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161 results on '"R. MESSI"'

1. Upper limit on the η → π + π − branching fraction with the KLOE experiment

Author

S. Miscetti, E. P. Solodov, A. Di Cicco, E. Perez del Rio, Tord Johansson, R. Messi, D. Domenici, W. Wislicki, V. De Leo, S. Giovannella, S. Parzych, Marco Schioppa, F. Bossi, Aleksander Gajos, M. Martini, Filippo Ceradini, Magnus Wolke, P. Gauzzi, B. Cao, A. D'Uffizi, A. De Santis, V. L. Ivanov, A. Di Domenico, E. De Lucia, X. Kang, M. Berlowski, Wojciech Krzemien, E. Dané, Michał Silarski, G. Venanzoni, P. Fermani, Eryk Czerwiński, Vincenzo Patera, Andrzej Kupsc, P. Branchini, Paolo Ciambrone, A. Selce, Antonio Budano, A. Fantini, Paolo Santangelo, P.A. Lukin, D. Kisielewska-Kamińska, C. Bloise, S. Fiore, E. Graziani, D. Babusci, D. Moricciani, E.A. Kozyrev, P. De Simone, Giuseppe Mandaglio, L. Tortora, Florin Sirghi, Paweł Moskal, A. Passeri, F. Curciarello, G. D'Agostini, Babusci, D., Berlowski, M., Bloise, C., Bossi, F., Branchini, P., Budano, A., Cao, B., Ceradini, F., Ciambrone, P., Curciarello, F., Czerwinski, E., D'Agostini, G., Dane, E., De Leo, V., De Lucia, E., De Santis, A., De Simone, P., Di Cicco, A., Di Domenico, A., Domenici, D., D'Uffizi, A., Fantini, A., Fermani, P., Fiore, S., Gajos, A., Gauzzi, P., Giovannella, S., Graziani, E., Ivanov, V. L., Johansson, T., Kang, X., Kisielewska-Kaminska, D., Kozyrev, E. A., Krzemien, W., Kupsc, A., Lukin, P. A., Mandaglio, G., Martini, M., Messi, R., Miscetti, S., Moricciani, D., Moskal, P., Parzych, S., Passeri, A., Patera, V., Perez del Rio, E., Santangelo, P., Schioppa, M., Selce, A., Silarski, M., Sirghi, F., Solodov, E. P., Tortora, L., Venanzoni, G., Wislicki, W., and Wolke, M.

Subjects
Nuclear and High Energy Physics, Meson, +, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, Subatomär fysik, Experiment, 0103 physical sciences, Subatomic Physics, Radiative transfer, Invariant mass, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, Limit (mathematics), 010306 general physics, Nuclear Experiment, Settore FIS/01, Physics, Luminosity (scattering theory), 010308 nuclear & particles physics, Branching fraction, e, e(+)-e(-) Experiments, −, e +-e − Experiments, CP violation, Experiments, Rare decay, lcsh:QC770-798, High Energy Physics::Experiment
Abstract

Based on an integrated luminosity of 1.61 fb$^{-1}$ $e^+e^-$ collision data collected with the KLOE detector at DA$\Phi$NE, the Frascati $\phi$-factory, a search for the $P$- and $CP$-violating decay $\eta\to\pi^{+}\pi^{-}$ has been performed. Radiative $\phi\to\eta\gamma$ decay is exploited to access the $\eta$ mesons. No signal is observed in the $\pi^{+}\pi^{-}$ invariant mass spectrum, and the upper limit on the branching fraction at 90\% confidence level is determined to be ${\mathcal B}(\eta\to\pi^{+}\pi^{-}), Comment: 11 pages, 3 figures

Published
2020
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2. $$K^{+}\Lambda $$ photoproduction at forward angles and low momentum transfer

Author

P. Pedroni, P. Levi Sandri, A. V. Sarantsev, Patrick Bauer, M. Romaniuk, R. Messi, A. M. Lapik, Giuseppe Mandaglio, B.-E. Reitz, D. Elsner, R. Di Salvo, O. Freyermuth, A. Fantini, J. Hannappel, V. Tarakanov, Frank Frommberger, F. Ghio, N. G. Kozlenko, G. Scheluchin, V. G. Nedorezov, P. L. Cole, T. Zimmermann, D. Novinskiy, S. Goertz, D. Hammann, J. Bieling, K. Kohl, H. Schmieden, D. E. Bayadilov, A. B. Gridnev, A. Polonskiy, V. Lisin, S. Alef, V. V. Sumachev, V. A. Nikonov, A. Bella, R. Beck, T. C. Jude, V. Vegna, D. Moricciani, A. Stuglev, Francesco Messi, and A. Braghieri

Subjects
Physics, Nuclear and High Energy Physics, Spectrometer, 010308 nuclear & particles physics, Settore FIS/04, Momentum transfer, Hyperon, Lambda, 01 natural sciences, Charged particle, Momentum, Nuclear physics, Cross section (physics), Recoil, 0103 physical sciences, Nuclear Experiment, 010306 general physics
Abstract

$\gamma p \rightarrow K^+ \Lambda$ differential cross sections and recoil polarisation data from threshold for extremely forward angles are presented. The measurements were performed at the BGOOD experiment at ELSA, utilising the high angular and momentum resolution forward spectrometer for charged particle identification. The data discriminates between conflicting results in the world data set and enable extraction of the cross section as the minimum momentum transfer to the recoiling hyperon is approached., Comment: 12 pages (including a 2 page appendix), 14 figures

Published
2021
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3. K0SΣ0 photoproduction at the BGO-OD experiment

Author

T. C. Jude, A. Polonski, B.-E. Reitz, D. Elsner, V. Tarakanov, Christian Tillmanns, Giuseppe Mandaglio, Alessandro Braghieri, V. G. Nedorezov, Philip Cole, A. Fantini, Reinhard Beck, Paolo Levi Sandri, N. G. Kozlenko, A. M. Lapik, V. V. Sumachev, D. Moricciani, R. Messi, S. Alef, Rachele Di Salvo, D. Hammann, J. Hannappel, Francesco Oliver, K. Kohl, Valery Lisin, H. Schmieden, A. B. Gridnev, Patrick Bauer, O. Freyermuth, M. Romaniuk, D. V. Novinsky, G. Scheluchin, and P. Pedroni

Subjects
Physics, Spectrometer, Meson, 010308 nuclear & particles physics, QC1-999, Settore FIS/04, Momentum transfer, Nuclear Theory, Strangeness, 01 natural sciences, Nuclear physics, Dipole, 0103 physical sciences, Neutron, High Energy Physics::Experiment, 010306 general physics, Nucleon, Nuclear Experiment, Excitation
Abstract

The BGO-OD experiment at the ELSA accelerator facility uses an energy tagged bremsstrahlung photon beam to investigate the excitation structure of the nucleon via meson photoproduction. The setup with a BGO calorimeter surrounding the target and an open dipole spectrometer covering the for ward region is ideally suited for investigating low momentum transfer processes, in particular in strangeness photoproduction. The associated photoproduction of K0S and hyperons is essential to understand the role of K* exchange mech anisms. A cusp-like structure observed in the yp → K0SΣ+ reaction at the K* threshold is described by models including dynamically generated resonances from vector meson-baryon interactions. Such interactions are pre dicted to give a peak like structure in K0SΣ0 photoproduction off the neutron. A very preliminary cross section is determined and compared to the prediction, the results appear to support the model

Published
2020

4. Strangeness photoproduction at the BGO-OD experiment

Author

H. Schmieden, D. Elsner, A. B. Gridnev, N. G. Kozlenko, V. G. Nedorezov, Patrick Bauer, A. M. Lapik, T. C. Jude, G. Scheluchin, Christian Tillmanns, Valery Lisin, Alessandro Braghieri, S. Alef, Philip Cole, Paolo Levi Sandri, M. Romaniuk, B.-E. Reitz, V. Tarakanov, D. V. Novinsky, R. Messi, D. Hammann, F. Ghio, P. Pedroni, Rachele Di Salvo, D. Moricciani, O. Freyermuth, J. Hannappel, A. Polonski, K. Kohl, A. Fantini, Giuseppe Mandaglio, Reinhard Beck, and V. V. Sumachev

Subjects
Particle physics, QC1-999, Nuclear Theory, FOS: Physical sciences, Strangeness, strangeness photoproduction, 01 natural sciences, Charm quark, Momentum, Nuclear physics, 0103 physical sciences, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Physics, Spectrometer, 010308 nuclear & particles physics, BGO-OD, Settore FIS/04, Momentum transfer, Pentaquark, Λ(1405), High Energy Physics::Experiment, Nucleon, Excitation
Abstract

The BGO-OD experiment at the ELSA accelerator facility uses an energy tagged bremsstrahlung photon beam to investigate the excitation structure of the nucleon. The setup consists of a highly segmented BGO calorimeter surrounding the target, with a particle tracking magnetic spectrometer at forward angles. BGO-OD is ideal for investigating low momentum transfer processes due to the acceptance and high momentum resolution at forward angles. In particular, this enables the investigation of strangeness photoproduction where t-channel exchange mechanisms play an important role. This also allows access to low momentum exchange kinematics where extended, molecular structure may manifest in reaction mechanisms. First key results at low $t$ indicate a cusp-like structure in $K^+\Sigma^0$ photoproduction at $W = 1900$\,MeV, line shapes and differential cross sections for $K^+\Lambda$(1405)$\rightarrow K^+\Sigma^0\pi^0$, and a peak structure in $K^0_S\Sigma^0$ photoproduction. The peak in the $K^0_S\Sigma^0$ channel appears consistent with meson-baryon generated states, where equivalent models have been used to describe the $P_C$ pentaquark candidates in the heavy charmed quark sector., Comment: Proceedings of The 12th International Workshop on the Physics of Excited Nucleons (NSTAR 2019)

Published
2020

5. η’ beam asymmetry at threshold using the BGO-OD experiment

Author

Philip Cole, D. V. Novinsky, D. Hammann, A. M. Lapik, T. C. Jude, G. Scheluchin, Reinhard Beck, D. Moricciani, V. V. Sumachev, K. Kohl, Paolo Levi Sandri, V. G. Nedorezov, Patrick Bauer, R. Messi, M. Romaniuk, A. Fantini, Christian Tillmanns, Alessandro Braghieri, Valery Lisin, Rachele Di Salvo, A. Polonski, Giuseppe Mandaglio, J. Hannappel, O. Freyermuth, N. G. Kozlenko, P. Pedroni, H. Schmieden, A. B. Gridnev, V. Tarakanov, S. Alef, B.-E. Reitz, F. Ghio, and D. Elsner

Subjects
Physics, Proton, Meson, Spectrometer, 010308 nuclear & particles physics, Settore FIS/04, media_common.quotation_subject, QC1-999, 01 natural sciences, Signal, Resonance (particle physics), Asymmetry, Charged particle, Nuclear physics, 0103 physical sciences, 010306 general physics, Nuclear Experiment, Beam (structure), media_common
Abstract

The unexpected nodal structure of the beam asymmetry recently reported by the GRAAL collaboration in η′ photoproduction very close to threshold could be explained by a previously unobserved narrow resonance. The BGO-OD experiment is ideally suited to verify this measurement via the detection of forward going charged particles which in the threshold region of interest allows the identification of the reaction γp → η′ p solely based on the proton going in the forward direction. This yields unprecedented statistics if, in the missing mass analysis of the η′ meson, the background can be sufficiently well controlled. Preliminary results using a linearly polarised photon beam are shown. The reaction γp → η′ p was identified in the BGO forward spectrometer, with simulated data used to seperate signal and background.

Published
2020

6. Bell-type Polarization Experiment With Pairs Of Uncorrelated Optical Photons

Author

R. Messi, D. Moricciani, M. Iannuzzi, and R. Francini

Subjects
Physics, Quantum Physics, Photon, General Physics and Astronomy, FOS: Physical sciences, Polarization (waves), Laser, 01 natural sciences, Uncorrelated, Coincidence, 010305 fluids & plasmas, law.invention, law, Quantum mechanics, 0103 physical sciences, 010306 general physics, Quantum Physics (quant-ph)
Abstract

We present a Bell-type polarization experiment using two independent sources of polarized optical photons, and detecting the temporal coincidence of pairs of uncorrelated photons which have never been entangled in the apparatus. Very simply, our measurements have tested the quantum-mechanical equivalent of the classical Malus' law on an incoherent beam of polarized photons obtained from two separate and independent laser sources greatly reduced in intensities.The outcome of the experiment gives evidence of violation of the Bell-like inequalities. Drawing the conclusions of the present work, we invoke the distinction between the concepts of state-preparation and measurement to understand this result., Comment: 10 pages, 4 figures

Published
2020
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7. Measurement of the branching fraction for the decay KS → πμν with the KLOE detector

Author

R. Messi, Filippo Ceradini, A. Selce, Florin Sirghi, E. P. Solodov, T. Johansson, Vincenzo Patera, P.A. Lukin, Andrzej Kupsc, G. Venanzoni, P. Fermani, Paolo Ciambrone, Paweł Moskal, E. Dané, S. Parzych, S. Giovannella, Aleksander Gajos, D. Kisielewska-Kamińska, P. De Simone, D. Moricciani, Antonio Budano, E.A. Kozyrev, V. De Leo, Michał Silarski, Wojciech Krzemien, M. Berlowski, Magnus Wolke, P. Gauzzi, A. Di Domenico, P. Branchini, Paolo Santangelo, E. De Lucia, Wojciech Wiślicki, A. Passeri, M. Martini, D. Domenici, D. Babusci, A. De Santis, L. Tortora, Giuseppe Mandaglio, B. Cao, X. Kang, F. Curciarello, V. L. Ivanov, G. D'Agostini, A. Fantini, C. Bloise, E. Perez del Rio, S. Miscetti, F. Bossi, A. Di Cicco, Marco Schioppa, S. Fiore, E. Graziani, A. D'Uffizi, Eryk Czerwiński, Babusci, D., Berlowski, M., Bloise, C., Bossi, F., Branchini, P., Budano, A., Cao, B., Ceradini, F., Ciambrone, P., Curciarello, F., Czerwinski, E., D'Agostini, G., Dane, E., De Leo, V., De Lucia, E., De Santis, A., De Simone, P., Di Cicco, A., Di Domenico, A., Domenici, D., D'Uffizi, A., Fantini, A., Fermani, P., Fiore, S., Gajos, A., Gauzzi, P., Giovannella, S., Graziani, E., Ivanov, V. L., Johansson, T., Kang, X., Kisielewska-Kaminska, D., Kozyrev, E. A., Krzemien, W., Kupsc, A., Lukin, P. A., Mandaglio, G., Martini, M., Messi, R., Miscetti, S., Moricciani, D., Moskal, P., Parzych, S., Passeri, A., Patera, V., Perez del Rio, E., Santangelo, P., Schioppa, M., Selce, A., Silarski, M., Sirghi, F., Solodov, E. P., Tortora, L., Venanzoni, G., Wislicki, W., and Wolke, M.

Subjects
Semileptonic decay, +, e, −, collisions, K, 0, meson, Nuclear and High Energy Physics, Meson, 01 natural sciences, Nuclear physics, 0103 physical sciences, e+e-,collisions, e+e, 010306 general physics, Physics, Settore FIS/01, Muon, Mass distribution, 010308 nuclear & particles physics, Branching fraction, Detector, lcsh:QC1-999, K0, mesons, Data control, High Energy Physics::Experiment, e+e− collisions, K0 meson, semileptonic decay, lcsh:Physics, collision
Abstract

Based on a sample of 300 million KS mesons produced in ϕ→KLKS decays recorded by the KLOE experiment at the DAΦNE e+e− collider we have measured the branching fraction for the decay KS→πμν. The KS mesons are identified by the interaction of KL mesons in the detector. The KS→πμν decays are selected by a boosted decision tree built with kinematic variables and by a time-of-flight measurement. Signal efficiencies are evaluated with data control samples of KL→πμν decays. A fit to the reconstructed muon mass distribution finds 7223±180 signal events. Normalising to the KS→π+π− decay events the result for the branching fraction is B(KS→πμν)=(4.56±0.11stat±0.17syst)×10−4. It is the first measurement of this decay mode and the result allows an independent determination of |Vus| and a test of the lepton-flavour universality.

