pape, L. Parkes, C. Parodi, F. Parzefall, U. and Passeri, A. Passon, O. Peralta, L. Perepelitsa, V. and Perrotta, A. Petrolini, A. Piedra, J. Pieri, L. Pierre, F. Pimenta, M. Piotto, E. Podobnik, T. Poireau, V. and Pol, M. E. Polok, G. Pozdniakov, V. Pukhaeva, N. Pullia, A. Rames, J. Read, A. Rebecchi, P. Rehn, J. Reid, D. and Reinhardt, R. Renton, P. Richard, F. Ridky, J. and Rivero, M. Rodriguez, D. Romero, A. Ronchese, P. and Roudeau, P. Rovelli, T. Ruhlmann-Kleider, V. Ryabtchikov, D. and Sadovsky, A. Salmi, L. Salt, J. Sander, C. and Savoy-Navarro, A. Schwickerath, U. Sekulin, R. Siebel, M. and Sisakian, A. Smadja, G. Smirnova, O. Sokolov, A. and Sopczak, A. Sosnowski, R. Spassov, T. Stanitzki, M. and Stocchi, A. Strauss, J. Stugu, B. Szczekowski, M. and Szeptycka, M. Szumlak, T. Tabarelli, T. Taffard, A. C. and Tegenfeldt, F. Timmermans, J. Tkatchev, L. Tobin, M. and Todorovova, S. Tome, B. Tonazzo, A. Tortosa, P. and Travnicek, P. Treille, D. Tristram, G. Trochimczuk, M. and Troncon, C. Turluer, M. -L. Tyapkin, I. A. Tyapkin, P. and Tzamarias, S. Uvarov, V. Valenti, G. Van Dam, P. Van Eldik, J. van Remortel, N. Van Vulpen, I. Vegni, G. and Veloso, F. Venus, W. Verdier, P. Verzi, V. Vilanova, D. and Vitale, L. Vrba, V. Wahlen, H. Washbrook, A. J. and Weiser, C. Wicke, D. Wickens, J. Wilkinson, G. Winter, M. Witek, M. Yushchenko, O. Zalewska, A. Zalewski, P. and Zavrtanik, D. Zhuravlov, V. Zimin, N. I. Zintchenko, A. and Zupan, M. DELPHI Collaboration

Subjects
High Energy Physics::Lattice, High Energy Physics::Phenomenology, High Energy Physics::Experiment, Nuclear Experiment
Abstract

The study of quark jets in e(+)e(-) reactions at LEP has demonstrated that the hadronisation process is reproduced well by the Lund string model. However. our understanding of gluon fragmentation is less complete. In this study enriched quark and gluon jet samples of different purities are selected in three-jet events from hadronic decays of the Z collected by the DELPHI experiment in the LEP runs during 1994 and 1995. The leading systems of the two kinds of jets are defined by requiring a rapidity gap and their sum of charges is studied. An excess of leading systems with total charge zero is found for gluon jets in all cases, when compared to Monte Carlo simulations with JETSET (with and without Bose-Einstein correlations included) and ARIADNE. The corresponding leading systems of quark jets do not exhibit such an excess. The influence of the gap size and of the gluon purity on the effect is studied and a concentration of the excess of neutral leading systems at low invariant masses (less than or similar to 2 GeV/c(2)) is observed, indicating that gluon jets might have an additional hitherto undetected fragmentation mode via a two-gluon system. This could be an indication of a possible production of gluonic states as predicted by QCD. (c) 2006 Elsevier B.V. All rights reserved.

