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1. Strange and multistrange baryon production in Pb-Pb collisions at 158 A GeV/c

Author

Leonardo Paolo Rossi, W. Beusch, K.L. Norman, Håvard Helstrup, S. Szafran, D. Huss, G. Vassiliadis, D. Di Bari, Pavel Staroba, P. Jovanovic, M. T. Muciaccia, F. Posa, J.B. Kinson, G. Tomasicchio, Federico Antinori, V.A. Kachanov, W. Geist, N. Armenise, G. Romano, S. Saladino, A.K. Holme, V. Lenti, J. C. Lassalle, E. Andersen, Alberto Andrighetto, N. Carrer, T.F. Thorsteinsen, G. Rosa, A. Kirk, Erik H.M. Heijne, M.F. Votruba, A. Jacholkowski, W. Klempt, Eugenio Nappi, C. Salvo, Gunnar Løvhøiden, G. Grella, P. Middelkamp, J. Bán, M. Sené, M. Campbell, S. Di Liberto, H. Beker, Eugenio Cantatore, Anton Jusko, B. Sopko, H. Rotscheidt, M. A. Mazzoni, B. Ghidini, J. P. Davies, R. A. Fini, A. Singovski, J. Urban, A. Michalon, B. Pastirčák, David H. Evans, V. Mack, Vito Manzari, J. Šťastný, A. Volte, J.A. Lien, Franco Meddi, K. Šafařík, Petr Zavada, F. Navach, T. Kachelhoffer, Michele Guida, R. Lietava, I. Králik, M. Luptak, G.F. Segato, M. G. Catanesi, Giovanni Darbo, L. Šándor, F. Pellegrini, R. Sené, M. Vaníčková, M. Morando, Paolo Martinengo, T. Scognetti, E. Quercigh, Jean-Charles Fontaine, E. Chesi, Bianca Osculati, T. Storås, Tiziano Virgili, M. Dameri, M.E. Michalon-Mentzer, K. Knudson, I. Mácha, Dario Barberis, P. Sennels, J. Bohm, S. Simone, A. Di Mauro, M. Venables, R. A. Loconsole, J. Ftacnik, Rocco Caliandro, A. Diaczek, K. Fanebust, K. Piska, D. Elia, C. Voltolini, O. Villalobos Baillie, R. A. Ricci, Physique Corpusculaire et Cosmologie - Collège de France (PCC), Collège de France (CdF (institution))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Collège de France (CdF)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Heyd, Yvette

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Spectrometer, Quark-gluon plasma, nucleon, WA97, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], Detector, Strangeness, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Tracking (particle physics), Omega, Baryon, Nuclear physics, Particle
Abstract

The series of experiments (WA85, WA94 and WA97) at the Omega spectrometer at CERN SPS have systematically studied the production of different strange particles. Strangeness enhancements at central rapidities have been reported by WA85 and WA94 in S-W and SS with respect to p-A collisions. For the investigation of PbPb interactions in the WA97 experiment a new detector suitable for high particle densities, the Pixel Tracking Chamber, has been developed based on silicon pixel detectors. The results on production ratios and cross sections of Λ, Λ , Ξ − , Ξ + , Ω − and Ω + detected by this experiment are presented. A significant enhancement of the Ω over Ξ ratio is observed when comparing p-Pb to PbPb data (a factor of about 3).

Published
1998

2. First results from the 1994 lead beam run of WA97

Author

J.A. Lien, K. Fanebust, M. Dameri, M.A. Mazzoni, Federico Antinori, Erik H.M. Heijne, Leonardo Paolo Rossi, Anton Jusko, Ivan Kralik, B. R. French, Franco Meddi, P. Farthouat, T. Scognetti, Håvard Helstrup, A. Di Mauro, L. Lopez, S. Saladino, G. Vassiliadis, N. Carrer, S. Sclmane, J. Stastny, Alberto Andrighetto, S. Di Liberto, T. Virgili, A.K. Holme, M.E. Michalon-Mentzer, P. Middelkamp, H. Beker, A. Kirk, A. Volte, Jozef Urban, Paolo Martinengo, A. Pallares, S. Szafran, B. Pastirčák, Giovanni Darbo, R. Lietava, R. Sené, S. Simone, A. C. Bayes, A. Singovski, R. A. Fini, N. Armenise, C. Gemme, E. Chesi, A. Diaczek, M. T. Muciaccia, B. Sopko, V. Khodyrev, F. Pellegrini, Eugenio Cantatore, G. Romano, A. Michalon, Vito Manzari, L. Sandor, K.L. Norman, O. Villalobos Baillie, R. Blaes, Petr Zavada, B. Ghidini, R. A. Ricci, T. Reitan, G. Alexeev, J. Bán, A. Jacholkowski, E. Andersen, F. Navach, J.B. Kinson, H. Vettunen, J L. Reister, M. Morando, Ph. Leruste, I. Mácha, J. Sahagun Pareja, Dario Barberis, David H. Evans, P. Jovanovic, R. Fang, P. Sennels, B. Osculati, J. C. Lassalle, W. Geist, M. G. Catanesi, M. Sené, J. P. Davies, K. Knudson, H. Rotscheidt, T.F. Thorsteinsen, V.A. Kachanov, J. N. Carney, Gunnar Løvhøiden, F. Posa, M. Luptak, G.F. Segato, M. Vaníčková, W. Beusch, T. Kachelhoffer, Pavel Staroba, E. Quercigh, A. Inyakin, M. Benayoun, M. Pairat, Michael Campbell, D. Di Bari, J. L. Narjoux, J. Bohm, G. Grella, Michele Guida, J. Kahane, V. Lenti, T. Storaas, P. Shagin, C. Voltolini, J.M. Brom, K. Piska, J. P. Dufey, D. Elia, G. Tomasicchio, M.F. Votruba, W. Klempt, G. Rosa, Eugenio Nappi, Karel Safarik, Physique Corpusculaire et Cosmologie - Collège de France (PCC), Collège de France (CdF (institution))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Heyd, Yvette, and Collège de France (CdF)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Nuclear and High Energy Physics, Silicon pixel detectors, Silicon, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Nuclear Theory, chemistry.chemical_element, 01 natural sciences, law.invention, Nuclear physics, Baryon, Telescope, Lead (geology), chemistry, law, 0103 physical sciences, Quark Gluon Plasma, Nuclear Experiment, 010306 general physics, Beam (structure)
Abstract