Published
2020

8. Erratum to: Measurement of $$\psi (2S)$$ meson production in pp collisions at $$\sqrt{s}=7\,\hbox {TeV}$$

Author

Markus Frank, R. M. D. Mamunur, K. Wyllie, Alexander Semennikov, B. Pietrzyk, Ph. Charpentier, R. F. Koopman, C. Haen, C. Hadjivasiliou, Silvia Borghi, M. Karacson, S. Ogilvy, B. Gui, C. Potterat, Oleg Yushchenko, M. Merk, J. von Loeben, L. Garrido, B. Maynard, N. Mangiafave, M. Matveev, Zishuo Yang, M. Palutan, M. O. Bettler, A. Petrolini, V. V. Gligorov, Gianni Penso, F. Domingo Bonal, L. Arrabito, C. Adrover, F. Fontanelli, L. Wiggers, F. F. Wilson, A. Gomes, L. A. Granado Cardoso, P. Hunt, Bo Liu, L. Martin, P. Spradlin, M. Nicol, W. C. Zhang, A. Powell, B. Rakotomiaramanana, N. H. Brook, B. Schmidt, J. Prisciandaro, A. Jaeger, K. Holubyev, F. Teubert, P. Collins, C. J. Parkinson, F. F. Jing, P. Morawski, F. Dupertuis, S. Vecchi, William Barter, S. Kandybei, C. Salzmann, W. Bonivento, L. Zhong, Peter Clarke, W. Baldini, W. Witzeling, Angelo Carbone, Jaap Velthuis, C. Langenbruch, G. Valenti, R. Santacesaria, T. M. Karbach, D. Brett, P. Jaton, Ivan Belyaev, Jonas Rademacker, G. Alkhazov, Yasmine Amhis, Stephen M. Stahl, Marianna Fontana, P. Alvarez Cartelle, Sandra Amato, A. Bondar, K. Belous, P. R. Li, A. Dziurda, R. Graciani Diaz, O. De Aguiar Francisco, T. J. V. Bowcock, A. Artamonov, M. Sapunov, B. Storaci, Z. Xing, P. Owen, Julien Cogan, Neville Harnew, S. Malde, P. M. Bjørnstad, R. Schwemmer, J. Imong, U. Uwer, C. Blanks, J. Dickens, Patrick Robbe, M. Calvo Gomez, Guoming Liu, N. Neufeld, H. Brown, L. Li Gioi, K. Kreplin, Victor Egorychev, V. Gibson, P. De Simone, Stephane T'Jampens, B. Spaan, P. Diniz Batista, J. M. Otalora Goicochea, D. Martinez Santos, Timothy Gershon, E. Teodorescu, J. Closier, A. Massafferri, M. Liles, A. Bobrov, G. Corti, Thomas Blake, M. Benayoun, M. Coombes, D. Voong, E. Ben-Haim, S. Furcas, S. Stoica, S. Gregson, Yongsun Kim, Nicola Serra, T. Ruf, J. Rouvinet, D. Moran, R. Plackett, J. P. Lees, T. Hartmann, D. Elsby, R. McNulty, P. Krokovny, G. Manca, O. Schneider, B. Popovici, C. Linn, M. van Beuzekom, T. Huse, G. Lanfranchi, M.-N. Minard, Ignacio Bediaga, A. D. Nguyen, A. Vorobyev, F. Dordei, E. S. Smith, C. Santamarina Rios, U. Marconi, G. Martellotti, B. Jean-Marie, A. Ukleja, Antonio Pellegrino, A. Cook, S. Belogurov, G. McGregor, S. Tourneur, D. Esperante Pereira, J. Benton, V. Fernandez Albor, Marco Adinolfi, S. Oggero, J. A. Hernando Morata, Roel Aaij, P. Sail, Howard Gordon, F. Eisele, J. Wishahi, M. Szczekowski, Tjeerd Ketel, D. Volyanskyy, Ch. Cauet, D. R. Johnson, S. Playfer, C. R. Jones, Denis Derkach, S. K. Paterson, M. Britsch, R. Le Gac, Karol Hennessy, A. Shires, S. Monteil, X. Cid Vidal, E. Lopez Asamar, F. Muheim, M. Charles, M. Witek, M. Zangoli, F. De Lorenzi, A. Pérez-Calero Yzquierdo, G. Mancinelli, Conor Fitzpatrick, C. Lazzeroni, V. Iakovenko, F. Ferreira Rodrigues, E. Polycarpo, Tatsuya Nakada, G. Bencivenni, M. Meissner, Mario Sannino, G. Krocker, A. Solomin, J. H. Lopes, G. Fardell, M. Needham, W. D. Hulsbergen, S. Blusk, Li Li, Manuel Schiller, A. Kozlinskiy, A. Dovbnya, Nikolay Nikitin, D. Savrina, V. Shevchenko, A. Büchler-Germann, F. Andrianala, R. Currie, D. Websdale, B. Couturier, S. Hansmann-Menzemer, M. Frosini, K. Kruzelecki, M. Tobin, Alessandro Camboni, W. Qian, Tara Shears, A. Sparkes, H. V. Cliff, G. J. Rogers, Chung Nguyen-Mau, K. Carvalho Akiba, M. Veltri, G. Haefeli, Alexander Inyakin, Y. M. Zhang, Federico Alessio, A. Zvyagin, A. Martín Sánchez, A. C. dos Reis, Valery Pugatch, F. Soomro, B. Muster, P. Naik, P. Ilten, A. Schopper, M. Schmelling, I. R. Kenyon, R. Mountain, M. Pappagallo, L. Carson, Anton Poluektov, N. Torr, P. David, Ch. Elsasser, Alexander Leflat, Johannes Albrecht, V. N. La Thi, A. Tsaregorodtsev, N. Chiapolini, R. Muresan, Malcolm John, I. Sepp, M. T. Tran, V. Heijne, J. Garra Tico, P. Szczypka, M. Musy, N. Tuning, M. Gandelman, Christopher Parkes, A. Bates, G. D. Lafferty, L. Shekhtman, A. Dosil Suárez, R. Gauld, Lars Eklund, V. Balagura, Ziad Ajaltouni, Frederic Machefert, Sheldon Stone, M. M. Reid, S. Benson, G. N. Patrick, D. S. Bailey, M. Ubeda Garcia, M. De Cian, J. Keaveney, R. Santinelli, T. Lesiak, F. Jansen, A. Papanestis, V. Fave, Vladimir Romanovskiy, Elie Aslanides, C. Bozzi, K. Senderowska, O. Steinkamp, M. Schlupp, E. Thomas, A. Grecu, Th. Bauer, A. Novoselov, G. D. Patel, A. Mac Raighne, Paolo Ciambrone, J. Blouw, F. Constantin, Alessio Sarti, C. Färber, E. Gushchin, Bernardo Adeva, A. Zhokhov, P. Seyfert, L. Kravchuk, D. Vieira, R. Nandakumar, Alessandro Cardini, Miroslav Saur, Roger Forty, R. J. Barlow, Xiao-Rui Lyu, M. Knecht, S. Filippov, A. Keune, A. Zhelezov, G. Carboni, Andrea Bizzeti, S. Miglioranzi, I. Videau, J. M. De Miranda, D. van Eijk, D. E. Hutchcroft, Yu. Guz, Jacques Lefrançois, A. Martens, Xavier Vilasis-Cardona, Marta Calvi, N. Sagidova, D. Dossett, Albert Bursche, Claudio Gotti, S. Roiser, G. Sabatino, E. Fanchini, M. Ferro-Luzzi, T. Nikodem, F. Stagni, R. S. Huston, E. Maurice, Dmitry Golubkov, R. Messi, S. Perazzini, C. Deplano, K. De Bruyn, J. Harrison, V. Vagnoni, M. Kucharczyk, D. A. Milanes, T. Gys, Jan Buytaert, F. Kruse, O. Callot, M. Deckenhoff, O. Maev, E. van Herwijnen, M. Plo Casasus, A. Petrella, Tomasz Skwarnicki, Victor Coco, Sebastian Bachmann, J. Bressieux, B. Pie Valls, H. Lu, V. Obraztsov, R. Ekelhof, Stephan Eisenhardt, Ross D. Young, Marc S. Williams, J. J. Saborido Silva, I. Raniuk, Pierluigi Campana, P. Rodriguez Perez, Carmelo D'Ambrosio, Jean François Marchand, N. Gauvin, A. Satta, Oleg Stenyakin, D. Hynds, D. Galli, T. Pilař, Marina Artuso, M. Patel, N. K. Watson, G. Polok, S. A. Wotton, F. Zhang, Paolo Gandini, D. L. Perego, F. Maciuc, J. Merkel, C. Satriano, I. Mous, Rudolf Oldeman, A. Gallas Torreira, G. Auriemma, V. Bocci, A. Bien, L. Del Buono, A. A. Alves, Marie Helene Schune, Olivier Leroy, J-C. Garnier, J. Palacios, D. A. Roa Romero, D. R. Ward, A. A. Affolder, S. Swientek, A. Phan, E. Rodrigues, D. Pinci, J. Anderson, E. Santovetti, M. Grabalosa Gándara, Thomas Latham, C. Patrignani, V. Tisserand, L. De Paula, Hans Dijkstra, C. Gaspar, Jing Wang, A. Mazurov, C. Göbel, S. Farry, A. Comerma-Montells, Michal Kreps, Gianluigi Casse, B. Jost, T. Brambach, C. Coca, Krzysztof Grzegorz Sobczak, R. Dzhelyadin, A. Lai, D. Wiedner, A. D. Webber, S. Donleavy, Marco Clemencic, U. Egede, E. Jans, M. S. Rangel, R. Vazquez Gomez, Nikolay Bondar, K. Ciba, P. Perret, Sergey Barsuk, H. Ruiz, G. Wilkinson, Ph. Ghez, A. Sciubba, M. Chrzaszcz, U. Straumann, Francesco Dettori, A. Falabella, Olivier Deschamps, Flavio Archilli, Biagio Saitta, J. Marks, N. Lopez-March, J. Visniakov, M. Straticiuc, G. A. Cowan, V. K. Subbiah, J. Serrano, Paul Fraser Harrison, J. van Tilburg, A. Puig Navarro, R. W. Lambert, Roberta Cardinale, M. Shapkin, Y. Shcheglov, T. Kvaratskheliya, A. Palano, Tomasz Szumlak, G. Ciezarek, R. Jacobsson, S. Schleich, F. J. P. Soler, H. Degaudenzi, S. C. Haines, D. Lacarrere, M. Lieng, E. Greening, C. Matteuzzi, Patrick Koppenburg, M. Perrin-Terrin, Lei Zhang, Roland Bernet, E. Picatoste Olloqui, S. Wandernoth, Sandro Cadeddu, J. Molina Rodriguez, S. Eidelman, A. Nomerotski, M. Nedos, A. Vollhardt, P. Urquijo, Michael Alexander, P. Henrard, F. Blanc, I. Polyakov, R. Lefèvre, T. Britton, G. Graziani, M. Pepe Altarelli, C. Barschel, P. N. Y. David, David Gascon, C. Abellan Beteta, Mikhail Zavertyaev, Marco Gersabeck, P. Vazquez Regueiro, B. Khanji, E. Tournefier, R. Silva Coutinho, Dmitry Popov, K. Müller, R. Märki, Kurt Rinnert, Marco Cattaneo, M. P. Williams, Agnieszka Oblakowska-Mucha, J. Mylroie-Smith, John Back, G. Passaleva, J. Luisier, P. Schaack, J. Garofoli, E. Hicks, T. Hampson, V. Niess, S. Ricciardi, S. Redford, E. Grauges, R. Lindner, B. K. Pal, I. Nasteva, E. Lanciotti, Y. N. Gao, R. B. Appleby, Christoph Frei, M. Jahjah Hussein, Benoit Viaud, Yuehong Xie, A. Richards, Barbara Sciascia, Mark Whitehead, C. Farinelli, J. He, S. Easo, A. Bay, A. Borgia, J. van Leerdam, G. Raven, D. Decamp, A. Golutvin, R. Harji, B. Souza De Paula, U. Kerzel, Z. Mathe, D. Lambert, J. F. J. van den Brand, Simone Bifani, and J. Panman

Subjects
Physics, Particle physics, Meson production, Physics and Astronomy (miscellaneous), 010308 nuclear & particles physics, 0103 physical sciences, 010306 general physics, 01 natural sciences, Engineering (miscellaneous)
Abstract

This erratum corrects measurements of the prompt and secondary (from-b).

Published
2020
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9. Observation of a cusp-like structure in the γp → K+Σ0 cross section at forward angles and low momentum transfer

Author

D. Elsner, P. Pedroni, N. G. Kozlenko, Giuseppe Mandaglio, R. Messi, V. G. Nedorezov, Patrick Bauer, V. A. Nikonov, P. Levi Sandri, R. Di Salvo, S. Alef, B.-E. Reitz, A. V. Sarantsev, J. Bieling, J. Hannappel, M. Romaniuk, R. Beck, F. Ghio, A. M. Lapik, V. V. Sumachev, V. Lisin, D. Hammann, Francesco Messi, H. Schmieden, D. E. Bayadilov, A. B. Gridnev, Frank Frommberger, A. Bella, A. Polonskiy, V. Tarakanov, O. Freyermuth, A. Fantini, D. Novinskiy, S. Goertz, A. Stuglev, P. L. Cole, K. Kohl, A. Braghieri, T. C. Jude, T. Zimmermann, G. Scheluchin, D. Moricciani, and V. Vegna

Subjects
Cusp (singularity), Physics, Nuclear and High Energy Physics, Reaction mechanism, Strangeness photoproduction, 010308 nuclear & particles physics, QC1-999, Settore FIS/04, Drop (liquid), Momentum transfer, BGOOD, Structure (category theory), Strangeness, 01 natural sciences, Cross section (physics), 0103 physical sciences, Polar coordinate system, Atomic physics, Nuclear Experiment, 010306 general physics
Abstract

The γ p → K + Σ 0 differential cross section at extremely forward angles was measured at the BGOOD experiment. A three-quarter drop in strength over a narrow range in energy and a strong dependence on the polar angle of the K + in the centre-of-mass of the reaction is observed at a centre-of-mass energy of 1900 MeV. Residing close to multiple open and hidden strangeness thresholds, the structure appears consistent with meson-baryon threshold effects which may contribute to the reaction mechanism.

Published
2021
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10. LIDAL (Light Ion Detector for ALTEA): A compact Time-Of-Flight detector for radiation risk assessment in space

Author

C. Berucci, G. Masciantonio, C. De Donato, F. R. Lamastra, P. Picozza, F. Tommasino, Livio Narici, M. Rovituso, L. Di Fino, R. Messi, C. La Tessa, Alessandro Rizzo, and C. Morone

Subjects
Physics, History, Range (particle radiation), Time of flight detector, Spacecraft, business.industry, Settore FIS/04, Detector, Settore FIS/07, Cosmic ray, Radiation, Space exploration, Computer Science Applications, Education, Nuclear physics, Neutron, business
Abstract

Manned space missions towards Moon and Mars planned in the next decades require a reliable radiation risk assessment considering the long time exposure of astronauts (up to years) to different radiation fields. The radiation environment inside a human space habitat, generated by the interaction of the Galactic Cosmic Rays and occasionally of Solar Particle Events with the spacecraft hull, is peculiar due to its composition (ions from Hydrogen to Iron, knock out neutrons) and the large kinetic energy range of the particles. For this reason the risk assessment approach used for astronauts in space is quite different from the one used on Earth. In this approach the risk for astronauts is evaluated calculating factors which score the risk in function of physical characteristics of the single particle, like the quality factor Q (related to the radiation ionizing power) or the squared ratio between the charge (Z) and velocity (β) of the particle (Z 2/β 2). LIDAL-ALTEA (Light Ion Detector for ALTEA - Anomalous Long Term Effects on Astronauts) is an experimental apparatus which will allow to evaluate for the first time in the field the Z 2/β 2 risk factor of the single detected particle on-board the International Space Station. The LIDAL system is a Time-Of-Flight detector designed to work paired to three Silicon Detector Units of the ALTEA, which will measure the deposited energy of the passing particle. The velocity of the particle (β), calculated from the Time-Of-Flight measurement performed by LIDAL, allows to evaluate the particle electric charge once related to the deposited energy measured by ALTEA. A first LIDAL prototype has been developed by the University of Rome “Tor Vergata” and tested at TIFPA (Trento Insistute for Fundamental Physics Applications) proton beam line, in order to evaluate the timing performances of the detector. Results are briefly presented and the current status of the apparatus production is discussed in view of the launch scheduled for 2019.

Published
2019

11. CALPRO, an unconventional calorimetry approach

Author

B. Cimmino, S. Mastroianni, M. Iacovacci, D. Moricciani, R. Messi, Iacovacci, M., Mastroianni, S., Cimmino, B., Messi, R., and Moricciani, D.

Subjects
Physics, Nuclear and High Energy Physics, Range (particle radiation), Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Resolution (electron density), Detector, Calorimetry, 01 natural sciences, Charged particle, Computational physics, Sampling (signal processing), 0103 physical sciences, High Energy Physics::Experiment, 010303 astronomy & astrophysics, Instrumentation, Single layer, Energy (signal processing)
Abstract

We propose a calorimetry approach unconventional and innovative. The method is based on the measurement of the lateral distribution of charged particles around the shower axis, it has been used for the first time in the energy determination of Extensive Air Showers at very high energy ( > 100 TeV) with single layer detector, providing an energy determination with resolution of about 10% for energies above 100 TeV. It has some peculiar characteristics which can be summarized in the following three points: (1) measurement of the shower energy by means of a single sampling; (2) calorimetry which renounces the classic concept of containment of the shower; (3) possibility to separate primary masses. In order to extend this technique at lower energies, specific simulations have been performed through GEANT4 in the energy range 100 GeV–10 TeV for different particles.

Published
2019

12. A compact Time-Of-Flight detector for radiation measurements in a space habitat: LIDAL–ALTEA

Author

Enzo Reali, C. Berucci, G. Nobili, C. De Donato, Alessandro Rizzo, R. Messi, C. La Tessa, D. Pecchi, M. C. Morone, M. Iannilli, G. Masciantonio, Livio Narici, C. Manea, M. Rovituso, G. Vitali, Francesco Tommasino, P. Picozza, P. Cipollone, and L. Di Fino

Subjects
010302 applied physics, Physics, Nuclear and High Energy Physics, Time of flight detector, Physics::Instrumentation and Detectors, business.industry, Monte Carlo method, Detector, Measure (physics), Scintillator, 01 natural sciences, Settore FIS/07 - Fisica Applicata(Beni Culturali, Ambientali, Biol.e Medicin), 030218 nuclear medicine & medical imaging, Settore FIS/04 - Fisica Nucleare e Subnucleare, TOF detectorsSilicon detectorsFLUKASpace, 03 medical and health sciences, Radiation flux, Time of flight, 0302 clinical medicine, Optics, 0103 physical sciences, International Space Station, business, Instrumentation
Abstract

LIDAL–ALTEA is a detector designed to study the radiation flux and energy spectra in the International Space Station (ISS). Its mission is manifested by NASA in 2019. The ALTEA subsystem, which took data on the ISS in the past Zaconte et al. (2010), is based on Silicon Strip detectors and will measure the released energy of the traversing particles, while the LIDAL subdetector is based on fast plastic scintillators , read by PMTs, will measure the particle Time Of Flight. A custom Front End electronics has been designed to reach a time resolution better than 120 ps. LIDAL is under construction while a prototype has been already tested with a proton beam . The measured time resolution fulfills the design expectation and is compatible with FLUKA simulations. The Monte Carlo results have also been validated by the comparison with a test measure where the ALTEA detector was exposed to proton beams.

Published
2019

13. Strangeness Photoproduction at the BGO-OD Experiment

Author

D. Moricciani, K. Kohl, V. G. Nedorezov, D. Novinskiy, P. Levi Sandri, N. G. Kozlenko, A. Polonski, Giuseppe Mandaglio, A. Fantini, P. Cole, R. Messi, V. Lisin, R. Di Salvo, G. Scheluchin, V. Tarakanov, Christian Tillmanns, A. M. Lapik, D. Elsner, O. Freyermuth, D. Hammann, J. Hannappel, Reinhard Beck, V. V. Sumachev, S. Alef, H. Schmieden, A. B. Gridnev, B.-E. Reitz, F. Ghio, T. C. Jude, Patrick Bauer, M. Romaniuk, and P. Pedroni

Subjects
Physics, Settore FIS/01, Nuclear and High Energy Physics, Calorimeter (particle physics), Spectrometer, Nuclear Theory, Momentum transfer, Bremsstrahlung, Elementary particle, Strangeness, Tracking (particle physics), Nuclear physics, Nuclear Experiment, Nucleon
Abstract

The BGO-OD experiment at the ELSA accelerator facility uses an energy tagged bremstrahlung photon beam to investigate the excitation structure of the nucleon. The setup consists of a highly segmented BGO calorimeter surrounding the target, with a particle tracking magnetic spectrometer at forward angles. BGO-OD is ideal for investigating low momentum transfer processes due to the acceptance and high momentum resolution at forward angles. In particular, this enables the investigation of strangeness photoproduction where t-channel exchange mechanisms play an important role. This also allows access to a kinematic region where extended, molecular structure may manifest in reaction mechanisms. The extensive strangeness photoproduction programme includes the photoproduction of neutral and charged kaons using both hydrogen and deuterium targets.