Published
2006

49. Charged particle multiplicity in three-jet events and two-gluon systems

Author

Abdallah, J. Abreu, P. Adam, W. Adzic, P. Albrecht, T. Alderweireld, T. Alemany-Fernandez, R. Allmendinger, T. Allport, P.P. Amaldi, U. Amapane, N. Amato, S. Anashkin, E. Andreazza, A. Andringa, S. Anjos, N. Antilogus, P. Apel, W.-D. Arnoud, Y. Ask, S. Asman, B. Augustin, J.E. Augustinus, A. Baillon, P. Ballestrero, A. Bambade, P. Barbier, R. Bardin, D. Barker, G.J. Baroncelli, A. Battaglia, M. Baubillier, M. Becks, K.-H. Begalli, M. Behrmann, A. Ben-Haim, E. Benekos, N. Benvenuti, A. Berat, C. Berggren, M. Berntzon, L. Bertrand, D. Besancon, M. Besson, N. Bloch, D. Blom, M. Bluj, M. Bonesini, M. Boonekamp, M. Booth, P.S.L. Borisov, G. Botner, O. Bouquet, B. Bowcock, T.J.V. Boyko, I. Bracko, M. Brenner, R. Brodet, E. Bruckman, P. Brunet, J.M. Buschmann, P. Calvi, M. Camporesi, T. Canale, V. Carena, F. Castro, N. Cavallo, F. Chapkin, M. Charpentier, P. Checchia, P. Chierici, R. Chliapnikov, P. Chudoba, J. Chung, S.U. Cieslik, K. Collins, P. Contri, R. Cosme, G. Cossutti, F. Costa, M.J. Crennell, D. Cuevas, J. D'Hondt, J. Dalmau, J. Da Silva, T. Da Silva, W. Della Ricca, G. De Angelis, A. De Boer, W. De Clercq, C. De Lotto, B. De Maria, N. De Min, A. De Paula, L. Di Ciaccio, L. Di Simone, A. Doroba, K. Drees, J. Eigen, G. Ekelof, T. Ellert, M. Elsing, M. Espirito Santo, M.C. Fanourakis, G. Fassouliotis, D. Feindt, M. Fernandez, J. Ferrer, A. Ferro, F. Flagmeyer, U. Foeth, H. Fokitis, E. Fulda-Quenzer, F. Fuster, J. Gandelman, M. Garcia, C. Gavillet, P. Gazis, E. Gokieli, R. Golob, B. Gomez-Ceballos, G. Goncalves, P. Graziani, E. Grosdidier, G. Grzelak, K. Guy, J. Haag, C. Hallgren, A. Hamacher, K. Hamilton, K. Haug, S. Hauler, F. Hedberg, V. Hennecke, M. Herr, H. Hoffman, J. Holmgren, S.-O. Holt, P.J. Houlden, M.A. Hultqvist, K. Jackson, J.N. Jarlskog, G. Jarry, P. Jeans, D. Johansson, E.K. Johansson, P.D. Jonsson, P. Joram, C. Jungermann, L. Kapusta, F. Katsanevas, S. Katsoufis, E. Kernel, G. Kersevan, B.P. Kerzel, U. King, B.T. Kjaer, N.J. Kluit, P. Kokkinias, P. Kourkoumelis, C. Kouznetsov, O. Krumstein, Z. Kucharczyk, M. Lamsa, J. Leder, G. Ledroit, F. Leinonen, L. Leitner, R. Lemonne, J. Lepeltier, V. Lesiak, T. Liebig, W. Liko, D. Lipniacka, A. Lopes, J.H. Lopez, J.M. Loukas, D. Lutz, P. Lyons, L. MacNaughton, J. Malek, A. Maltezos, S. Mandl, F. Marco, J. Marco, R. Marechal, B. Margoni, M. Marin, J.