WA97 is designed to study strange and multi-strange baryon and anti-baryon production in 160 A GeV c PbPb collisions at the SPS with a telescope of silicon microdetectors. Four planes of silicon pixel detectors were successfully employed during the 1994 Pb run. A total of 60M central PbPb events were collected. We describe the experimental setup and report on some preliminary results from the off-line analysis.

Published
1995

3. Charged current elastic antineutrino interactions in propane

Author

M. Schaeffer, N. Armenise, S. Bonetti, M.C. Pernigoni, J.P. Engel, Salvatore Nuzzo, J.L. Guyonnet, O. Skjeggestad, Donatella Cavalli, D. Allasia, A. Marzari Chiesa, D. Gamba, V. Bisi, F. Ruggieri, M.T. Fogli Muciaccia, T. W. Jones, L. Riccati, O. Erriquez, F. W. Bullock, R.C.W. Henderson, A. Pullia, D. Huss, J.L. Riester, F. Ramzan, B. Escoubes, A. Halsteinslid, K. Myklebost, A. Romero, A. Rognebakke, M. Rollier, Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), and Heyd, Yvette

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, chemistry.chemical_compound, Cross section (physics), [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], chemistry, Propane, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Atomic physics, Charged current
Abstract

A sample of 766 antineutrino charged current elastic events has been used to extract the variation of the elastic cross section with antineutrino energy and the distribution of d N /d q 2 . The best fit value for the parameter M A obtained from these measurements is M A = 0.91 ± 0.04 GeV/ c 2 for M V = 0.84 GeV/ c 2 . A simultaneous determination of M A and M V gives M A = 0.94 ± 0.07, M V = 0.81

Published
1979

4. An attempt to observe directly beauty particles in nuclear emulsions

Author

O. Yamakawa, D.C. Imrie, R. Arnold, Y. Maeda, M. Barth, D.H. Davis, F. Ruggieri, G. Schorochoff, N. Ushida, I. Tezuka, F.F. Heymann, D.G. Davis, O. Erriquez, K. Niu, J. K. Downes, A. Montwill, A.C. Breslin, Shigeki Tasaka, R. Roosen, A. O'Connor, Salvatore Nuzzo, Motoaki Miyanishi, S. Natali, I. G. Roberts, G. Rosa, P. Musset, Y. Tsuneoka, Francesco Romano, M. Calicchio, H. Shibuya, I. Gjerpe, D. Bertrand, Jean Sacton, Alessandra Romero, A. Manfredini, P. Lavopa, L. Di Ciaccio, Gilbert Poulard, Mitsuhiro Nakamura, G. Romano, S. Di Liberto, M. Ohashi, M. J. Esten, P. T. Trent, D. Gamba, K. Niwa, J. P. Albanese, L. Riccati, N. Armenise, H. Sletten, G.J. Lush, Y. Isokane, N. Yanagisawa, D.N. Tovee, M. Hazama, D. Allasia, V. Bisi, M. J. Price, G. Baroni, B.G. Duff, L. Ramello, A. Marzari-Chiesa, G. Bertrand-Coremans, F. Sebastiani, C. Matteuzzi, F.R. Stannard, Giorgio Maggi, J. H. Wickens, S. Petrera, M. Coupland, Franco Meddi, K. Hoshino, R. Santonico, F. Piuz, Yoshihiro Sato, M. T. Muciaccia, Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), NA19, and Heyd, Yvette