Published
2019

14. K+Λ(1405) photoproduction at the BGO-OD experiment

Author

Valery Lisin, Reinhard Beck, D. Elsner, A. Fantini, D. V. Novinsky, Giuseppe Mandaglio, K. Kohl, V. G. Nedorezov, V. V. Sumachev, G. Scheluchin, Paolo Levi Sandri, T. C. Jude, Mariia Romaniuk, B.-E. Reitz, V. Tarakanov, Christian Tillmanns, A. Polonski, O. Freyermuth, Patrick Bauer, Alessandro Braghieri, P. Pedroni, Philip Cole, A. M. Lapik, J. Hannappel, N. G. Kozlenko, Dario Moricciani, F. Ghio, D. Hammann, R. Messi, H. Schmieden, Rachele Di Salvo, A. B. Gridnev, and S. Alef

Subjects
Physics, Spectrometer, 010308 nuclear & particles physics, Settore FIS/04, QC1-999, High Energy Physics::Phenomenology, Constituent quark, Large aperture, 01 natural sciences, Measure (mathematics), Calorimeter, Crystal, Nuclear physics, 0103 physical sciences, High Energy Physics::Experiment, Charm (quantum number), Nuclear Experiment, 010306 general physics
Abstract

Since the discovery of the Λ(1405), it remains poorly described by conventional constituent quark models, and it is a candidate for having an “exotic” meson-baryon or “penta-quark” structure, similar to states recently reported in the hidden charm sector.The Λ(1405) can be produced in the reactionγpK+Λ(1405). The pure I=0 decay mode into Σ0π0is prohibited for the mass-overlapping Σ(1385). Combining a large aperture forward magnetic spectrometer and a central BGO crystal calorimeter, the BGO-OD experiment is ideally suited to measure this decay with theK+in the forward direction. Preliminary results are presented.*Supported by DFG (PN 388979758, 405882627)

Published
2020
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15. Erratum to: Strangeness Photoproduction at the BGO-OD Experiment

Author

J. Hannappel, Giuseppe Mandaglio, T. C. Jude, O. Freyermuth, P. Pedroni, B.-E. Reitz, D. Moricciani, D. Elsner, A. Polonski, A. Fantini, N. G. Kozlenko, F. Ghio, Patrick Bauer, Christian Tillmanns, D. Novinskiy, P. Levi Sandri, A. M. Lapik, V. V. Sumachev, K. Kohl, S. Alef, R. Beck, H. Schmieden, A. B. Gridnev, R. Messi, R. Di Salvo, P. Cole, V. Tarakanov, M. Romaniuk, V. Lisin, G. Scheluchin, V. G. Nedorezov, and D. Hammann

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Strangeness
Published
2020
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16. Combination of KLOE σ (e+e− → π+π−γ(γ)) measurements and determination of $$ {a}_{\mu}^{\pi^{+}{\pi}^{-}} $$ in the energy range 0.10 < s < 0.95 GeV2

Author

Paolo Santangelo, G. Venanzoni, P. Fermani, A. Passeri, Antonio Budano, N. Raha, E. P. Solodov, V. De Leo, P. A. Lukin, L. Tortora, Magnus Wolke, Stefan E. Müller, Michał Silarski, E. A. Kozyrev, Florin Sirghi, Wojciech Krzemien, D. Moricciani, S. Loffredo, P. Branchini, Aleksander Gajos, A. De Santis, Paweł Moskal, Gianfranco Morello, Filippo Ceradini, W. Wislicki, A. Selce, A. Keshavarzi, G. D'Agostini, E. Dané, M. Berlowski, S. Miscetti, A. Di Domenico, V. L. Ivanov, Vincenzo Patera, Andrzej Kupsc, Thomas Teubner, R. Messi, T. Johansson, B. Cao, Paolo Ciambrone, Marco Schioppa, D. Kisielewska-Kamińska, F. Bossi, G. Fantini, S. Giovannella, D. Domenici, P. De Simone, C. Bloise, Giuseppe Mandaglio, M. Martini, E. De Lucia, X. Kang, A. Fantini, D. Babusci, P. Gauzzi, A. Anastasi, A. D'Uffizi, E. Perez del Rio, Eryk Czerwiński, L. Caldeira Balkeståhl, Francesca Curciarello, S. Fiore, E. Graziani, A. Di Cicco, and Fiore, S.

Subjects
Physics, Nuclear and High Energy Physics, Range (particle radiation), Particle physics, e+-e- Experiments, Muon, Anomalous magnetic dipole moment, 010308 nuclear & particles physics, Hadron, State (functional analysis), Covariance, 01 natural sciences, 0103 physical sciences, Anomaly (physics), 010306 general physics, Energy (signal processing)
Abstract

The three precision measurements of the cross section σ(e + e − → π + π −γ(γ)) using initial state radiation by the KLOE collaboration provide an important input for the prediction of the hadronic contribution to the anomalous magnetic moment of the muon. These measurements are correlated for both statistical and systematic uncertainties and, therefore, the simultaneous use of these measurements requires covariance matrices that fully describe the correlations. We present the construction of these covariance matrices and use them to determine a combined KLOE measurement for σ(e + e − → π + π −γ(γ)). We find, from this combination, a two-pion contribution to the muon magnetic anomaly in the energy range 0.10 < s < 0.95 GeV2 of $$ {a}_{\mu}^{\pi^{+}{\pi}^{-}}=\left(489.8\pm {1.7}_{\mathrm{stat}}\pm {4.8}_{\mathrm{sys}}\right)\times {10}^{-10} $$ a μ π + π − = 489.8 ± 1.7 stat ± 4.8 s y s × 10 − 10 . Data vectors and covariance matrices are available at http://www.lnf.infn.it/kloe/ppg/ ppg_2017/ppg_2017.html.

Published
2018
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17. Strangeness photoproduction at the BGO-OD experiment

Author

V. Metag, V. Tarakanov, R. Joosten, O. Freyermuth, S. Friedrich, D. Burdeynyi, K. Kohl, Francesco Messi, A. Polonski, D. Novinskiy, Hans-Georg Zaunick, G. Gervino, J. Hannappel, J. Bieling, R. Messi, A. Fantini, Wolfgang Hillert, D. Hammann, K.-T. Brinkmann, D. Moricciani, P. L. Cole, R. Jahn, P. Pedroni, B. Krusche, Giuseppe Mandaglio, V. Lisin, D. Elsner, G. Scheluchin, A. Stugelev, A. M. Lapik, Frank Klein, R. Di Salvo, A. Bella, A. Braghieri, Reinhard Beck, Frank Frommberger, T. Zimmermann, A. N. Mushkarenkov, V. V. Sumachev, P. Levi Sandri, I. V. Lopatin, T. C. Jude, Patrick Bauer, E. Gutz, V. G. Nedorezov, D. Walther, S. Boese, V. Vegna, M. Romaniuk, S. Alef, B.-E. Reitz, F. Ghio, H. Schmieden, D. E. Bayadilov, A. B. Gridnev, and Mariana Nanova

Subjects
Settore FIS/01, Physics, Calorimeter (particle physics), Meson, Nuclear Theory, Momentum transfer, Hadron, Constituent quark, Strangeness, strangeness photoproduction, Baryon, Nuclear physics, Nuclear Experiment, Nucleon
Abstract

The BGO-OD experiment at the ELSA accelerator facility uses an energy tagged bremstrahlung photon beam to investigate the excitation spectrum of the nucleon. The setup consists of a highly segmented BGO calorimeter surrounding the target, with a particle tracking magnetic spectrometer at forward angles. BGO-OD is ideal for investigating the photoproduction of hadrons of non-zero strangeness. The high momentum resolution at forward angles covers a kinematic region where t-channel exchange mechanisms play a dominant role. Access to this low momentum transfer region also allows the investigation of degrees of freedom not derived from constituent quark models, for example, the role of (vector) meson - baryon interactions and dynamically generated states in photoproduction reactions. Data taking for the first part of an extensive physics programme is complete and preliminary results and ongoing analysis are presented. (Less)

Published
2018
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18. Measurement of the charge asymmetry for the KS → πeν decay and test of CPT symmetry with the KLOE detector

Author

The KLOE-2 collaboration, A. Anastasi, D. Babusci, M. Berlowski, C. Bloise, F. Bossi, P. Branchini, A. Budano, B. Cao, G. Capon, F. Ceradini, P. Ciambrone, F. Curciarello, E. Czerwinski, G. D’Agostini, E. Danè, V. De Leo, E. De Lucia, A. De Santis, P. De Simone, A. Di Cicco, A. Di Domenico, D. Domenici, A. D’Uffizi, A. Fantini, G. Fantini, P. Fermani, S. Fiore, A. Gajos, P. Gauzzi, S. Giovannella, E. Graziani, V. L. Ivanov, T. Johansson, X. Kang, D. Kisielewska-Kaminska, E. A. Kozyrev, W. Krzemien, A. Kupsć, S. Loffredo, P. A. Lukin, G. Mandaglio, M. Martini, R. Messi, S. Miscetti, D. Moricciani, P. Moskal, A. Passeri, V. Patera, E. Perez del Rio, N. Raha, P. Santangelo, M. Schioppa, A. Selce, M. Silarski, F. Sirghi, E. P. Solodov, L. Tortora, G. Venanzoni, W. Wislicki, M. Wolke, Fiore, S., Anastasi, A., Babusci, D., Berlowski, M., Bloise, C., Bossi, F., Branchini, P., Budano, A., Cao, B., Capon, G., Ceradini, F., Ciambrone, P., Curciarello, F., Czerwinski, E., D’Agostini, G., Danè, E., De Leo, V., De Lucia, E., De Santis, A., De Simone, P., Di Cicco, A., Di Domenico, A., Domenici, D., D’Uffizi, A., Fantini, A., Fantini, G., Fermani, P., Gajos, A., Gauzzi, P., Giovannella, S., Graziani, E., Ivanov, V. L., Johansson, T., Kang, X., Kisielewska-Kaminska, D., Kozyrev, E. A., Krzemien, W., Kupsć, A., Loffredo, S., Lukin, P. A., Mandaglio, G., Martini, M., Messi, R., Miscetti, S., Moricciani, D., Moskal, P., Passeri, A., Patera, V., Perez del Rio, E., Raha, N., Santangelo, P., Schioppa, M., Selce, A., Silarski, M., Sirghi, F., Solodov, E. P., Tortora, L., Venanzoni, G., Wislicki, W., and Wolke, M.

Subjects
Semileptonic decay, e+-e- Experiment, Particle physics, Nuclear and High Energy Physics, CPT symmetry, media_common.quotation_subject, e+-e- Experiments, CP violation, Flavor physics, 01 natural sciences, Asymmetry, Luminosity, Subatomär fysik, 0103 physical sciences, Subatomic Physics, Pi, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, CP violation, e+-e- Experiments, 010306 general physics, media_common, Physics, CP violation, e+-e- Experiments, Flavor physics, 010308 nuclear & particles physics, Detector, Settore FIS/01 - Fisica Sperimentale, Charge (physics), e plus -e- Experiments, Flavor physic, lcsh:QC770-798
Abstract

Using 1.63 fb−1 of integrated luminosity collected by the KLOE experiment about 7 × 104 K S → π ± e ∓ ν decays have been reconstructed. The measured value of the charge asymmetry for this decay is A S = (−4.9 ± 5.7stat ± 2.6syst) × 10−3, which is almost twice more precise than the previous KLOE result. The combination of these two measurements gives A S = (−3.8 ± 5.0stat ± 2.6syst) × 10−3 and, together with the asymmetry of the K L semileptonic decay, provides significant tests of the CPT symmetry. The obtained results are in agreement with CPT invariance.

Published
2018
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19. Combined limit on the production of a light gauge boson decaying into mu(+) mu(-) and pi(+) pi(-)

Author

P.A. Lukin, E. P. Solodov, E. Perez del Rio, A. D'Uffizi, D. Kisielewska-Kamińska, Michał Silarski, Filippo Ceradini, Paolo Ciambrone, G. Venanzoni, P. Fermani, V. L. Ivanov, P. De Simone, Paweł Moskal, A. De Santis, R. Messi, T. Johansson, G. Fantini, Eryk Czerwiński, E. Dané, Francesca Curciarello, D. Domenici, S. Giovannella, F. Bossi, Antonio Budano, C. Bloise, A. Anastasi, L. Tortora, A. Selce, Marco Schioppa, A. Di Domenico, Giuseppe Mandaglio, Magnus Wolke, P. Gauzzi, S. Miscetti, X. Kang, D. Babusci, N. Raha, A. Fantini, V. De Leo, Florin Sirghi, Vincenzo Patera, Andrzej Kupsc, Wojciech Krzemien, P. Branchini, E. De Lucia, M. Martini, Paolo Santangelo, D. Moricciani, G. D'Agostini, E.A. Kozyrev, A. Di Cicco, A. Passeri, S. Fiore, E. Graziani, Wojciech Wiślicki, M. Berlowski, B. Cao, Aleksander Gajos, Anastasi, A., Babusci, D., Berlowski, M., Bloise, C., Bossi, F., Branchini, P., Budano, A., Cao, B., Ceradini, F., Ciambrone, P., Curciarello, F., Czerwiński, E., D'Agostini, G., Danè, E., De Leo, V., De Lucia, E., De Santis, A., De Simone, P., Di Cicco, A., Di Domenico, A., Domenici, D., D'Uffizi, A., Fantini, A., Fantini, G., Fermani, P., Fiore, S., Gajos, A., Gauzzi, P., Giovannella, S., Graziani, E., Ivanov, V. L., Johansson, T., Kang, X., Kisielewska-Kamińska, D., Kozyrev, E. A., Krzemien, W., Kupsc, A., Lukin, P. A., Mandaglio, G., Martini, M., Messi, R., Miscetti, S., Moricciani, D., Moskal, P., Passeri, A., Patera, V., Perez del Rio, E., Raha, N., Santangelo, P., Schioppa, M., Selce, Andrea, Silarski, M., Sirghi, F., Solodov, E. P., Tortora, L., Venanzoni, G., Wiślicki, W., and Wolke, M.

Subjects
Nuclear and High Energy Physics, Dark forces, e(+) e(-) Collisions, High Energy Physics::Lattice, Electron–positron annihilation, Hadron, Radiation, 01 natural sciences, e+e− Collision, Dark photon, High Energy Physics - Experiment, Subatomär fysik, High Energy Physics::Theory, e+e- Collisions, Dark forces. Gauge vector boson, Upper limits, Astronomi, astrofysik och kosmologi, 0103 physical sciences, Subatomic Physics, Astronomy, Astrophysics and Cosmology, Limit (mathematics), e + e − Collisions, Gauge vector boson, Upper limits, 010306 general physics, Condensed Matter::Quantum Gases, Coupling constant, Physics, Gauge boson, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Settore FIS/01 - Fisica Sperimentale, Upper limit, Fine-structure constant, lcsh:QC1-999, Dark force, High Energy Physics::Experiment, Atomic physics, lcsh:Physics
Abstract

We searched for the $\mu^+\mu^-$ decay of a light vector gauge boson, also known as dark photon, in the $e^+ e^- \to \mu^+ \mu^- \gamma_{\rm ISR}$ process by means of the Initial State Radiation (ISR) method. We used 1.93~fb$^{-1}$ of data collected by the KLOE experiment at the DA$\Phi$NE $\phi$-factory. No structures have been observed over the irreducible $\mu^+ \mu^-$ background. A 90\% CL limit on the ratio $\varepsilon^2=\alpha^{\prime}/\alpha$ between the dark coupling constant and the fine structure constant of $ 3\times 10^{-6}-2\times 10^{-7}$ has been set in the dark photon mass region between 519 MeV and 973 MeV. This new limit has been combined with the published result obtained investigating the hypothesis of the dark photon decaying into hadrons in $e^+ e^- \to \pi^+ \pi^- \gamma_{\rm ISR}$ events. The combined 90\% CL limit increases the sensitivity especially in the $\rho-\omega$ interference region and excludes $\varepsilon^2$ greater than $(13-2)\times 10^{-7}$. For dark photon masses greater than 600 MeV the combined limit is lower than 8~$\times\, 10^{-7}$ resulting more stringent than present constraints from other experiments., Comment: 7 pages, 9 figures, 1 table, accepted for publication in Physics Letters B

Published
2018

20. A compact Time-Of-Flight detector for space applications: The LIDAL system

Author

G. Nobili, C. Manea, Alessandro Rizzo, Francesco Tommasino, D. Pecchi, Enzo Reali, M. C. Morone, M. Iannilli, P. Picozza, Livio Narici, M. Rovituso, G. Vitali, L. Di Fino, P. Cipollone, G. Masciantonio, R. Messi, C. La Tessa, and C. De Donato

Subjects
Physics, Charged particle detectorTOFTime-Of-FlightTime resolutionSpaceInternational space stationScintillators, Nuclear and High Energy Physics, Time of flight detector, Physics::Instrumentation and Detectors, business.industry, Detector, Settore FIS/01 - Fisica Sperimentale, PID controller, Scintillator, 01 natural sciences, Particle identification, Settore FIS/07 - Fisica Applicata(Beni Culturali, Ambientali, Biol.e Medicin), 030218 nuclear medicine & medical imaging, 03 medical and health sciences, 0302 clinical medicine, Optics, Upgrade, Beamline, 0103 physical sciences, International Space Station, business, 010303 astronomy & astrophysics, Instrumentation
Abstract

LIDAL (Light Ion Detector for ALTEA system) is a compact detector designed to upgrade ALTEA (Anomalous Long Term Effects on Astronauts) silicon detector apparatus, in order to study in detail the low-Z part of ions spectrum inside the International Space Station (ISS) and to enhance the Particle Identification (PID) capability of the system. The new detector is designed to trigger ALTEA and to perform Time-Of-Flight measurements. It is based on plastic scintillators for fast timing applications read by Photo-Multiplier-Tubes (PMTs). A custom Front End Electronics (FEE) has been designed to reach time resolutions less than 100 ps ( σ ) for protons. A LIDAL prototype has been developed at the University of Rome Tor Vergata to test the timing performance of the scintillators, the PMTs and of the custom FEE using the proton beam line at the TIFPA (Trento Institute for Fundamentals Physics Applications) center in Trento, Italy. The results of these tests are reported and discussed. They have also been used for a preliminary evaluation of the Particle Identification (PID) capability of the final LIDAL-ALTEA detector system in response to the ions spectra expected on-board the ISS.

Published
2018

21. Limit on the production of a low-mass vector boson ine+e−→Uγ,U→e+e−with the KLOE experiment

Author

B. Cao, A. Ranieri, M. Martini, M. Papenbrock, F. Bossi, C. Bloise, R. Messi, G. D'Agostini, E. Dané, T. Johansson, Wojciech Krzemien, Wojciech Wiślicki, A. Di Cicco, F. Sirghi, P. Branchini, Daria Kamińska, S. Miscetti, D. Domenici, V. De Leo, G. Bencivenni, S. Giovannella, Antonio Budano, P. De Simone, G. Venanzoni, A. Fantini, A. Anastasi, S. Fiore, S. Loffredo, E. Graziani, F. Curciarello, Filippo Ceradini, D. Babusci, A. D'Uffizi, Lena Heijkenskjöld, L. Tortora, F. Happacher, Paolo Ciambrone, W. Ikegami Andersson, D. Moricciani, Eryk Czerwiński, R. Di Salvo, A. De Santis, L. Caldeira Balkeståhl, I. Sarra, E. De Lucia, Giuseppe Mandaglio, Paweł Moskal, M. Mascolo, A. Di Domenico, Paolo Santangelo, A. Palladino, Michał Silarski, Vincenzo Patera, Andrzej Kupsc, Gianfranco Morello, G. Felici, Magnus Wolke, P. Gauzzi, A. Passeri, Aleksander Gajos, M. Berlowski, G. Giardina, Marco Schioppa, and E. Perez del Rio

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Electron–positron annihilation, Physics beyond the Standard Model, Dark matter, 01 natural sciences, Dark photon, Vector boson, 0103 physical sciences, Production (computer science), Limit (mathematics), 010306 general physics, Low Mass
Abstract

The existence of a new force beyond the Standard Model is compelling because it could explain several striking astrophysical observations which fail standard interpretations. We searched for the li ...