-C. Mariotti, C. Markou, A. Martinez-Rivero, C. Masik, J. Mastroyiannopoulos, N. Matorras, F. Matteuzzi, C. Mazzucato, F. Mazzucato, M. Mc Nulty, R. Meroni, C. Migliore, E. Mitaroff, W. Mjoernmark, U. Moa, T. Moch, M. Moenig, K. Monge, R. Montenegro, J. Moraes, D. Moreno, S. Morettini, P. Mueller, U. Muenich, K. Mulders, M. Mundim, L. Murray, W. Muryn, B. Myatt, G. Myklebust, T. Nassiakou, M. Navarria, F. Nawrocki, K. Nicolaidou, R. Nikolenko, M. Oblakowska-Mucha, A. Obraztsov, V. Olshevski, A. Onofre, A. Orava, R. Osterberg, K. Ouraou, A. Oyanguren, A. Paganoni, M. Paiano, S. Palacios, J.P. Palka, H. Papadopoulou, T.D. Pape, L. Parkes, C. Parodi, F. Parzefall, U. Passeri, A. Passon, O. Peralta, L. Perepelitsa, V. Perrotta, A. Petrolini, A. Piedra, J. Pieri, L. Pierre, F. Pimenta, M. Piotto, E. Podobnik, T. Poireau, V. Pol, M.E. Polok, G. Pozdniakov, V. Pukhaeva, N. Pullia, A. Rames, J. Read, A. Rebecchi, P. Rehn, J. Reid, D. Reinhardt, R. Renton, P. Richard, F. Ridky, J. Rivero, M. Rodriguez, D. Romero, A. Ronchese, P. Roudeau, P. Rovelli, T. Ruhlmann-Kleider, V. Ryabtchikov, D. Sadovsky, A. Salmi, L. Salt, J. Sander, C. Savoy-Navarro, A. Schwickerath, U. Segar, A. Sekulin, R. Siebel, M. Sisakian, A. Smadja, G. Smirnova, O. Sokolov, A. Sopczak, A. Sosnowski, R. Spassov, T. Stanitzki, M. Stocchi, A. Strauss, J. Stugu, B. Szczekowski, M. Szeptycka, M. Szumlak, T. Tabarelli, T. Taffard, A.C. Tegenfeldt, F. Timmermans, J. Tkatchev, L. Tobin, M. Todorovova, S. Tome, B. Tonazzo, A. Tortosa, P. Travnicek, P. Treille, D. Tristram, G. Trochimczuk, M. Troncon, C. Turluer, M.-L. Tyapkin, I.A. Tyapkin, P. Tzamarias, S. Uvarov, V. Valenti, G. Van Dam, P. Van Eldik, J. van Remortel, N. Van Vulpen, I. Vegni, G. Veloso, F. Venus, W. Verdier, P. Verzi, V. Vilanova, D. Vitale, L. Vrba, V. Wahlen, H. Washbrook, A.J. Weiser, C. Wicke, D. Wickens, J. Wilkinson, G. Winter, M. Witek, M. Yushchenko, O. Zalewska, A. Zalewski, P. Zavrtanik, D. Zhuravlov, V. Zimin, N.I. Zintchenko, A. Zupan, M.