Subjects
Physics, Nuclear and High Energy Physics, Large Hadron Collider, Muon, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], Physics::Instrumentation and Detectors, media_common.quotation_subject, Direct observation, Engineering physics, nuclear emulsions, Nuclear physics, beauty particles, cern sps, Cascade, Beauty, Physique des particules élémentaires, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, Particle Physics - Experiment, media_common
Abstract

An attempt at the direct observation of the cascade decay of beauty particles, produced by π- of 350 GeV/c leading to 3 muons or 4 muons in the final state, has been made in an emulsion/counter hybrid experiment at CERN. Under the assumption that the lifetime of beauty particles is of the order of 10-13s the non-observation of any candidates provides an upper limit for beauty production of ∼90 nb at the 90% confidence level., 0, SCOPUS: ar.j, info:eu-repo/semantics/published

Published
1983

5. Coherent single pion production by antineutrino charged current interactions and test of pcac

Author

M. M. Mobayyen, C. Vallée, M. Calicchio, A. Vayaki, W. Wittek, P. Petiau, R. A. Sansum, E. F. Clayton, Mikael Berggren, Amanda Cooper-Sarkar, G. T. Jones, J. Guy, V. Brisson, P. J. Fitch, S. Natali, K. Varvell, Jean Sacton, D. R. O. Morrison, N. Armenise, W. Venus, D. B. Miller, F. Hamisi, D. Bertrand, P. O. Hulth, Jon-Paul R. Wells, H. Klein, H. Wachsmuth, M. A. Parker, R. P. Middleton, M. Neveu, W. Burkot, O. Erriquez, J. P. Baton, M. Aderholz, P. Kasper, F. W. Bullock, Pierre Marage, P. P. Allport, Steve O'Neale, E. Simopoulou, T. Coghen, G. Gerbier, and Girod, Dominique

Subjects
Physics, Particle physics, Range (particle radiation), Large Hadron Collider, Physics and Astronomy (miscellaneous), Meson, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear Theory, chemistry.chemical_element, Propagator, Absolute value, Nuclear physics, Neon, Pion, chemistry, Physique des particules élémentaires, High Energy Physics::Experiment, Nuclear Experiment, Engineering (miscellaneous), Charged current, Particle Physics - Experiment
Abstract

The cross section for coherent production of a single π- meson in charged current antineutrino interactions on neon nuclei has been measured in BEBC to be (175±25) 10-40 cm2/neon nucleus, averaged over the energy spectrum of the antineutrino wide band beam at the CERN SPS; this corresponds to (0.9±0.1) % of the total charged current {Mathematical expression} cross section. The distributions of kinematical variables are in agreement with theoretical predictions based on the PCAC hypothesis and the meson dominance model; in particular, the Q2 dependence is well described by a propagator containing a mass m=(1.35±0.18) GeV. The absolute value of the cross section is also in agreement with the model. This analysis thus provides a test of the PCAC hypothesis in the antineutrino energy range 5-150 GeV. © 1986 Springer-Verlag., 0, 42 auteurs, SCOPUS: ar.j, info:eu-repo/semantics/published

Published
1986

6. Study of neutrino-induced dimuon events in gargamelle at CERN-SPS

Author

B. Pattison, S. Natali, G. Carnesecchi, M. Willutzky, S. Ragazzi, D. Blum, C. Pascaud, N. Armenise, A. Pullia, P. Alibran, J. Bourotte, J. Gillespie, P. Lundborg, Donatella Cavalli, H. Sletten, E. Bellotti, J.P. Vialle, Ph. Heusse, F. Romano, S. Bonetti, M. Haguenauer, A.M. Lutz, B. Degrange, H. Burmeister, L. Zanotti, Gilbert Poulard, O. Erriquez, F. Jacquet, J. Sleeman, C. Matteuzzi, M. Rollier, G. Conforto, C. Longuemare, G. Bonneaud, P. Musset, A. Blondel, U. Nguyen-Khac, M.T. Fogli-Muciaccia, Salvatore Nuzzo, Heyd, Yvette, Institut de Recherches Subatomiques (IReS), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Semileptonic decay, Nuclear and High Energy Physics, Particle physics, Missing energy, Meson, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], Hadron, Elementary particle, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear physics, Particle decay, Gargamelle, Neutrino, Particle Physics - Experiment
Abstract

This letter reports a study of 117 opposite-sign and 41 like-sign dimuons, in a wide-band neutrino exposure of Gargamelle at CERN SPS. No signal is found in the μ − μ − channel. The μ − μ + channel is found to be dominated by D-meson production and decay. There is evidence in these events for missing energy which may be interpreted as an unseen neutrino. The V 0 multiplicities, K 0 /event=0.53 −0.20 +0.25 and Λ /event=0.03 −0.04 +0.06 show only evidence for charmed meson production. Information on the D-meson fragmentation function is presented. In a specific model, a rate σ (μ − μ + ) σ(μ − ) =(0.72±0.14×10 −2 is found, independent of the energy. An investigation of these events for visible D-decays sets a limit on the life-time τ D −12 s at 90% C.L.

Published
1979

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