Published
2015
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22. Measurement of the inclusive $\phi$ cross-section in pp collisions at $\sqrt{s}$ = 7 TeV

Author

G. Manca, W. Witzeling, J. Harrison, G. Martellotti, S. Ogilvy, B. Gui, John Back, G. Passaleva, F. Xing, R. Silva Coutinho, J. Luisier, Ross D. Young, Paolo Gandini, A. Solomin, B. Maynard, J. Merkel, A. A. Affolder, J. Anderson, W. D. Hulsbergen, E. Perez Trigo, M. Grabalosa Gándara, Lars Eklund, N. Lopez-March, T. Britton, S. Swientek, A. Ukleja, S. Topp-Joergensen, W. C. Zhang, Eduardo Rodrigues, V. Niess, M. Sannino, Ziad Ajaltouni, D. A. Milanes, T. Gys, William Barter, Angelo Carbone, Hugh Philip Skottowe, M. Deckenhoff, Jaap Velthuis, Pascal Perret, J. J. Saborido Silva, Antonio Pellegrino, R. Cardinale, B. Khanji, P. Rodriguez Perez, L. Garrido, V. Tisserand, E. Grauges, M. Sapunov, Roger Forty, Carmelo D'Ambrosio, F. Machefert, F. Kruse, L. Wiggers, F. F. Wilson, Th. S. Bauer, G. Valenti, L. Del Buono, E. Polycarpo, Tatsuya Nakada, S. Benson, G. N. Patrick, K. Holubyev, J. M. Otalora Goicochea, F. Teubert, A. Petrolini, D. L. Perego, G. Bencivenni, A. Keune, A. Gomes, L. A. Granado Cardoso, S. Malde, J. M. Caicedo Carvajal, R. Märki, J. Serrano, J. Lefrançois, Albert Bursche, Marianna Fontana, M. Coombes, N. H. Brook, Pavel Shatalov, C. Langenbruch, Jonas Rademacker, C. Göbel, P. Seyfert, Hans Dijkstra, B. Storaci, O. Shevchenko, C. Gaspar, Paul Fraser Harrison, Krzysztof Grzegorz Sobczak, D. Wiedner, A. D. Webber, A. Satta, G. Pessina, S. Furcas, Jing Wang, A. Mazurov, P. Jaton, F. Stagni, R. S. Huston, P. Hunt, G. Penso, P. Collins, D. van Eijk, D. E. Hutchcroft, Ph. Charpentier, Ulrik Egede, B. Popovici, V. Gibson, J. Blouw, J. H. Lopes, Stephen M. Stahl, B. Viaud, O. Yushchenko, S. Blusk, Jan Buytaert, Ignacio Bediaga, P. M. Bjørnstad, A. Falabella, A. Puig Navarro, Stephane T'Jampens, A. Shires, M. Plo Casasus, F. Constantin, D. Martinez Santos, S. Vecchi, F. Dupertuis, Wander Baldini, P. Alvarez Cartelle, S. Kandybei, C. Salzmann, L. Li, Patrick Koppenburg, Yongsun Kim, J. Garofoli, C. Patrignani, Nicola Serra, Sandra Amato, N. Neufeld, Alessandro Camboni, Marcin Kucharczyk, W. Qian, N. Sagidova, J. Panman, C. Satriano, Thomas Blake, Chung Nguyen-Mau, D. R. Johnson, Lei Zhang, I. Raniuk, Pierluigi Campana, K. Belous, M. Seco, Sandro Cadeddu, I. V. Machikhiliyan, K. Kreplin, L. Esteve, G. Auriemma, A. Contu, T. Ruf, David D'Enterria, A. Martín Sánchez, J. Visniakov, G. Lanfranchi, M.-N. Minard, Olivier Leroy, E. G. Zverev, C. R. Jones, D. Moran, U. Marconi, E. Lopez Asamar, Yasmine Amhis, I. De Bonis, G. Conti, B. Jost, C. Coca, G. Alkhazov, A. Bien, A. A. Alves, E. Maurice, R. Graciani Diaz, Neville Harnew, N. Chiapolini, R. Lindner, T. du Pree, A. Vorobyev, R. Currie, M. P. Williams, S. Hansmann-Menzemer, A. Schopper, M. H. Schune, U. Uwer, O. Schneider, M. De Cian, M. Benayoun, G. Mancinelli, Conor Fitzpatrick, G. Carboni, S. A. Wotton, M. van Beuzekom, T. Huse, C. Adrover, P. Hopchev, P. Diniz Batista, C. Linn, C. Blanks, J. Dickens, M. Nedos, A. Vollhardt, J. Palacios, G. Sabatino, P. Urquijo, Michael Alexander, E. Ben-Haim, M. Veltri, A. Papanestis, M. Pepe Altarelli, Marco Gersabeck, J. Bressieux, M. Calvo Gomez, T. Brambach, Guoming Liu, I. Nasteva, A. Gallas Torreira, C. Bauer, E. Lanciotti, Andrea Bizzeti, S. Miglioranzi, D. Websdale, T. Lesiak, Marco Clemencic, S. Farry, Gianluigi Casse, M. Tobin, G. Corti, Markus Frank, D. S. Bailey, Patrick Robbe, D. Hynds, D. Galli, Yuehong Xie, Marina Artuso, Karol Hennessy, C. Barschel, K. Müller, Rajesh Kumar, Laurence Carson, Tjeerd Ketel, K. Kruzelecki, C. Parkes, C. J. Parkinson, T. M. Karbach, Nikolay Bondar, C. Bozzi, K. Senderowska, O. Okhrimenko, Ph. Ghez, E. Jans, R. Dzhelyadin, A. Lai, S. Filippov, Howard Gordon, F. Eisele, J. Nardulli, A. Pazos Alvarez, M. Charles, J. P. Lees, Mikhail Zavertyaev, Yu. Guz, B. B. Shao, Themistocles Bowcock, R. Mountain, M. Meissner, P. De Simone, N. Tuning, J. Wishahi, B. Jean-Marie, R. Vazquez Gomez, E. Teodorescu, B. Saitta, F. Dettori, S. Stoica, G. Krocker, H. V. 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Monteil, L. Li Gioi, Nikolay Nikitin, A. Artamonov, M. T. Tran, D. Voong, R. Le Gac, F. Ferreira Rodrigues, Diego Alejandro Roa Romero, C. Matteuzzi, S. Koblitz, A. Bay, R. M. D. Mamunur, Alexander Leflat, N. A. Smith, X. Cid Vidal, F. Muheim, E. van Herwijnen, Manuel Schiller, M. M. Reid, P. E. L. Clarke, U. Straumann, Olivier Deschamps, Roland Bernet, T. Pilar, R. Ekelhof, S. Gregson, S. Wandernoth, O. Steinkamp, G. Wilkinson, D. Esperante Pereira, A. C. dos Reis, G. D. Patel, V. Vagnoni, G. Haefeli, V. Fernandez Albor, Silvia Borghi, Pavel Krokovny, J. van Leerdam, G. Raven, D. Decamp, A. Golutvin, Alexander Bondar, M. Karacson, M. Knecht, K. Wacker, Alessio Sarti, T. J. Gershon, M. Witek, Dmitry Golubkov, O. Callot, Victor Coco, J. Magnin, R. Harji, H. Degaudenzi, M. Needham, Elie Aslanides, Valery Pugatch, I. Shapoval, M. Deissenroth, A. Powell, J. V. Morris, B. Rakotomiaramanana, O. Maev, Tomasz Skwarnicki, A. Cook, J. van Tilburg, S. Oggero, Sebastian Bachmann, B. Pie Valls, A. Zhelezov, V. Bocci, V. Obraztsov, Pierre Henrard, Johannes Albrecht, Malcolm John, S. Playfer, D. Pinci, Stephan Eisenhardt, A. Grecu, M. Gandelman, S. De Capua, R. Santinelli, G. Fardell, E. Santovetti, V. Egorychev, Roger Barlow, F. De Lorenzi, A. Pérez-Calero Yzquierdo, N. Gauvin, V. Iakovenko, F. Maciuc, V. Fave, E. Gushchin, A. Kozlinskiy, A. Dovbnya, Bernardo Adeva, R. Nandakumar, D. Dossett, Philip Ilten, D. R. Ward, G. J. Rogers, S. Perazzini, Marc S. Williams, J-C. Garnier, L. De Paula, S. Nies, A. Bates, G. D. Lafferty, R. W. Lambert, M. Perrin-Terrin, F. Jansen, C. Deplano, G. Polok, I. Mous, M. Shapkin, Y. Shcheglov, T. Kvaratskheliya, Tomasz Szumlak, R. Jacobsson, Marc-Olivier Bettler, S. Schleich, Audrey Jaeger, A. Sciubba, R. Muresan, V. Balagura, C. Eames, Werner Hofmann, R. Santacesaria, Julien Cogan, S. Brisbane, C. Haen, R. Plackett, F. Fontanelli, J. Rouvinet, R. McNulty, M. Matveev, Zishuo Yang, M. Palutan, V. V. Gligorov, F. F. Jing, P. Morawski, K. Wyllie, W. Bonivento, B. Pietrzyk, M. Savrie, L. Zhong, M. Merk, H. Voss, P. Naik, R. Oldeman, D. Savrina, L. Arrabito, M. Schmelling, Marwa Jahjah-Hussein, B. Schmidt, A. Bobrov, E. Fanchini, A. Petrella, L. Martin, M. Nicol, P. Spradlin, J. Prisciandaro, M. Pappagallo, U. Kerzel, T. E. Latham, Z. Mathe, Nicholas Adam Styles, C. Thomas, D. Lambert, J. F. J. van den Brand, S. Kukulak, Simone Bifani, V. Romanovsky, F. Blanc, R. Lefèvre, S.I. Eidelman, S. Ricciardi, S. Redford, Christoph Frei, G. Graziani, R. Messi, P. Vazquez Regueiro, Dmitry Popov, Yang Li, S. Easo, Marco Cattaneo, Agnieszka Oblakowska-Mucha, A. Borgia, C. Pavel-Nicorescu, B. Souza De Paula, K. Vervink, C. Mclean, T. Hampson, B. K. Pal, Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Calcul de l'IN2P3 (CC-IN2P3), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Annecy de Physique des Particules (LAPP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), LHCb, Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC), LHCb Collaboration, (Astro)-Particles Physics, Aaij, R, Adinolfi, M, Adrover, C, Affolder, A, Ajaltouni, Z, Albrecht, 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T'Jampens, S, Teodorescu, E, Teubert, F, Thomas, C, Thomas, E, van Tilburg, J, Tisserand, V, Tobin, M, Topp Joergensen, S, Tran, M, Tsaregorodtsev, A, Tuning, N, Ukleja, A, Urquijo, P, Uwer, U, Vagnoni, V, Valenti, G, Vazquez Gomez, R, Vazquez Regueiro, P, Vecchi, S, Velthuis, J, Veltri, M, Vervink, K, Viaud, B, Videau, I, Vilasis Cardona, X, Visniakov, J, Vollhardt, A, Voong, D, Vorobyev, A, Voss, H, Wacker, K, Wandernoth, S, Wang, J, Ward, D, Webber, A, Websdale, D, Whitehead, M, Wiedner, D, Wiggers, L, Wilkinson, G, Williams, M, Wilson, F, Wishahi, J, Witek, M, Witzeling, W, Wotton, S, Wyllie, K, Xie, Y, Xing, F, Yang, Z, Young, R, Yushchenko, O, Zavertyaev, M, Zhang, L, Zhang, W, Zhang, Y, Zhelezov, A, Zhong, L, Zverev, E, Zvyagin, A, DIP. DI FISICA, DIPARTIMENTO DI FISICA E ASTRONOMIA 'AUGUSTO RIGHI', SECONDA FACOLTA' DI INGEGNERIA DELL'UNIVERSITA' DI BOLOGNA CON SEDE CESENA, AREA MIN. 02 - Scienze fisiche, Da definire, R. Aaij, B. Adeva, M. Adinolfi, C. Adrover, A. Affolder, Z. Ajaltouni, J. Albrecht, F. Alessio, M. Alexander, G. Alkhazov, P. Alvarez Cartelle, A.A. Alves Jr, S. Amato, Y. Amhi, J. Anderson, R.B. Appleby, O. Aquines Gutierrez, L. Arrabito, A. Artamonov, M. Artuso, E. Aslanide, G. Auriemma, S. Bachmann, J.J. Back, D.S. Bailey, V. Balagura, W. Baldini, R.J. Barlow, C. Barschel, S. Barsuk, W. Barter, A. Bate, C. Bauer, Th. Bauer, A. Bay, I. Bediaga, K. Belou, I. Belyaev, E. Ben-Haim, M. Benayoun, G. Bencivenni, S. Benson, J. Benton, R. Bernet, M.-O. Bettler, M. van Beuzekom, A. Bien, S. Bifani, A. Bizzeti, P.M. Bjørnstad, T. Blake, F. Blanc, C. Blank, J. Blouw, S. Blusk, A. Bobrov, V. Bocci, A. Bondar, N. Bondar, W. Bonivento, S. Borghi, A. Borgia, T.J.V. Bowcock, C. Bozzi, T. Brambach, J. van den Brand, J. Bressieux, D. Brett, S. Brisbane, M. Britsch, T. Britton, N.H. Brook, A. Büchler-Germann, A. Bursche, J. Buytaert, S. Cadeddu, J.M. Caicedo Carvajal, O. Callot, M. Calvi, M. Calvo Gomez, A. Camboni, P. Campana, A. Carbone, G. Carboni, R. Cardinale, A. Cardini, L. Carson, K. Carvalho Akiba, G. Casse, M. Cattaneo, M. Charle, Ph. Charpentier, N. Chiapolini, X. Cid Vidal, P.E.L. Clarke, M. Clemencic, H.V. Cliff, J. Closier, C. Coca, V. Coco, J. Cogan, P. Collin, F. Constantin, G. Conti, A. Contu, A. Cook, M. Coombe, G. Corti, G.A. Cowan, R. Currie, B. D'Almagne, C. D'Ambrosio, P. David, I. De Boni, S. De Capua, M. De Cian, F. De Lorenzi, J.M. De Miranda, L. De Paula, P. De Simone, D. Decamp, M. Deckenhoff, H. Degaudenzi, M. Deissenroth, L. Del Buono, C. Deplano, O. Deschamp, F. Dettori, J. Dicken, H. Dijkstra, P. Diniz Batista, D. Dossett, A. Dovbnya, F. Dupertui, R. Dzhelyadin, C. Eame, S. Easo, U. Egede, V. Egorychev, S. Eidelman, D. van Eijk, F. Eisele, S. Eisenhardt, R. Ekelhof, L. Eklund, Ch. Elsasser, D.G. d'Enterria, D. Esperante Pereira, L. Estève, A. Falabella, E. Fanchini, C. Färber, G. Fardell, C. Farinelli, S. Farry, V. Fave, V. Fernandez Albor, M. Ferro-Luzzi, S. Filippov, C. Fitzpatrick, M. Fontana, F. Fontanelli, R. Forty, M. Frank, C. Frei, M. Frosini, S. Furca, A. Gallas Torreira, D. Galli, M. Gandelman, P. Gandini, Y. Gao, J-C. Garnier, J. Garofoli, J. Garra Tico, L. Garrido, C. Gaspar, N. Gauvin, M. Gersabeck, T. Gershon, Ph. Ghez, V. Gibson, V.V. Gligorov, C. Göbel, D. Golubkov, A. Golutvin, A. Gome, H. Gordon, M. Grabalosa Gándara, R. Graciani Diaz, L.A. Granado Cardoso, E. Graugé, G. Graziani, A. Grecu, S. Gregson, B. Gui, E. Gushchin, Yu. Guz, T. Gy, G. Haefeli, C. Haen, S.C. Haine, T. Hampson, S. Hansmann-Menzemer, R. Harji, N. Harnew, J. Harrison, P.F. Harrison, J. He, V. Heijne, K. Hennessy, P. Henrard, J.A. Hernando Morata, E. van Herwijnen, W. Hofmann, K. Holubyev, P. Hopchev, W. Hulsbergen, P. Hunt, T. Huse, R.S. Huston, D. Hutchcroft, D. Hynd, V. Iakovenko, P. Ilten, J. Imong, R. Jacobsson, A. Jaeger, M. Jahjah Hussein, E. Jan, F. Jansen, P. Jaton, B. Jean-Marie, F. Jing, M. John, D. Johnson, C.R. Jone, B. Jost, S. Kandybei, M. Karacson, T.M. Karbach, J. Keaveney, U. Kerzel, T. Ketel, A. Keune, B. Khanji, Y.M. Kim, M. Knecht, S. Koblitz, P. Koppenburg, A. Kozlinskiy, L. Kravchuk, K. Kreplin, G. Krocker, P. Krokovny, F. Kruse, K. Kruzelecki, M. Kucharczyk, S. Kukulak, R. Kumar, T. Kvaratskheliya, V.N. La Thi, D. Lacarrere, G. Lafferty, A. Lai, D. Lambert, R.W. Lambert, E. Lanciotti, G. Lanfranchi, C. Langenbruch, T. Latham, R. Le Gac, J. van Leerdam, J.-P. Lee, R. Lefèvre, A. Leflat, J. Lefrançoi, O. Leroy, T. Lesiak, L. Li, Y.Y. Li, L. Li Gioi, M. Lieng, R. Lindner, C. Linn, B. Liu, G. Liu, J.H. Lope, E. Lopez Asamar, N. Lopez-March, J. Luisier, F. Machefert, I.V. Machikhiliyan, F. Maciuc, O. Maev, J. Magnin, S. Malde, R.M.D. Mamunur, G. Manca, G. Mancinelli, N. Mangiafave, U. Marconi, R. Märki, J. Mark, G. Martellotti, A. Marten, L. Martin, A. Martín Sánchez, D. Martinez Santo, A. Massafferri, Z. Mathe, C. Matteuzzi, M. Matveev, E. Maurice, B. Maynard, A. Mazurov, G. McGregor, R. McNulty, C. Mclean, M. Meissner, M. Merk, J. Merkel, R. Messi, S. Miglioranzi, D.A. Milane, M.-N. Minard, S. Monteil, D. Moran, P. Morawski, J.V. Morri, R. Mountain, I. Mou, F. Muheim, K. Müller, R. Muresan, B. Muryn, M. Musy, P. Naik, T. Nakada, R. Nandakumar, J. Nardulli, I. Nasteva, M. Nedo, M. Needham, N. Neufeld, C. Nguyen-Mau, M. Nicol, S. Nie, V. Nie, N. Nikitin, A. Oblakowska-Mucha, V. Obraztsov, S. Oggero, S. Ogilvy, O. Okhrimenko, R. Oldeman, M. Orlandea, J.M. Otalora Goicochea, B. Pal, J. Palacio, M. Palutan, J. Panman, A. Papanesti, M. Pappagallo, C. Parke, C.J. Parkinson, G. Passaleva, G.D. Patel, M. Patel, S.K. Paterson, G.N. Patrick, C. Patrignani, C. Pavel-Nicorescu, A. Pazos Alvarez, A. Pellegrino, G. Penso, M. Pepe Altarelli, S. Perazzini, D.L. Perego, E. Perez Trigo, A. Pérez-Calero Yzquierdo, P. Perret, M. Perrin-Terrin, G. Pessina, A. Petrella, A. Petrolini, B. Pie Vall, B. Pietrzyk, T. Pilar, D. Pinci, R. Plackett, S. Playfer, M. Plo Casasu, G. Polok, A. Poluektov, E. Polycarpo, D. Popov, B. Popovici, C. Potterat, A. Powell, T. du Pree, J. Prisciandaro, V. Pugatch, A. Puig Navarro, W. Qian, J.H. Rademacker, B. Rakotomiaramanana, I. Raniuk, G. Raven, S. Redford, M.M. Reid, A.C. dos Rei, S. Ricciardi, K. Rinnert, D.A. Roa Romero, P. Robbe, E. Rodrigue, F. Rodrigue, P. Rodriguez Perez, G.J. Roger, V. Romanovsky, J. Rouvinet, T. Ruf, H. Ruiz, G. Sabatino, J.J. Saborido Silva, N. Sagidova, P. Sail, B. Saitta, C. Salzmann, M. Sannino, R. Santacesaria, R. Santinelli, E. Santovetti, M. Sapunov, A. Sarti, C. Satriano, A. Satta, M. Savrie, D. Savrina, P. Schaack, M. Schiller, S. Schleich, M. Schmelling, B. Schmidt, O. Schneider, A. Schopper, M.-H. Schune, R. Schwemmer, A. Sciubba, M. Seco, A. Semennikov, K. Senderowska, N. Serra, J. Serrano, P. Seyfert, B. Shao, M. Shapkin, I. Shapoval, P. Shatalov, Y. Shcheglov, T. Shear, L. Shekhtman, O. Shevchenko, V. Shevchenko, A. Shire, R. Silva Coutinho, H.P. Skottowe, T. Skwarnicki, A.C. Smith, N.A. Smith, K. Sobczak, F.J.P. Soler, A. Solomin, F. Soomro, B. Souza De Paula, B. Spaan, A. Sparke, P. Spradlin, F. Stagni, S. Stahl, O. Steinkamp, S. Stoica, S. Stone, B. Storaci, U. Straumann, N. Style, S. Swientek, M. Szczekowski, P. Szczypka, T. Szumlak, S. T'Jampen, E. Teodorescu, F. Teubert, C. Thoma, E. Thoma, J. van Tilburg, V. Tisserand, M. Tobin, S. Topp-Joergensen, M.T. Tran, A. Tsaregorodtsev, N. Tuning, A. Ukleja, P. Urquijo, U. Uwer, V. Vagnoni, G. Valenti, R. Vazquez Gomez, P. Vazquez Regueiro, S. Vecchi, J.J. Velthui, M. Veltri, K. Vervink, B. Viaud, I. Videau, X. Vilasis-Cardona, J. Visniakov, A. Vollhardt, D. Voong, A. Vorobyev, H. Vo, K. Wacker, S. Wandernoth, J. Wang, D.R. Ward, A.D. Webber, D. Websdale, M. Whitehead, D. Wiedner, L. Wigger, G. Wilkinson, M.P. William, M. William, F.F. Wilson, J. Wishahi, M. Witek, W. Witzeling, S.A. Wotton, K. Wyllie, Y. Xie, F. Xing, Z. Yang, R. Young, O. Yushchenko, M. Zavertyaev, L. Zhang, W.C. Zhang, Y. Zhang, A. Zhelezov, L. Zhong, E. Zverev, and A. Zvyagin