Abstract

The charged particle multiplicity in hadronic three-jet events from Z decays is investigated. The topology dependence of the event multiplicity is found to be well described by a modified leading logarithmic prediction. A parameter fit of the prediction to the data yields a measurement of the colour factor ratio CA/CF with the result CA/CF = 2.261 ± 0.014stat. ± 0.036exp. ± 0.066theo. in agreement with the SU(3) expectation of QCD. The quark-related contribution to the event multiplicity is subtracted from the three-jet event multiplicity resulting in a measurement of the multiplicity of twogluon colour-singlet states over a wide energy range. The ratios r = Ngg(s)/Nqq̄(s) of the gluon and quark multiplicities and r(1) = N′gg(s)/N′qq̄(s) of their derivatives are compared with perturbative calculations. While a good agreement between calculations and data is observed for r(1), larger deviations are found for r indicating that non-perturbative effects are more important for r than for r(1). © Springer-Verlag / Società Italiana di Fisica 2005.

Published
2005

50. Measurement of the energy dependence of hadronic jet rates and the strong coupling αs from the four-jet rate with the DELPHI detector at LEP

Author

Abdallah, J. Abreu, P. Adam, W. Adzic, P. Albrecht, T. Alderweireld, T. Alemany-Fernandez, R. Allmendinger, T. Allport, P. Amaldi, U. Amapane, N. Amato, S. Anashkin, E. Andreazza, A. Andringa, S. Anjos, N. Antilogus, P. Apel, W.-D. Arnoud, Y. Ask, S. Asman, B. Augustin, E. Augustinus, A. Baillon, P. Ballestrero, A. Bambade, P. Barbier, R. Bardin, D. Barker, G. Baroncelli, A. Battaglia, M. Baubillier, M. Becks, K.-H. Begalli, M. Behrmann, A. Ben-Haim, E. Benekos, N. Benvenuti, A. Berat, C. Berggren, M. Berntzon, L. Bertrand, D. Besancon, M. Besson, N. Bloch, D. Blom, M. Bluj, M. Bonesini, M. Boonekamp, M. Booth, L. Borisov, G. Botner, O. Bouquet, B. Bowcock, V. Boyko, I. Bracko, M. Brenner, R. Brodet, E. Bruckman, P. Brunet, M. Bugge, L. Buschmann, P. Calvi, M. Camporesi, T. Canale, V. Carena, F. Castro, N. Cavallo, F. Chapkin, M. Charpentier, Ph. Checchia, P. Chierici, R. Chliapnikov, P. Chudoba, J. Chung, U. Cieslik, K. Collins, P. Contri, R. Cosme, G. Cossutti, F. Costa, J. Crennell, D. Cuevas, J. D'Hondt, J. Dalmau, J. Da Silva, T. Da Silva, W. Della Ricca, G. De Angelis, A. De Boer, W. De Clercq, C. De Lotto, B. De Maria, N. De Min, A. De Paula, L. Di Ciaccio, L. Di Simone, A. Doroba, K. Drees, J. Dris, M. Eigen, G. Ekelof, T. Ellert, M. Elsing, M. Espirito Santo, C. Fanourakis, G. Fassouliotis, D. Feindt, M. Fernandez, J. Ferrer, A. Ferro, F. Flagmeyer, U. Foeth, H. Fokitis, E. Fulda-Quenzer, F. Fuster, J. Gandelman, M. Garcia, C. Gavillet, Ph. Gazis, E. Gokieli, R. Golob, B. Gomez-Ceballos, G. Goncalves, P. Graziani, E. Grosdidier, G. Grzelak, K. Guy, J. Haag, C. Hallgren, A. Hamacher, K. Hamilton, K. Haug, S. Hauler, F. Hedberg, V. Hennecke, M. Herr, H. Hoffman, J. Holmgren, S.-O. Holt, J. Houlden, A. Hultqvist, K. Jackson, N. Jarlskog, G. Jarry, P. Jeans, D. Johansson, K. Johansson, D. Jonsson, P. Joram, C. Jungermann, L. Kapusta, F. Katsanevas, S. Katsoufis, E. Kernel, G. Kersevan, P. Kerzel, U. Kiiskinen, A. King, T. Kjaer, J. Kluit, P. Kokkinias, P. Kourkoumelis, C. Kouznetsov, O. Krumstein, Z. Kucharczyk, M. Lamsa, J. Leder, G. Ledroit, F. Leinoneii, L. Leitner, R. Lemonne, J. Lepeltier, V. Lesiak, T. Liebig, W. Liko, D. Lipniacka, A. Lopes, H. Lopez, M. Loukas, D. Lutz, P. Lyons, L. MacNaughton, J. Malek, A. Maltezos, S. Mandl, F. Marco, J. Marco, R. Marechal, B. Margoni, M. Marin, J.-C. Mariotti, C. Markou, A. Martinez-Rivero, C. Masik, J. Mastroyiannopoulos, N. Matorras, F. Matteuzzi, C. Mazzucato, F. Mazzucato, M. Mc Nulty, R. Meroni, C. Migliore, E. Mitaroff, W. Mjoernmark, U. Moa, T. Moch, M. Moenig, K. Monge, R. Montenegro, J. Moraes, D. Moreno, S. Morettini, P. Mueller, U. Muenich, K. Mulders, M. Mundim, L. Murray, W. Muryn, B. Myatt, G. Myklebust, T. Nassiakou, M. Navarria, F. Nawrocki, K. Nicolaidou, R. Nikolenko, M. Oblakowska-Mucha, A. Obraztsov, V. Olshevski, A. Onofre, A. Orava, R. Osterberg, K. Ouraou, A. Oyanguren, A. Paganoni, M. Paiano, S. Palacios, P. Palka, H. Papadopoulou, D. Pape, L. Parkes, C. Parodi, F. Parzefall, U. Passeri, A. Passon, O. Peralta, L. Perepelitsa, V. Perrotta, A. Petrolini, A. Piedra, J. Pieri, L. Pierre, F. Pimenta, M. Piotto, E. Podobnik, T. Poireau, V. Pol, E. Polok, G. Poropat, P. Pozdniakov, V. Pukhaeva, N. Pullia, A. Rames, J. Ramler, L. Read, A. Rebecchi, P. Rehn, J. Reid, D. Reinhardt, R. Renton, P. Richard, F. Ridky, J. Rivero, M. Rodriguez, D. Romero, A. Ronchese, P. Roudeau, P. Rovelli, T. Ruhlmann-Kleider, V. Ryabtchikov, D. Sadovsky, A. Salmi, L. Salt, J. Savoy-Navarro, A. Schwickerath, U. Segar, A. Sekulin, R. Siebel, M. Sisakian, A. Smadja, G. Smirnova, O. Sokolov, A. Sopczak, A. Sosnowski, R. Spassov, T. Stanitzki, M. Stocchi, A. Strauss, J. Stugu, B. Szczekowski, M. Szeptycka, M. Szumlak, T. Tabarelli, T. Taffard, C. Tegenfeldt, F. Timmermans, J. Tkatchev, L. Tobin, M. Todorovova, S. Tome, B. Tonazzo, A. Tortosa, P. Travnicek, P. Treille, D. Tristram, G. Trochimczuk, M. Troncon, C. Turluer, M.-L. Tyapkin, A. Tyapkin, P. Tzamarias, S. Uvarov, V. Valenti, G. Van Dam, P. Van Eldik, J. Van Lysebetten, A. Van Remortel, N. Van Vulpen, I. Vegni, G. Veloso, F. Venus, W. Verdier, P. Verzi, V. Vilanova, D. Vitale, L. Vrba, V. Wahlen, H. Washbrook, J. Weiser, C. Wicke, D. Wickens, J. Wilkinson, G. Winter, M. Witek, M. Yushchenko, O. Zalewska, A. Zalewski, P. Zavrtanik, D. Zhuravlov, V. Zimin, I. Zintchenko, A. Zupan, M.

Abstract

Hadronic events from the data collected with the DELPHI detector at LEP within the energy range from 89 GeV to 209 GeV are selected, their jet rates are determined and compared to predictions of four different event generators. One of them is the recently developed APACIC++ generator which performs a massive matrix element calculation matched to a parton shower followed by string fragmentation. The four-jet rate is used to measure αs in the next-to-leading-order approximation yielding αs(M Z 2) = 0.1175 ± 0.0030. The running of αs determined by using four-jet events has been tested. The logarithmic energy slope is measured to be dαs -1/d log Ecm = 1.14 ± 0.36. Since the analysis is based on four-jet final states it represents an alternative approach to previous DELPHI αs a measurements using event shape distributions. © Springer-Verlag/Società Italiana di Fisica 2004.

Published
2005

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