Subjects
Nuclear and High Energy Physics, Particle physics, Proton, cross-section, LHC, inclusive meson production, MESON PRODUCTION, +10+GeV%29%3A+Inclusive+production+with+identified+hadrons%22">Hadron-induced high- and super-high-energy interactions (energy > 10 GeV): Inclusive production with identified hadrons, Hadronic decays of J/ψ Υ and other quarkonia, FOS: Physical sciences, PROTON, 7. Clean energy, 01 natural sciences, High Energy Physics - Experiment, NO, Settore FIS/04 - Fisica Nucleare e Subnucleare, Nuclear physics, Cross section (physics), High Energy Physics - Experiment (hep-ex), 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Rapidity, SDG 7 - Affordable and Clean Energy, 010306 general physics, Nuclear Experiment, QC, Physics, Large Hadron Collider, 010308 nuclear & particles physics, Generator (category theory), +10+GeV%29%3A+Inclusive+production+with+identified+hadron%22">Hadron-induced high- and super-high-energy interactions (energy > 10 GeV): Inclusive production with identified hadron, Phi meson, FIS/01 - FISICA SPERIMENTALE, Transverse momentum, High Energy Physics::Experiment, Cross-section, LHC, Energy (signal processing), FIS/04 - FISICA NUCLEARE E SUBNUCLEARE, Particle Physics - Experiment
Abstract

The cross-section for inclusive phi meson production in pp collisions at a centre-of-mass energy of sqrt(s) = 7 TeV has been measured with the LHCb detector at the Large Hadron Collider. The differential cross-section is measured as a function of the phi transverse momentum p_T and rapidity y in the region 0.6 < p_T < 5.0 GeV/c and 2.44 < y < 4.06. The cross-section for inclusive phi production in this kinematic range is sigma(pp -> phi X) = 1758 pm 19(stat) ^{+43}_{-14}(syst) pm 182(scale) microbarn, where the first systematic uncertainty depends on the p_T and y region and the second is related to the overall scale. Predictions based on the Pythia 6.4 generator underestimate the cross-section., 10 pages, 2 figures

Published
2011
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23. Search for light vector boson production ine+e−→μ+μ−γinteractions with the KLOE experiment

Author

R. Messi, T. Johansson, S. Giovannella, Aleksander Gajos, Antonio Budano, S. Miscetti, K. Kacprzak, F. Bossi, R. Di Salvo, E. Dané, G. Felici, Vincenzo Patera, Andrzej Kupsc, S. Loffredo, Wojciech Wiślicki, Paweł Moskal, M. Martemianov, F. Happacher, Jarosław Zdebik, G. Giardina, Daria Kamińska, D. Domenici, P. De Simone, Gianfranco Morello, A. Passeri, A. Di Cicco, Marco Schioppa, Magnus Wolke, P. Gauzzi, F. Loddo, G. Venanzoni, A. De Santis, M. Mascolo, C. Bloise, Michał Silarski, A. Ranieri, F. Nguyen, Barbara Sciascia, M. Martini, A. Di Domenico, G. De Robertis, P. Santangelo, A. Palladino, Eryk Czerwiński, L. Caldeira Balkeståhl, I. Sarra, O. Erriquez, S. Fiore, Bo Höistad, G. Fanizzi, E. Graziani, G. Bencivenni, D. Babusci, V. De Leo, D. Moricciani, F. Ceradini, E. De Lucia, I. Balwierz-Pytko, Giuseppe Mandaglio, I. Prado Longhi, P. Franzini, J. Lee-Franzini, Lena Heijkenskjöld, Wojciech Krzemien, P. Branchini, P. Ciambrone, Francesca Curciarello, L. Tortora, and A. Fantini

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle decay, Particle physics, Antiparticle, Electron–positron annihilation, Antimatter, High Energy Physics::Experiment, Elementary particle, Vector boson, Boson, Lepton
Abstract

We have searched for a light vector boson U, the possible carrier of a "dark force", with the KLOE detector at the DA Phi NE e(+)e(-) collider, motivated by astrophysical evidence for the presence of dark matter in the Universe. Using e(+)e(-) collisions collected with an integrated luminosity of 239.3 pb(-1), we look for a dimuon mass peak in the reaction e(+)e(-) -> mu(+)mu(-)gamma, corresponding to the decay U -> mu(+)mu(-). We find no evidence for a U vector boson signal. We set a 90% CL upper limit for the mixing parameter squared between the photon and the U boson of 1.6 x 10(-5) to 8.6 x 10(-7) for the mass region 520 < m(U) < 980 MeV.

Published
2014
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24. Precision measurements of the e+e−→π+π−(γ) cross section with the KLOE detector

Author

G. Mandaglio, D. Babusci, D. Badoni, I. Balwierz-Pytko, G. Bencivenni, C. Bini, C. Bloise, F. Bossi, P. Branchini, A. Budano, L. Caldeira Balkeståhl, G. Capon, F. Ceradini, P. Ciambrone, E. Czerwiński, E. Danè, E. De Lucia, G. De Robertis, A. De Santis, A. Di Domenico, C. Di Donato, R. Di Salvo, D. Domenici, O. Erriquez, G. Fanizzi, A. Fantini, G. Felici, S. Fiore, P. Franzini, P. Gauzzi, G. Giardina, S. Giovannella, F. Gonnella, E. Graziani, F. Happacher, L. Heijkenskjöld, B. Höistad, L. Iafolla, M. Jacewicz, T. Johansson, A. Kupsc, J. Lee-Franzini, B. Leverington, F. Loddo, S. Loffredo, M. Martemianov, M. Martini, M. Mascolo, R. Messi, S. Miscetti, G. Morello, D. Moricciani, P. Moskal, F. Nguyen, A. Passeri, V. Patera, I. Prado Longhi, A. Ranieri, C.F. Redmer, P. Santangelo, I. Sarra, M. Schioppa, B. Sciascia, M. Silarski, C. Taccini, L. Tortora, G. Venanzoni, W. Wiślicki, M. Wolke, and J. Zdebik

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Muon, Luminosity (scattering theory), Photon, Anomalous magnetic dipole moment, Hadron, Form factor (quantum field theory), Atomic and Molecular Physics, and Optics, Nuclear physics, Pion, High Energy Physics::Experiment, Anomaly (physics)
Abstract

The muon anomalous magnetic moment is one of the most precisely measured quantities in particle physics and a persistent discrepancy of about 3 σ between standard model (SM) prediction and the experimental measurement has been observed. The leading order contribution aμhlo is actually the main source of uncertainty in the theoretical evaluation of the muon anomaly. It is obtained by a dispersion integral using the precision measurement of hadronic cross section. The KLOE experiment at the DAΦNE ϕ−factory in Frascati was the first to exploit Initial State Radiation (ISR) processes to obtain the e+e−→π+π−(γ) cross section below 1 GeV, that accounts for most (70%) of the leading order contribution to the muon anomaly. In year 2005 and 2008 the KLOE-collaboration has published two measurements of the π+π− cross section with the photon in the initial state emitted at small angle, and an independent measurement with the photon emitted at large angle was finalized in year 2011. These measurements were normalized using luminosity from Bhabha. In the last years, a new analysis of KLOE data has been performed for obtaining the pion form factor directly from the bin-by-bin π+π−γ to μ+μ−γ ratio. We present the results of this new measurement, showing the comparison with our previous measurements, and its impact on the hadronic contribution to the muon anomaly.

Published
2014
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25. The characterization and application of a low resource FPGA-based time to digital converter

Author

M. Gatta, Paolo Ciambrone, M. Beretta, D. Moricciani, F. Gonnella, Alessandro Balla, R. Messi, L. Iafolla, Domenico Riondino, and M. Mascolo

Subjects
Physics, Nuclear and High Energy Physics, Interaction point, business.industry, Interface (computing), Converters, Data processing system, Time-to-digital converter, Data acquisition, business, Field-programmable gate array, Instrumentation, Computer hardware, Communication channel
Abstract

Time to Digital Converters (TDCs) are very common devices in particles physics experiments. A lot of “off-the-shelf” TDCs can be employed but the necessity of a custom DAta acQuisition (DAQ) system makes the TDCs implemented on the Field-Programmable Gate Arrays (FPGAs) desirable. Most of the architectures developed so far are based on the tapped delay lines with precision down to 10 ps, obtained with high FPGA resources usage and non-linearity issues to be managed. Often such precision is not necessary; in this case TDC architectures with low resources occupancy are preferable allowing the implementation of data processing systems and of other utilities on the same device. In order to reconstruct γγ physics events tagged with High Energy Tagger (HET) in the KLOE-2 (K LOng Experiment 2), we need to measure the Time Of Flight (TOF) of the electrons and positrons from the KLOE-2 Interaction Point (IP) to our tagging stations (11 m apart). The required resolution must be better than the bunch spacing (2.7 ns). We have developed and implemented on a Xilinx Virtex-5 FPGA a 32 channel TDC with a precision of 255 ps and low non-linearity effects along with an embedded data acquisition system and the interface to the online FARM of KLOE-2. The TDC is based on a low resources occupancy technique: the 4×Oversampling technique which, in this work, is pushed to its best resolution and its performances were exhaustively measured.

Published
2014
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26. Monte Carlo simulation of the LIDAL-ALTEA detector system

Author

C. Berucci, Livio Narici, R. Messi, C. La Tessa, M. C. Morone, F. Tommasino, M. Rovituso, Alessandro Rizzo, C. De Donato, G. Masciantonio, and L. Di Fino

Subjects
Physics, History, business.industry, Settore FIS/04, Settore FIS/07, Detector, Monte Carlo method, Measure (physics), Cosmic ray, Radiation, Particle identification, Computer Science Applications, Education, International Space Station, Calibration, Aerospace engineering, business
Abstract

The LIDAL (Light Ion Detector for ALTEA) is a device designed to work paired with three silicon detector units of ALTEA (Anomalous Long Term Effects on Astronauts) in order to improve the particle identification capabilities of ALTEA on the International Space Station also providing Time-of-Flight measurements. The LIDAL-ALTEA goal is to measure ions from protons up to iron in real time. The improved measurements of the radiation environment inside ISS will be very valuable for radiation risk assessment and mitigation. It is necessary to have a detailed simulation of the apparatus response to cosmic ray nuclei in order to assess the detector response, its observational capabilities and to set the relevant parameters of the device. Here a new Monte Carlo simulation of the LIDAL-ALTEA setup and physics processes, in the framework of FLUKA, is presented. A comparison between Monte Carlo simulations and calibration data is also shown.

Published
2019
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27. A new limit on the CP violating decay KS→3π0 with the KLOE experiment

Author

Paweł Moskal, M. Martemianov, C. F. Redmer, P. Franzini, J. Lee-Franzini, G. Fanizzi, G. Venanzoni, D. Moricciani, G. Capon, V. De Leo, E. De Lucia, I. Balwierz-Pytko, F. Nguyen, I. Prado Longhi, Cecilia Taccini, Magnus Wolke, B. Leverington, Lena Heijkenskjöld, C. Di Donato, K. Kacprzak, P. Gauzzi, F. Loddo, Giuseppe Mandaglio, S. Loffredo, L. Tortora, L. Iafolla, S. Fiore, A. De Santis, P. Ciambrone, Michał Silarski, Bo Höistad, O. Erriquez, Marek Jacewicz, A. Ranieri, P. Santangelo, Francesca Curciarello, Antonio Budano, G. Giardina, E. Graziani, A. Passeri, Vincenzo Patera, Andrzej Kupsc, Marco Schioppa, A. Di Domenico, Cesare Bini, A. Fantini, Jarosław Zdebik, Barbara Sciascia, M. Martini, S. Giovannella, Eryk Czerwiński, G. Bencivenni, S. Miscetti, D. Domenici, W. Wiślicki, F. Gonnella, D. Babusci, Gianfranco Morello, L. Caldeira Balkeståhl, I. Sarra, F. Bossi, E. Dané, R. Messi, T. Johansson, C. Bloise, M. Mascolo, R. Di Salvo, F. Happacher, P. Branchini, G. De Robertis, G. Felici, Davide Badoni, and F. Ceradini

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Photon, 010308 nuclear & particles physics, 01 natural sciences, Standard Model, Calorimeter, Nuclear physics, 0103 physical sciences, CP violation, Direct search, Limit (mathematics), 010306 general physics
Abstract

We have carried out a new direct search for the CP violating decay K-S -> 3 pi(0) with 1.7 fb(-1) of e(+)e(-) collisions collected by the KLOE detector at the Phi-factory DA Phi NE. We have searched for this decay in a sample of about 5.9 x 10(8) KSKL events tagging the K-S by means of the K-L interaction in the calorimeter and requiring six prompt photons. With respect to our previous search, the analysis has been improved by increasing of a factor four the tagged sample and by a more effective background rejection of fake K-S tags and spurious clusters. We find no candidates in data and simulated background samples, while we expect 0.12 standard model events. Normalizing to the number of K-S -> 2 pi(0) events in the same sample, we set the upper limit on BR(K-S -> 3 pi(0))

Published
2013
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28. Precision measurement of σ(e+e−→π+π−γ)/σ(e+e−→μ+μ−γ) and determination of the π+π− contribution to the muon anomaly with the KLOE detector

Author

A. Di Domenico, P. Lukin, S. Mueller, P. Gauzzi, A. De Santis, Marco Schioppa, F. Loddo, O. Erriquez, M. Wolke, W. Kluge, P. Ciambrone, E. Dané, F. Nguyen, D. Babusci, Francesca Curciarello, Barbara Sciascia, W. Wislicki, M. Martini, D. Domenici, G. Felici, F. Ceradini, A. Passeri, Vincenzo Patera, Li Caldeira Balkeståhl, Eryk Czerwiński, Andrzej Kupsc, D. Moricciani, Giuseppe Mandaglio, G. Fanizzi, P. Branchini, J. Zdebik, S. Miscetti, S. Giovannella, J. Lee-Franzini, I. Prado Longhi, R. Versaci, P. De Simone, G. Bencivenni, M. Mascolo, I. Sarra, Cecilia Taccini, V. De Leo, G. Giardina, E. De Lucia, F. Bossi, I. Balwierz-Pytko, Davide Badoni, G. De Robertis, P. Franzini, L. Iafolla, G. Venanzoni, S. Fiore, Tord Johansson, Bo Höistad, L. Tortora, Lena Heijkenskjöld, E. Graziani, Marek Jacewicz, Antonio Budano, A. Ranieri, C. F. Redmer, E. Iarocci, Cesare Bini, F. Happacher, Gianfranco Morello, F. Gonnella, C. Bloise, G. Capon, P. Santangelo, R. Messi, C. Di Donato, Paweł Moskal, M. Martemianov, and Michał Silarski

Subjects
Physics, Nuclear and High Energy Physics, Muon, Meson, 010308 nuclear & particles physics, Electron–positron annihilation, Hadron, Form factor (quantum field theory), 01 natural sciences, Nuclear physics, Pion, 0103 physical sciences, High Energy Physics::Experiment, 010306 general physics, Lepton, Dimensionless quantity
Abstract

We have measured the ratio cr (e(+)e(-) -> pi(+)pi(-)gamma)/sigma(e(+)e(-) -> mu(+)mu(-)gamma), with the KLOE detector at DA Phi NE for a total integrated luminosity of similar to 240 pb(-1). From this ratio we obtain the cross section sigma (e(+)e(-) -> pi(+)pi(-)gamma). From the cross section we determine the pion form factor vertical bar F-pi vertical bar(2) and the two-pion contribution to the muon anomaly a(mu) for 0.592< M-pi pi < 0.975 GeV, Delta(pi pi) a(mu) = (385.1 +/- 1.1(stat) +/- 2.7(sys+theo)) x 10(-10). This result confirms the current discrepancy between the Standard Model calculation and the experimental measurement of the muon anomaly. (c) 2013 Elsevier B.V. All rights reserved.

Published
2013
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29. Measurement of Γ(η→π+π−γ)/Γ(η→π+π−π0) with the KLOE detector

Author

D. Babusci, D. Badoni, I. Balwierz-Pytko, G. Bencivenni, C. Bini, C. Bloise, V. Bocci, F. Bossi, P. Branchini, A. Budano, L. Caldeira Balkeståhl, G. Capon, F. Ceradini, P. Ciambrone, E. Czerwiński, E. Dané, E. De Lucia, G. De Robertis, A. De Santis, P. De Simone, A. Di Domenico, C. Di Donato, B. Di Micco, R. Di Salvo, D. Domenici, O. Erriquez, G. Fanizzi, A. Fantini, G. Felici, S. Fiore, P. Franzini, P. Gauzzi, G. Giardina, S. Giovannella, F. Gonnella, E. Graziani, F. Happacher, B. Höistad, L. Iafolla, M. Jacewicz, T. Johansson, A. Kupsc, J. Lee-Franzini, B. Leverington, F. Loddo, S. Loffredo, G. Mandaglio, M. Martemianov, M. Martini, M. Mascolo, R. Messi, S. Miscetti, G. Morello, D. Moricciani, P. Moskal, F. Nguyen, A. Passeri, V. Patera, I. Prado Longhi, A. Ranieri, C.F. Redmer, P. Santangelo, I. Sarra, M. Schioppa, B. Sciascia, M. Silarski, C. Taccini, L. Tortora, G. Venanzoni, R. Versaci, W. Wiślicki, M. Wolke, G. Xu, and J. Zdebik

Subjects
Physics, Nuclear and High Energy Physics, Chiral perturbation theory, 010308 nuclear & particles physics, Gamma ray, Analytical chemistry, 01 natural sciences, Gamma gamma, Luminosity, 0103 physical sciences, Pi, High Energy Physics::Experiment, Invariant mass, Nuclear Experiment, 010306 general physics
Abstract

The ratio R-eta = Gamma(eta -> pi(+)pi(-)gamma)/Gamma(eta -> pi(+)pi(-)pi(0)) has been measured by analysing 22 million phi -> eta gamma decays collected by the KLOE experiment at DANE, corresponding to an integrated luminosity of 558 pb(-1). The eta -> pi(+)pi(-)gamma proceeds both via the rho resonant contribution, and possibly a non-resonant direct term, connected to the box anomaly. Our result, R-eta = 0.1856 +/- 0.0005(stat)+/- 0.0028(syst), points out a sizable contribution of the direct term to the total width. The di-pion invariant mass for the eta -> pi(+)pi(-)gamma decay could be described in a model-independent approach in terms of a(-) single free parameter, alpha. The determined value of the parameter alpha is alpha = (1.32 +/- 0.08(stat-0.09syst)(+0.10) +/- 0.02(theo)) GeV-2. 2012 Elsevier B.V. All rights reserved.

Published
2013
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30. Polarised Photon Beams for the BGO-OD Experiment at ELSA

Author

P. Levi Sandri, S. Friedrich, B.-E. Reitz, V. Ganenko, D. Elsner, Francesco Messi, R. Jahn, T. C. Jude, F. Ghio, K.-T. Brinkmann, V. G. Nedorezov, D. P. Watts, M. Becker, D. Moricciani, A. Bella, D. Walther, P. Pedroni, V. Vegna, R. Joosten, A. M. Lapik, H. Schmieden, D. E. Bayadilov, P. Bielefeldt, A. B. Gridnev, Mariana Nanova, S. Boese, T. Zimmermann, A. Stugelev, V. De Leo, E. Gutz, V. Metag, Wolfgang Hillert, S. Alef, P. Hartmann, B. Krusche, Giuseppe Mandaglio, G. Gervino, T. Rostomyan, M. Romaniuk, A. Braghieri, G. Scheluchin, G. Giardina, J. Hannappel, I. V. Lopatin, H. Dutz, A. Fantini, V. Tarakanov, P. L. Cole, N. V. Rudnev, Reinhard Beck, O. Freyermuth, Hans-Georg Zaunick, V. V. Sumachev, A. Ignatov, C. Schaerf, D. Hammann, Francesca Curciarello, K. Koop, R. Messi, Frank Frommberger, A. N. Mushkarenkov, D. Novinskiy, S. Goertz, Frank Klein, and R. Di Salvo

Subjects
Physics, Nuclear physics, Elastic scattering, law, Bremsstrahlung, Polarimeter, Particle accelerator, Electron, Nuclear Experiment, Polarization (waves), Nucleon, Electromagnetic radiation, law.invention
Abstract

The new BGO-OD experiment at the electron accelerator ELSA, of the University of Bonn, is designed to study the reaction dynamics of nucleon excitations in meson photoproduction. It consists of a central BGO calorimeter with a magnetic spectrometer in forward direction. The physics programme includes the measurement of polarisation observables using linearly and circularly polarised photon beams. Linear polarisation is obtained by coherent bremsstrahlung off a diamond crystal, and circular polarisation is obtained via bremsstrahlung from longitudinally polarised electrons. The degree of linear polarisation is determined from the bremsstrahlung spectrum itself. To determine the polarisation of the circularly polarised photon beam, the polarisation of the electron beam is measured by a Moller polarimeter. As a preliminary consistency check, the (linear) polarisation observable, Σ, was compared to world data for π^0 and η photoproduction. To determine the degree of circular polarisation, a Moller polarimeter was setup and first measurements of the electron beam polarisation performed.

Published
2016
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31. Commissioning and initial experimental program of the BGO-OD experiment at ELSA

Author

D. Elsner, K. Koop, V. G. Nedorezov, D. Geffers, Wolfgang Hillert, R. Jahn, H. Dutz, H. Schmieden, D. Moricciani, D. E. Bayadilov, R. Messi, T. C. Jude, G. Scheluchin, Friedrich Klein, T. Rostomyan, A. B. Gridnev, A. Ignatov, Mariana Nanova, M. Becker, S. Böse, V. Tarakanov, G. Gervino, P. Levi Sandri, D. Walther, J. Knaust, D. P. Watts, E. Gutz, P. Bielefeldt, Reinhard Beck, S. Friedrich, A. Braghieri, A. M. Lapik, N. Rudnev, Francesco Messi, B.-E. Reitz, A. Stugelev, V. Ganenko, S. Görtz, Hans-Georg Zaunick, Patrick Bauer, F. Ghio, V. V. Sumachev, C. Schaerf, I. V. Lopatin, D. Hammann, Volker Metag, K.-T. Brinkmann, S. Alef, T. Zimmermann, V. Vegna, P. Cole, R. Joosten, P. Pedroni, K. Kohl, A. Fantini, B. Krusche, Giuseppe Mandaglio, M. Romaniuk, O. Freyermuth, A. Bella, J. Hannappel, D. Novinskiy, A. Mushkarenkov, R. Di Salvo, and Frank Frommberger

Subjects
Photon, Meson, QC1-999, Hadron, Nuclear Theory, Elementary particle, Astrophysics, radiation detection, 01 natural sciences, Particle detector, Nuclear physics, Hadron Physics, 0103 physical sciences, Nuclear Physics, Hadron Physics, radiation detection, 010306 general physics, Nuclear Experiment, Nuclear Physics, Physics, 010308 nuclear & particles physics, Settore FIS/04, Detector, High Energy Physics::Phenomenology, Hyperon, Baryon, High Energy Physics::Experiment
Abstract

BGO-OD is a new meson photoproduction experiment at the ELSA facility of Bonn University. It aims at the investigation of non strange and strange baryon excitations, and is especially designed to be able to detect weekly bound meson-baryon type structures. The setup for the BGO-OD experiment is presented, the characteristics of the photon beam and the detector performances are shown and the initial experimental program is discussed.

Published
2016

32. Measurement of the ϕ→π0e+e− transition form factor with the KLOE detector

Author

M. Berlowski, G. D'Agostini, E. Dané, A. D'Uffizi, Paolo Santangelo, G. Giardina, G. Felici, Wojciech Krzemien, Eryk Czerwiński, A. Passeri, L. Caldeira Balkeståhl, I. Sarra, F. Sirghi, P. Branchini, S. Loffredo, A. Fantini, A. Anastasi, Lena Heijkenskjöld, D. Moricciani, Antonio Budano, Filippo Ceradini, A. Di Cicco, L. Tortora, F. Happacher, Aleksander Gajos, W. Ikegami Andersson, S. Giovannella, Vincenzo Patera, R. Messi, T. Johansson, Daria Kamińska, Andrzej Kupsc, M. Papenbrock, V. De Leo, F. Bossi, E. De Lucia, Paolo Ciambrone, D. Domenici, R. Di Salvo, G. Venanzoni, Giuseppe Mandaglio, F. Curciarello, Wojciech Wiślicki, B. Cao, S. Fiore, E. Perez del Rio, E. Graziani, G. Bencivenni, Magnus Wolke, P. Gauzzi, Piotr Salabura, S. Miscetti, A. De Santis, P. De Simone, M. Mascolo, A. Di Domenico, Michał Silarski, Paweł Moskal, Gianfranco Morello, D. Babusci, Marco Schioppa, C. Bloise, A. Ranieri, M. Martini, Anastasi, A., Ceradini, Filippo, DI CICCO, Alessandro, Loffredo, Salvatore, and Fiore, S.

Subjects
Nuclear and High Energy Physics, Electron–positron annihilation, e+e− collisions, Transition form factor, 01 natural sciences, Conversion decay, E+e- collisions, High Energy Physics - Experiment, law.invention, Nuclear physics, Subatomär fysik, e(+)e(-) collisions, law, 0103 physical sciences, Subatomic Physics, 010306 general physics, Collider, E+e- collision, Settore FIS/01, Physics, 010308 nuclear & particles physics, Branching fraction, Detector, Form factor (quantum field theory), Pseudoscalar, High Energy Physics - Phenomenology, Transition form factors, electron positron collider, KLOE experiment, High Energy Physics::Experiment
Abstract

A measurement of the vector to pseudoscalar conversion decay $\phi \to \pi^0 e^+e^-$ with the KLOE experiment is presented. A sample of $\sim 9500$ signal events was selected from a data set of 1.7 fb$^{-1}$ of $e^+e^-$ collisions at $\sqrt{s} \sim m_{\phi}$ collected at the DA$\Phi$NE $e^+e^-$ collider. These events were used to obtain the first measurement of the transition form factor $| F_{\phi \pi^0}(q^2) |$ and a new measurement of the branching ratio of the decay: $\rm{BR}\,(\phi \to \pi^0 e^+e^-) = (\,1.35 \pm 0.05^{\,\,+0.05}_{\,\,-0.10}\,) \times 10 ^{-5}$. The result improves significantly on previous measurements and is in agreement with theoretical predictions., Comment: 13 pages, 4 figures; matches published version

Published
2016

33. Strangeness Photoproduction at the BGO-OD Experiment

Author

V. G. Nedorezov, Frank Frommberger, V. Metag, A. Ignatov, Hans-Georg Zaunick, V. Tarakanov, T. Zimmermann, N. V. Rudnev, D. Hammann, D. Moricciani, P. Bielefeldt, Wolfgang Hillert, P. Pedroni, A. N. Mushkarenkov, D. P. Watts, V. Vegna, O. Freyermuth, D. Novinskiy, D. Elsner, Francesca Curciarello, S. Goertz, V. De Leo, B. Krusche, Giuseppe Mandaglio, R. Messi, M. Romaniuk, H. Dutz, A. Braghieri, B.-E. Reitz, P. Levi Sandri, A. Bella, V. Ganenko, Reinhard Beck, P. Hartmann, Frank Klein, R. Di Salvo, T. Rostomyan, G. Scheluchin, E. Gutz, A. Fantini, D. Walther, S. Friedrich, F. Ghio, Francesco Messi, V. V. Sumachev, S. Boese, P. L. Cole, R. Joosten, S. Alef, G. Giardina, R. Jahn, K. Koop, J. Hannappel, T. C. Jude, M. Becker, I. V. Lopatin, A. Stugelev, K.-T. Brinkmann, A. M. Lapik, G. Gervino, H. Schmieden, D. E. Bayadilov, A. B. Gridnev, and Mariana Nanova

Subjects
Meson, Nuclear Theory, FOS: Physical sciences, Electron, Strangeness, Tracking (particle physics), nucl-ex, 01 natural sciences, Nuclear physics, photoproduction, dynamically generated resonance, strangeness, BGO-OD, 0103 physical sciences, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Physics, Settore FIS/01, Calorimeter (particle physics), Spectrometer, 010308 nuclear & particles physics, photoproduction, dynamically generated resonance, strangeness, BGO-OD, High Energy Physics::Experiment, Nucleon, Beam (structure)
Abstract

BGO-OD is a newly commissioned experiment to investigate the internal structure of the nucleon, using an energy tagged bremsstrahlung photon beam at the ELSA electron facility. The setup consists of a highly segmented BGO calorimeter surrounding the target, with a particle tracking magnetic spectrometer at forward angles. BGO-OD is ideal for investigating meson photoproduction. The extensive physics programme for open strangeness photoproduction is introduced, and preliminary analysis presented., 6 pages, 4 figures. Proceedings for the 10th International Workshop on the Physics of Excited Nucleons (NSTAR2015)

Published
2016
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34. Limit on the production of a new vector boson in e+e-→Uγ, U→π+π- with the KLOE experiment

Author

A. D'Uffizi, Aleksander Gajos, Eryk Czerwiński, L. Caldeira Balkeståhl, I. Sarra, A. De Santis, G. D'Agostini, E. Dané, B. Cao, A. Di Cicco, Wojciech Krzemien, V. De Leo, Filippo Ceradini, S. Loffredo, G. Venanzoni, M. Papenbrock, F. Bossi, D. Moricciani, F. Sirghi, D. Babusci, P. Branchini, G. Felici, F. Curciarello, C. Bloise, Paolo Ciambrone, M. Berlowski, R. Di Salvo, S. Fiore, A. Ranieri, E. Graziani, A. Fantini, S. Giovannella, S. Miscetti, L. Tortora, G. Giardina, Lena Heijkenskjöld, Paweł Moskal, Antonio Budano, M. Martini, A. Di Domenico, Michał Silarski, A. Passeri, Daria Kamińska, P. De Simone, D. Domenici, Wojciech Wiślicki, Gianfranco Morello, M. Mascolo, Magnus Wolke, P. Gauzzi, E. Perez del Rio, Marco Schioppa, F. Happacher, W. Ikegami Andersson, Vincenzo Patera, Andrzej Kupsc, E. De Lucia, Giuseppe Mandaglio, Paolo Santangelo, R. Messi, T. Johansson, A. Palladino, G. Bencivenni, A. Anastasi, Fiore, S., Anastasi, A., Ceradini, Filippo, DI CICCO, Alessandro, and Loffredo, Salvatore

Subjects
Particle physics, Nuclear and High Energy Physics, Dark forces, Photon, Electron–positron annihilation, Dark matter, U boson, Radiation, 01 natural sciences, Dark photon, Vector boson, Nuclear physics, Subatomär fysik, 0103 physical sciences, Subatomic Physics, 010306 general physics, Physics, Gauge boson, 010308 nuclear & particles physics, Branching fraction, Settore FIS/01 - Fisica Sperimentale, Dark force
Abstract

The recent interest in a light gauge boson in the framework of an extra U(1) symmetry motivates searches in the mass range below 1 GeV. We present a search for such a particle, the dark photon, in e + e − → U γ , U → π + π − based on 28 million e + e − → π + π − γ events collected at DAΦNE by the KLOE experiment. The π + π − production by initial-state radiation compensates for a loss of sensitivity of previous KLOE U → e + e − , μ + μ − searches due to the small branching ratios in the ρ – ω resonance region. We found no evidence for a signal and set a limit at 90% CL on the mixing strength between the photon and the dark photon, e 2 , in the U mass range between 527 and 987 MeV . Above 700 MeV this new limit is more stringent than previous ones.

Published
2016

35. Precision measurement of the η → π +π −π 0Dalitz plot distribution with the KLOE detector

Author

M. Papenbrock, F. Bossi, E. Perez del Rio, P. De Simone, A. Fantini, S. Loffredo, A. Di Cicco, Gianfranco Morello, C. Bloise, Lena Heijkenskjöld, R. Messi, S. Miscetti, T. Johansson, Paolo Santangelo, Filippo Ceradini, Marco Schioppa, A. Di Domenico, Antonio Budano, G. Venanzoni, A. De Santis, A. D'Uffizi, Aleksander Gajos, V. De Leo, Paweł Moskal, B. Cao, F. Curciarello, Michał Silarski, Eryk Czerwiński, D. Moricciani, Daria Kamińska, G. Bencivenni, L. Caldeira Balkeståhl, I. Sarra, E. De Lucia, Paolo Ciambrone, D. Domenici, M. Berlowski, W. Wislicki, Giuseppe Mandaglio, S. Fiore, A. Ranieri, M. Mascolo, E. Graziani, G. Giardina, M. Martini, L. Tortora, D. Babusci, F. Happacher, W. Ikegami Andersson, R. Di Salvo, S. Giovannella, A. Anastasi, Wojciech Krzemien, F. Sirghi, P. Branchini, G. Felici, G. D'Agostini, E. Dané, A. Passeri, Vincenzo Patera, Andrzej Kupsc, Magnus Wolke, P. Gauzzi, Fiore, S, Anastasi, A., Ceradini, Filippo, DI CICCO, Alessandro, and Loffredo, Salvatore

Subjects
e+-e- Experiment, Nuclear and High Energy Physics, Particle physics, Electron–positron annihilation, Dalitz plot, Electron positron collider, e plus -e- Experiments, QCD, 01 natural sciences, e plus -e- Experiments, QCD, Subatomär fysik, Nuclear physics, Subatomic Physics, 0103 physical sciences, Eta meson, 010306 general physics, Polynomial expansion, Settore FIS/01, Physics, Quantum chromodynamics, e+-e- Experiments, 010308 nuclear & particles physics, Detector, Charge (physics), 16. Peace & justice, Distribution (mathematics), Eta meson, Electron positron collider, KLOE experiment, KLOE experiment, Dimensionless quantity
Abstract

Using 1.6 fb−1 of e + e − → ϕ → ηγ data collected with the KLOE detector at DAΦNE, the Dalitz plot distribution for the η → π + π − π 0 decay is studied with the world’s largest sample of ∼ 4.7 · 106 events. The Dalitz plot density is parametrized as a polynomial expansion up to cubic terms in the normalized dimensionless variables X and Y . The experiment is sensitive to all charge conjugation conserving terms of the expansion, including a gX 2 Y term. The statistical uncertainty of all parameters is improved by a factor two with respect to earlier measurements.

Published
2016

36. Measurement of the cross-section ratio σ(χc2)/σ(χc1) for prompt χc production at s=7 TeV

Author

G. Passaleva, K. Wyllie, B. Pietrzyk, Marie Nicol, R. Lindner, F. Xing, J. Luisier, I. Nasteva, C. Bauer, E. Lanciotti, Tara Shears, Anton Poluektov, P. Hunt, E. Greening, P. Collins, M. Merk, N. Torr, Alexander Leflat, Audrey Jaeger, Patrick Koppenburg, S. Kandybei, C. Salzmann, Yuehong Xie, M. Perrin-Terrin, Lei Zhang, V. Niess, E. Grauges, O. Leroy, Agnieszka Oblakowska-Mucha, Jonas Rademacker, Stephen M. Stahl, R. M. D. Mamunur, E. Thomas, H. Lu, C. Färber, B. Muryn, F. Domingo Bonal, L. Kravchuk, G. D. Patel, D. Savrina, L. Arrabito, Alessandro Cardini, J. M. De Miranda, M. Knecht, Dmitry Golubkov, R. Messi, D. Galli, Sandro Cadeddu, V. Vagnoni, A. Dziurda, R. Graciani Diaz, Neville Harnew, Carmelo D'Ambrosio, C. Pavel-Nicorescu, Patrick Robbe, F. Machefert, J. Harrison, A. Pazos Alvarez, Mark Whitehead, Alessio Sarti, M. Rosello, N. Neufeld, C. J. Parkinson, A. Petrella, G. Wilkinson, L. Martin, S. K. Paterson, S. Perazzini, J. Molina Rodriguez, Zhenwei Yang, S. Vecchi, P. Naik, T. M. Karbach, Silvia Borghi, P. Spradlin, L. Del Buono, E. Teodorescu, S. Stoica, C. Parkes, V. Bocci, Ross D. Young, Paolo Gandini, J. Merkel, Pavel Krokovny, M. Karacson, A. Semennikov, D. Brett, M. Britsch, V. Shevchenko, W. Witzeling, Yasmine Amhis, G. McGregor, G. Manca, O. Schneider, J. Prisciandaro, R. Muresan, V. Balagura, Andrei Nomerotski, C. Santamarina Rios, C. Farinelli, E. Hicks, T. Hampson, Z. Xing, Yu. Guz, J. Benton, P. Sail, A. Phan, M. Nedos, A. Vollhardt, P. Urquijo, Michael Alexander, P. De Simone, Li Li, Manuel Schiller, S. Swientek, C. Patrignani, V. Tisserand, G. Martellotti, O. Maev, Denis Derkach, M. Szczekowski, D. Pinci, V. Egorychev, H. Degaudenzi, Karol Hennessy, M. Charles, B. B. Shao, C. Lazzeroni, M. Meissner, A. Cook, S. Oggero, S. Playfer, M. Kaballo, F. De Lorenzi, A. Pérez-Calero Yzquierdo, S. Farry, Gianluigi Casse, B. Spaan, M. Schmelling, Marwa Jahjah-Hussein, I. R. Kenyon, A. Bay, S.I. Eidelman, J. Closier, M. H. Schune, U. Uwer, R. Santacesaria, Yejin Zhang, Stephane Monteil, M. Pappagallo, Tomasz Skwarnicki, Sebastian Bachmann, A. Solomin, W. C. Zhang, F. Fontanelli, F. Ferreira Rodrigues, M. Tobin, A. Massafferri, S. Belogurov, L. Carson, J. A. Hernando Morata, S. Gregson, E. Jans, W. D. Hulsbergen, B. Pie Valls, I. Videau, M. Deissenroth, A. Powell, A. Büchler-Germann, A. Tsaregorodtsev, M. S. Rangel, V. Obraztsov, Pierre Henrard, F. Soomro, S. Ricciardi, S. Redford, Fan Zhang, B. Rakotomiaramanana, J. Magnin, Stephan Eisenhardt, Roel Aaij, R. Vazquez Gomez, C. Göbel, Yongsun Kim, Nicola Serra, K. Carvalho Akiba, T. du Pree, D. S. Bailey, Christoph Frei, O. Callot, Krzysztof Grzegorz Sobczak, G. Pessina, S. Benson, Marianna Fontana, N. Lopez-March, C. Barschel, D. Moran, U. Kerzel, L. Garrido, J. H. Lopes, J. van Leerdam, G. Raven, D. Decamp, A. Golutvin, V. Romanovsky, C. Bozzi, K. Senderowska, J. van Tilburg, Philip Ilten, M. Frosini, A. Papanestis, K. Ciba, E. Fanchini, O. Aquines Gutierrez, Sergey Barsuk, U. Marconi, G. N. Patrick, Th. Bauer, N. Gauvin, S. De Capua, Robert Appleby, I. Shapoval, F. Maciuc, A. Petrolini, J. Rouvinet, R. McNulty, F. Constantin, G. Fardell, Nikolay Nikitin, T. E. Latham, Z. Mathe, S. Blusk, R. Harji, A. Grecu, M. Pepe Altarelli, Stephane T'Jampens, D. Martinez Santos, Mikhail Zavertyaev, C. Langenbruch, H. Ruiz, M. Orlandea, Themistocles Bowcock, B. Storaci, Alessandro Camboni, W. Qian, J. J. Back, Marco Gersabeck, N. Tuning, M. M. Reid, A. Kozlinskiy, A. Dovbnya, N. Chiapolini, I. Sepp, Christine Mclean, V. Gibson, Bernardo Adeva, E. Lopez Asamar, C. Thomas, D. Lambert, G. Mancinelli, Conor Fitzpatrick, J. P. Lees, E. S. Smith, A.E. Bondar, R. W. Lambert, E. Tournefier, Roberta Cardinale, B. Schmidt, Francesco Dettori, M. Seco, P. M. Bjørnstad, A. Martín Sánchez, D. Volyanskyy, Ch. Cauet, G. J. Rogers, M. Schlupp, J. F. J. van den Brand, A. Bobrov, Mario Sannino, Ph. Charpentier, P. E. L. Clarke, P. Jaton, Giovanni Carboni, D. Websdale, J. M. Otalora Goicochea, A. Falabella, Biagio Saitta, C. Haen, Thomas Blake, J. Bressieux, K. Kruzelecki, K. Müller, Kurt Rinnert, T. Ruf, A. Novoselov, Simone Bifani, A. Mac Raighne, Markus Frank, Barbara Sciascia, J. Visniakov, P. David, M. Ubeda Garcia, I. De Bonis, M. De Cian, V. N. La Thi, D. Hynds, R. J. Barlow, C. Nguyen-Mau, I. V. Machikhiliyan, K. Kreplin, T. Pilař, Marina Artuso, M. Liles, G. Lanfranchi, M.-N. Minard, J. Mylroie-Smith, S. Filippov, A. Bates, G. D. Lafferty, F. Dupertuis, Sheldon Stone, P. Alvarez Cartelle, A. Zvyagin, P. Szczypka, M. Musy, Diego Alejandro Roa Romero, C. Adrover, Emilie Maurice, K. Holubyev, M. van Beuzekom, T. Huse, P. Schaack, N. A. Smith, E. van Herwijnen, J. Blouw, A. Vorobyev, F. Dordei, Sandra Amato, B. Jean-Marie, A. C. dos Reis, Marta Calvi, J. He, K. Belous, F. Blanc, T. Britton, H. V. Cliff, M. Ferro-Luzzi, Federico Alessio, Andrea Bizzeti, S. Miglioranzi, R. Ekelhof, S. Easo, V. K. Subbiah, R. Lefèvre, S. Ogilvy, B. Gui, F. Teubert, F. Jansen, C. Potterat, B. D'Almagne, N. Mangiafave, A. C. Smith, G. Alkhazov, A. Borgia, C. Deplano, P. Diniz Batista, J. Lefrançois, G. Graziani, Bo Liu, C. Linn, B. Maynard, G. Polok, R. Märki, P. N. Y. David, G. Valenti, Ch. Elsasser, David Gascon, J. Serrano, C. Abellan Beteta, I. Mous, A. Ukleja, B. Khanji, P. Vazquez Regueiro, R. Silva Coutinho, Dmitry Popov, Antonio Pellegrino, Ivan Belyaev, M. T. Tran, B. Souza De Paula, M. Matveev, E. Polycarpo, Tatsuya Nakada, Marco Cattaneo, Paul Fraser Harrison, C. Blanks, J. Dickens, O. Shevchenko, P. Owen, W. Baldini, G. Bencivenni, M. Calvo Gomez, M. Shapkin, M. Palutan, A. Artamonov, Guoming Liu, Y. Shcheglov, L. Wiggers, F. F. Wilson, F. J. P. Soler, I. Burducea, Yang Gao, T. Kvaratskheliya, G. Corti, T. J. Gershon, M. O. Bettler, V. V. Gligorov, A. Palano, Tomasz Szumlak, R. Plackett, A. Puig Navarro, R. Schwemmer, A. Gomes, Elie Aslanides, L. A. Granado Cardoso, B. Muster, Howard Gordon, F. Eisele, Gianni Penso, J. G. Cogan, S. C. Haines, J. Wishahi, G. Ciezarek, H. Brown, J. Imong, N. H. Brook, R. Jacobsson, S. Schleich, David Hutchcroft, Lars Eklund, Ziad Ajaltouni, D. L. Perego, D. R. Johnson, K. Pal, M. Patel, F. F. Jing, D. Lacarrere, M. Lieng, P. Morawski, W. Bonivento, N. K. Watson, P. Seyfert, C. R. Jones, D. Esperante Pereira, E. Ben-Haim, D. Elsby, L. Zhong, B. Viaud, N. Sagidova, V. Fernandez Albor, X. Cid Vidal, F. Muheim, H. Voss, E. Perez Trigo, C. Matteuzzi, U. Straumann, M. Veltri, G. Haefeli, Olivier Deschamps, Flavio Archilli, F. Kruse, Tjeerd Ketel, Roland Bernet, Valery Pugatch, R. Nandakumar, Pavel Shatalov, A. Satta, E. Picatoste Olloqui, D. Dossett, S. Wandernoth, M. Savrie, V. Heijne, J. Garra Tico, J. Keaveney, S. Topp-Joergensen, Ulrik Egede, A. Martens, Xavier Vilasis-Cardona, Marc S. Williams, M. Kucharczyk, D. A. Milanes, T. Gys, A. Zhelezov, C. Satriano, J-C. Garnier, M. Deckenhoff, D. van Eijk, L. Esteve, G. Auriemma, A. Contu, E. G. Zverev, J. J. Saborido Silva, O. Yushchenko, P. Rodriguez Perez, A. Bien, A. A. Alves, E. Rodrigues, T. Brambach, J. Palacios, R. Dzhelyadin, A. Lai, L. De Paula, L. Li Gioi, D. Voong, R. Le Gac, M. Witek, M. Needham, Johannes Albrecht, Malcolm John, M. Gandelman, R. Santinelli, V. Fave, E. Gushchin, D. Wiedner, A. D. Webber, Nikolay Bondar, O. Okhrimenko, Ph. Ghez, A. Sciubba, J. Marks, M. Straticiuc, G. A. Cowan, G. Krocker, L. Shekhtman, A. Dosil Suárez, Victor Coco, D. R. Ward, A. A. Affolder, J. Anderson, M. Grabalosa Gándara, Hans Dijkstra, C. Gaspar, Jing Wang, A. Mazurov, T. Bird, J. Panman, A. Comerma-Montells, Michal Kreps, B. Jost, C. Coca, M. Benayoun, V. Iakovenko, S. Donleavy, Marco Clemencic, Pascal Perret, Roger Forty, A. Keune, E. Santovetti, Albert Bursche, S. Roiser, G. Sabatino, A. Shires, F. Stagni, R. S. Huston, G. Conti, R. Currie, M. P. Williams, S. Hansmann-Menzemer, A. Schopper, R. Mountain, T. Lesiak, Jan Buytaert, M. Plo Casasus, William Barter, Angelo Carbone, Jaap Velthuis, M. Sapunov, S. Malde, M. Coombes, S. Furcas, B. Popovici, Ignacio Bediaga, Plamen Hristov Hopchev, I. Raniuk, Pierluigi Campana, S. A. Wotton, Rudolf Oldeman, A. Gallas Torreira, Marco Adinolfi, A. Sparkes, O. Steinkamp, and J. Garofoli

Subjects
Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Particle physics, Meson, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Sigma, Order (ring theory), Quarkonium, 01 natural sciences, Quantum mechanics, 0103 physical sciences, Transverse momentum, High Energy Physics::Experiment, Production (computer science), Nuclear Experiment, 010306 general physics, Energy (signal processing)
Abstract

The prompt production of the charmonium $\chi_{c1}$ and $\chi_{c2}$ mesons has been studied in proton-proton collisions at the Large Hadron Collider at a centre-of-mass energy of $\sqrt{s}=7$ TeV. The $\chi_c$ mesons are identified through their decays $\chi_c\to J/\psi\,\gamma$ with $J/\psi \to \mu^+ \mu^-$ using 36 $\mathrm{pb^{-1}}$ of data collected by the LHCb detector in 2010. The ratio of the prompt production cross-sections for the two $\chi_c$ spin states, $\sigma(\chi_{c2})/\sigma(\chi_{c1})$, has been determined as a function of the $J/\psi$ transverse momentum, $p_{\mathrm{T}}^{J/\psi}$, in the range from 2 to 15 GeV/$c$. The results are in agreement with the next-to-leading order non-relativistic QCD model at high $p_{\mathrm{T}}^{J/\psi}$ and lie consistently above the pure leading-order colour singlet prediction.

Published
2012
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37. Measurement of the Bs0–B¯s0 oscillation frequency Δms in Bs0→Ds−(3)π decays

Author

A. C. Smith, N. Chiapolini, I. Sepp, William Barter, S. Easo, Angelo Carbone, Jaap Velthuis, A. Borgia, Francesco Dettori, B. Souza De Paula, F. J. P. Soler, H. Degaudenzi, Tara Shears, M. Sapunov, A. Mazurov, U. Kerzel, T. E. Latham, Z. Mathe, Christine Mclean, C. Thomas, D. Lambert, J. F. J. van den Brand, S. Kukulak, G. Valenti, Simone Bifani, Anton Poluektov, Illya Shapoval, Pascal Perret, A. Falabella, S. Vecchi, L. Garrido, Biagio Saitta, S. C. Haines, K. Mueller, D. Lacarrere, M. Lieng, Yu. Guz, C. Matteuzzi, S. Malde, F. Jansen, M. Jahjah Hussein, C. Deplano, C. Goebel, I. V. Machikhiliyan, Alexander Leflat, S. Filippov, Patrick Koppenburg, J. Magnin, Yasmine Amhis, S.I. Eidelman, Lei Zhang, G. Krocker, S. Ricciardi, O. Shevchenko, P. Owen, S. Redford, Christoph Frei, J. Visniakov, I. De Bonis, W. Witzeling, G. D. Patel, K. Wacker, Roland Bernet, T. Pilar, S. Wandernoth, M. Coombes, C. Faerber, D. Voong, R. Le Gac, G. Polok, M. H. Schune, U. Uwer, Sandro Cadeddu, M. Ferro-Luzzi, L. Shekhtman, A. Dosil Suárez, Agnieszka Oblakowska-Mucha, C. Pavel-Nicorescu, R. M. D. Mamunur, B. Spaan, Roger Forty, I. Mous, Alessio Sarti, K. Wyllie, B. Pietrzyk, S. Furcas, R. Maerki, B. Popovici, E. Lopez Asamar, F. Kruse, J. Closier, A. Massafferri, J. A. Hernando Morata, A. Papanestis, C. J. Parkinson, A. Grecu, R. Schwemmer, J. Imong, A. Keune, E. Santovetti, J. J. Back, Bernardo Adeva, Albert Bursche, C. Langenbruch, Ignacio Bediaga, B. Storaci, M. Needham, G. Martellotti, A. Solomin, T. du Pree, Silvia Borghi, Victor Coco, K. Vervink, L. Del Buono, S. K. Paterson, A. Ukleja, P. David, S. Roiser, G. Sabatino, F. Dupertuis, A.E. Bondar, P. Alvarez Cartelle, E. Hicks, Roel Aaij, Pavel Shatalov, Antonio Pellegrino, D. G. d'Enterria, A. Shires, W. C. Zhang, A. Semennikov, D. Brett, M. Pepe Altarelli, Pavel Krokovny, M. Karacson, O. Maev, M. Merk, Pierre Henrard, W. D. Hulsbergen, G. Mancinelli, Conor Fitzpatrick, A. Satta, Marco Gersabeck, Sandra Amato, K. Belous, J. H. Lopes, M. Nedos, A. Vollhardt, Ulrik Egede, X. Cid Vidal, F. Muheim, Tomasz Skwarnicki, S. Blusk, E. Polycarpo, Tatsuya Nakada, Sebastian Bachmann, G. Bencivenni, F. Stagni, R. S. Huston, J. M. Caicedo Carvajal, T. Hampson, M. Britsch, B. Pie Valls, P. M. Bjørnstad, G. Conti, Timothy Gershon, Johannes Albrecht, P. Hopchev, D. R. Johnson, P. Diniz Batista, Alessandro Camboni, W. Qian, M. Veltri, G. Haefeli, P. Urquijo, Michael Alexander, D. L. Perego, Yejin Zhang, Thomas Blake, D. R. Ward, V. Obraztsov, C. Gaspar, Jing Wang, Patrick Robbe, Tjeerd Ketel, Jan Buytaert, J. Harrison, Malcolm John, Stephan Eisenhardt, C. Satriano, M. Plo Casasus, M. Gandelman, R. Santinelli, R. Currie, M. P. Williams, C. Linn, K. Sobczak, V. Fave, Marianna Fontana, G. Passaleva, F. Xing, J. Luisier, C. R. Jones, S. Benson, Chung Nguyen-Mau, E. Teodorescu, D. Savrina, L. Arrabito, Ross D. Young, Mario Sannino, S. Stoica, Li Li, Manuel Schiller, Stephane Monteil, L. Esteve, G. Auriemma, A. Contu, G. N. Patrick, S. Hansmann-Menzemer, D. Websdale, G. Wilkinson, N. Gauvin, S. De Capua, Paolo Gandini, G. McGregor, E. Gushchin, A. Schopper, S. Gregson, F. Fontanelli, Eduardo Rodrigues, V. Gibson, E. Ben-Haim, J. Merkel, Th. Bauer, E. Grauges, M. van Beuzekom, Valery Pugatch, J. Panman, T. Huse, S. Swientek, Markus Frank, M. Deissenroth, F. Maciuc, J. Benton, R. Mountain, P. Sail, O. Callot, Michal Kreps, D. Wiedner, A. D. Webber, M. Nicol, B. K. Pal, T. M. Karbach, R. De Simone, T. Ruf, F. Machefert, A. Petrella, A. Zhelezov, A. Powell, B. Rakotomiaramanana, F. Constantin, M. Savrie, V. Heijne, J. Garra Tico, J. Keaveney, L. Martin, Y.N. Gao, F. Ferreira Rodrigues, C. Patrignani, K. Kruzelecki, B. Jost, C. Coca, M. Benayoun, V. Tisserand, P. Hunt, C. Barschel, A. Cook, M. De Cian, Ph. Charpentier, P. Collins, Marco Adinolfi, V. Niess, P. Jaton, J. van Tilburg, Giovanni Carboni, G. Lanfranchi, M.-N. Minard, P. Spradlin, A. Vorobyev, S. Farry, T. Lesiak, Gianluigi Casse, J. Prisciandaro, Mikhail Zavertyaev, S. Donleavy, I. Videau, G. Fardell, S. Oggero, C. Potterat, S. Kandybei, C. Salzmann, A. Petrolini, A. Jaeger, C. Parkes, Marco Clemencic, R. Muresan, S. Playfer, A. Buechler-Germann, J. Blouw, R. Graciani Diaz, Philip Ilten, A. Sparkes, K. Kreplin, M. Liles, V. Balagura, Hugh Philip Skottowe, Stephane T'Jampens, D. Martinez Santos, M. Seco, N. Mangiafave, N. Tuning, E. Jans, Nikolay Bondar, Themistocles Bowcock, M. S. Rangel, R. Santacesaria, A. Martín Sánchez, E. Maurice, Andrea Bizzeti, S. Miglioranzi, Xavier Vilasis-Cardona, R. Vazquez Gomez, A. A. Affolder, J. Anderson, A. Pérez-Calero Yzquierdo, V. Iakovenko, A. Kozlinskiy, A. Dovbnya, Neville Harnew, M. Patel, G. Alkhazov, F. Blanc, M. Grabalosa Gándara, S. Nies, R. W. Lambert, A. Martens, F. F. Jing, O. Okhrimenko, T. Britton, Ph. Ghez, A. Sciubba, R. Lefèvre, V. N. La Thi, A. Tsaregorodtsev, Rajesh Kumar, Laurence Carson, K. Holubyev, F. Teubert, R. Vazquez Regueiro, J. Lefrançois, J. Bressieux, J. P. Lees, K. Ciba, G. J. Rogers, Roberta Cardinale, S. Ogilvy, B. Gui, M. Shapkin, P. Morawski, J. Marks, W. Baldini, O. Aquines Gutierrez, Sergey Barsuk, H. Ruiz, Kurt Rinnert, B. Jean-Marie, Julien Cogan, M. Orlandea, J. He, J. Mylroie-Smith, B. Khanji, Y. Shcheglov, Sheldon Stone, T. Kvaratskheliya, W. Bonivento, B. Maynard, M. Straticiuc, G. A. Cowan, D. van Eijk, S. Koblitz, P. Schaack, R. Nandakumar, H. V. Cliff, S. Brisbane, Hans Dijkstra, O. Steinkamp, O. Yushchenko, D. Hynds, D. Galli, Federico Alessio, E. Thomas, Tomasz Szumlak, U. Straumann, Olivier Deschamps, D. A. Roa Romero, Marina Artuso, V. Shevchenko, D. Dossett, A. Bates, G. D. Lafferty, Flavio Archilli, B. Muryn, N. A. Smith, E. van Herwijnen, C. Farinelli, M. Perrin-Terrin, C. Blanks, J. Dickens, S. Perazzini, M. Calvo Gomez, Guoming Liu, L. Wiggers, F. F. Wilson, J. Rouvinet, R. McNulty, Ch. Elsasser, A. Zvyagin, P. Szczypka, M. Musy, I. Raniuk, Pierluigi Campana, I. Burducea, R. Silva Coutinho, N. Lopez-March, A. Bien, L. A. Granado Cardoso, A. A. Alves, R. Ekelhof, M. T. Tran, G. Graziani, N. H. Brook, L. Zhong, L. Kravchuk, Alessandro Cardini, J. M. De Miranda, Marc S. Williams, V. K. Subbiah, A. Bay, J. Serrano, G. Corti, T. Brambach, J-C. Garnier, R. Dzhelyadin, A. Lai, Paul Fraser Harrison, A. Puig Navarro, J. van Leerdam, G. Raven, Dmitry Popov, S. A. Wotton, Elie Aslanides, Peter Clarke, H. Voss, L. De Paula, R. Plackett, D. Decamp, A. Golutvin, Rudolf Oldeman, R. Harji, Marco Cattaneo, B. Dalmagne, C. Adrover, J. Garofoli, Howard Gordon, F. Eisele, J. Nardulli, A. Gallas Torreira, V. Vagnoni, Yongsun Kim, Nicola Serra, P. Naik, J. Wishahi, R. Lindner, I. Nasteva, E. De Lorenzi, C. Bauer, E. Lanciotti, D. Moran, U. Marconi, Yuehong Xie, A. Pazos Alvarez, Mark Whitehead, G. Ciezarek, B. Schmidt, M. Knecht, R. Jacobsson, S. Schleich, M. Schmelling, A. Bobrov, David Hutchcroft, Dmitry Golubkov, R. Messi, Nicholas Adam Styles, Lars Eklund, V. Bocci, D. Pinci, M. Pappagallo, C. Eames, V. Egorychev, Werner Hofmann, Ziad Ajaltouni, V. Romanovsky, P. Seyfert, C. Haen, B. Viaud, N. Sagidova, M. Szczekowski, M. Matveev, Zishuo Yang, M. Palutan, M. O. Bettler, V. V. Gligorov, Nikolay Nikitin, Gianni Penso, L. Li Gioi, A. C. dos Reis, Carmelo D'Ambrosio, G. Pessina, E. Perez Trigo, S. Topp-Joergensen, M. Kucharczyk, D. A. Milanes, T. Gys, M. Deckenhoff, J. J. Saborido Silva, P. Rodriguez Perez, J. M. Otalora Goicochea, Olivier Leroy, E. G. Zverev, J. Palacios, Bo Liu, Ivan Belyaev, A. Artamonov, H. Brown, D. Esperante Pereira, V. Fernandez Albor, M. Frosini, M. Tobin, Mariusz Witek, K. Carvalho Akiba, Robert Appleby, D. S. Bailey, C. Bozzi, K. Senderowska, M. M. Reid, R. J. Barlow, Marta Calvi, E. Fanchini, F. Soomro, Jonas Rademacker, Stephen M. Stahl, N. Neufeld, G. Manca, O. Schneider, Karol Hennessy, M. Charles, B. B. Shao, and M. Meissner

Subjects
Delta, Physics, Nuclear and High Energy Physics, Large Hadron Collider, 010308 nuclear & particles physics, Oscillation, 7. Clean energy, 01 natural sciences, Nuclear physics, Decay time, 0103 physical sciences, Pi, 010306 general physics, Bar (unit)
Abstract

The B-s(0)-(B) over bar (0)(s) oscillation frequency Delta m(s) is measured with 36 pb(-1) of data collected in pp collisions at = 7 TeV by the LHCb experiment at the Large Hadron Collider. A total of 1381 B-s(0) -> D-s(-) pi(+) and B-s(0) -> D-s(-) pi(+)pi(-)pi(+) signal decays are reconstructed, with average decay time resolutions of 44 fs and 36 fs, respectively. An oscillation signal with a statistical significance of 4.6 sigma is observed. The measured oscillation frequency is Delta m(s) = 17.63 +/- 0.11 (stat) +/-0.02 (syst)ps(-1) (C) 2012 CERN. Published by Elsevier B.V. All rights reserved.

Published
2012
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38. Measurement of the CP violating phase ϕs in B¯s0→J/ψf0(980)

Author

R. Aaij, C. Abellan Beteta, B. Adeva, M. Adinolfi, C. Adrover, A. Affolder, Z. Ajaltouni, J. Albrecht, F. Alessio, M. Alexander, G. Alkhazov, P. Alvarez Cartelle, A.A. Alves, S. Amato, Y. Amhis, J. Anderson, R.B. Appleby, O. Aquines Gutierrez, F. Archilli, L. Arrabito, A. Artamonov, M. Artuso, E. Aslanides, G. Auriemma, S. Bachmann, J.J. Back, D.S. Bailey, V. Balagura, W. Baldini, R.J. Barlow, C. Barschel, S. Barsuk, W. Barter, A. Bates, C. Bauer, Th. Bauer, A. Bay, I. Bediaga, S. Belogurov, K. Belous, I. Belyaev, E. Ben-Haim, M. Benayoun, G. Bencivenni, S. Benson, J. Benton, R. Bernet, M.-O. Bettler, M. van Beuzekom, A. Bien, S. Bifani, T. Bird, A. Bizzeti, P.M. Bjørnstad, T. Blake, F. Blanc, C. Blanks, J. Blouw, S. Blusk, A. Bobrov, V. Bocci, A. Bondar, N. Bondar, W. Bonivento, S. Borghi, A. Borgia, T.J.V. Bowcock, C. Bozzi, T. Brambach, J. van den Brand, J. Bressieux, D. Brett, M. Britsch, T. Britton, N.H. Brook, H. Brown, A. Büchler-Germann, I. Burducea, A. Bursche, J. Buytaert, S. Cadeddu, O. Callot, M. Calvi, M. Calvo Gomez, A. Camboni, P. Campana, A. Carbone, G. Carboni, R. Cardinale, A. Cardini, L. Carson, K. Carvalho Akiba, G. Casse, M. Cattaneo, Ch. Cauet, M. Charles, Ph. Charpentier, N. Chiapolini, K. Ciba, X. Cid Vidal, G. Ciezarek, P.E.L. Clarke, M. Clemencic, H.V. Cliff, J. Closier, C. Coca, V. Coco, J. Cogan, P. Collins, A. Comerma-Montells, F. Constantin, A. Contu, A. Cook, M. Coombes, G. Corti, G.A. Cowan, R. Currie, C. DʼAmbrosio, P. David, P.N.Y. David, I. De Bonis, S. De Capua, M. De Cian, F. De Lorenzi, J.M. De Miranda, L. De Paula, P. De Simone, D. Decamp, M. Deckenhoff, H. Degaudenzi, L. Del Buono, C. Deplano, D. Derkach, O. Deschamps, F. Dettori, J. Dickens, H. Dijkstra, P. Diniz Batista, F. Domingo Bonal, S. Donleavy, F. Dordei, A. Dosil Suárez, D. Dossett, A. Dovbnya, F. Dupertuis, R. Dzhelyadin, A. Dziurda, S. Easo, U. Egede, V. Egorychev, S. Eidelman, D. van Eijk, F. Eisele, S. Eisenhardt, R. Ekelhof, L. Eklund, Ch. Elsasser, D. Elsby, D. Esperante Pereira, L. Estève, A. Falabella, E. Fanchini, C. Färber, G. Fardell, C. Farinelli, S. Farry, V. Fave, V. Fernandez Albor, M. Ferro-Luzzi, S. Filippov, C. Fitzpatrick, M. Fontana, F. Fontanelli, R. Forty, M. Frank, C. Frei, M. Frosini, S. Furcas, A. Gallas Torreira, D. Galli, M. Gandelman, P. Gandini, Y. Gao, J.-C. Garnier, J. Garofoli, J. Garra Tico, L. Garrido, D. Gascon, C. Gaspar, N. Gauvin, M. Gersabeck, T. Gershon, Ph. Ghez, V. Gibson, V.V. Gligorov, C. Göbel, D. Golubkov, A. Golutvin, A. Gomes, H. Gordon, M. Grabalosa Gándara, R. Graciani Diaz, L.A. Granado Cardoso, E. Graugés, G. Graziani, A. Grecu, E. Greening, S. Gregson, B. Gui, E. Gushchin, Yu. Guz, T. Gys, G. Haefeli, C. Haen, S.C. Haines, T. Hampson, S. Hansmann-Menzemer, R. Harji, N. Harnew, J. Harrison, P.F. Harrison, T. Hartmann, J. He, V. Heijne, K. Hennessy, P. Henrard, J.A. Hernando Morata, E. van Herwijnen, E. Hicks, K. Holubyev, P. Hopchev, W. Hulsbergen, P. Hunt, T. Huse, R.S. Huston, D. Hutchcroft, D. Hynds, V. Iakovenko, P. Ilten, J. Imong, R. Jacobsson, A. Jaeger, M. Jahjah Hussein, E. Jans, F. Jansen, P. Jaton, B. Jean-Marie, F. Jing, M. John, D. Johnson, C.R. Jones, B. Jost, M. Kaballo, S. Kandybei, M. Karacson, T.M. Karbach, J. Keaveney, I.R. Kenyon, U. Kerzel, T. Ketel, A. Keune, B. Khanji, Y.M. Kim, M. Knecht, P. Koppenburg, A. Kozlinskiy, L. Kravchuk, K. Kreplin, M. Kreps, G. Krocker, P. Krokovny, F. Kruse, K. Kruzelecki, M. Kucharczyk, T. Kvaratskheliya, V.N. La Thi, D. Lacarrere, G. Lafferty, A. Lai, D. Lambert, R.W. Lambert, E. Lanciotti, G. Lanfranchi, C. Langenbruch, T. Latham, C. Lazzeroni, R. Le Gac, J. van Leerdam, J.-P. Lees, R. Lefèvre, A. Leflat, J. Lefrançois, O. Leroy, T. Lesiak, L. Li, L. Li Gioi, M. Lieng, M. Liles, R. Lindner, C. Linn, B. Liu, G. Liu, J. von Loeben, J.H. Lopes, E. Lopez Asamar, N. Lopez-March, H. Lu, J. Luisier, A. Mac Raighne, F. Machefert, I.V. Machikhiliyan, F. Maciuc, O. Maev, J. Magnin, S. Malde, R.M.D. Mamunur, G. Manca, G. Mancinelli, N. Mangiafave, U. Marconi, R. Märki, J. Marks, G. Martellotti, A. Martens, L. Martin, A. Martín Sánchez, D. Martinez Santos, A. Massafferri, Z. Mathe, C. Matteuzzi, M. Matveev, E. Maurice, B. Maynard, A. Mazurov, G. McGregor, R. McNulty, M. Meissner, M. Merk, J. Merkel, R. Messi, S. Miglioranzi, D.A. Milanes, M.-N. Minard, J. Molina Rodriguez, S. Monteil, D. Moran, P. Morawski, R. Mountain, I. Mous, F. Muheim, K. Müller, R. Muresan, B. Muryn, B. Muster, M. Musy, J. Mylroie-Smith, P. Naik, T. Nakada, R. Nandakumar, I. Nasteva, M. Nedos, M. Needham, N. Neufeld, C. Nguyen-Mau, M. Nicol, V. Niess, N. Nikitin, A. Nomerotski, A. Novoselov, A. Oblakowska-Mucha, V. Obraztsov, S. Oggero, S. Ogilvy, O. Okhrimenko, R. Oldeman, M. Orlandea, J.M. Otalora Goicochea, P. Owen, K. Pal, J. Palacios, A. Palano, M. Palutan, J. Panman, A. Papanestis, M. Pappagallo, C. Parkes, C.J. Parkinson, G. Passaleva, G.D. Patel, M. Patel, S.K. Paterson, G.N. Patrick, C. Patrignani, C. Pavel-Nicorescu, A. Pazos Alvarez, A. Pellegrino, G. Penso, M. Pepe Altarelli, S. Perazzini, D.L. Perego, E. Perez Trigo, A. Pérez-Calero Yzquierdo, P. Perret, M. Perrin-Terrin, G. Pessina, A. Petrella, A. Petrolini, A. Phan, E. Picatoste Olloqui, B. Pie Valls, B. Pietrzyk, T. Pilař, D. Pinci, R. Plackett, S. Playfer, M. Plo Casasus, G. Polok, A. Poluektov, E. Polycarpo, D. Popov, B. Popovici, C. Potterat, A. Powell, J. Prisciandaro, V. Pugatch, A. Puig Navarro, W. Qian, J.H. Rademacker, B. Rakotomiaramanana, M.S. Rangel, I. Raniuk, G. Raven, S. Redford, M.M. Reid, A.C. dos Reis, S. Ricciardi, K. Rinnert, D.A. Roa Romero, P. Robbe, E. Rodrigues, F. Rodrigues, P. Rodriguez Perez, G.J. Rogers, S. Roiser, V. Romanovsky, M. Rosello, J. Rouvinet, T. Ruf, H. Ruiz, G. Sabatino, J.J. Saborido Silva, N. Sagidova, P. Sail, B. Saitta, C. Salzmann, M. Sannino, R. Santacesaria, C. Santamarina Rios, R. Santinelli, E. Santovetti, M. Sapunov, A. Sarti, C. Satriano, A. Satta, M. Savrie, D. Savrina, P. Schaack, M. Schiller, S. Schleich, M. Schlupp, M. Schmelling, B. Schmidt, O. Schneider, A. Schopper, M.-H. Schune, R. Schwemmer, B. Sciascia, A. Sciubba, M. Seco, A. Semennikov, K. Senderowska, I. Sepp, N. Serra, J. Serrano, P. Seyfert, M. Shapkin, I. Shapoval, P. Shatalov, Y. Shcheglov, T. Shears, L. Shekhtman, O. Shevchenko, V. Shevchenko, A. Shires, R. Silva Coutinho, T. Skwarnicki, A.C. Smith, N.A. Smith, E. Smith, K. Sobczak, F.J.P. Soler, A. Solomin, F. Soomro, B. Souza De Paula, B. Spaan, A. Sparkes, P. Spradlin, F. Stagni, S. Stahl, O. Steinkamp, S. Stoica, S. Stone, B. Storaci, M. Straticiuc, U. Straumann, V.K. Subbiah, S. Swientek, M. Szczekowski, P. Szczypka, T. Szumlak, S. TʼJampens, E. Teodorescu, F. Teubert, C. Thomas, E. Thomas, J. van Tilburg, V. Tisserand, M. Tobin, S. Topp-Joergensen, N. Torr, E. Tournefier, M.T. Tran, A. Tsaregorodtsev, N. Tuning, M. Ubeda Garcia, A. Ukleja, P. Urquijo, U. Uwer, V. Vagnoni, G. Valenti, R. Vazquez Gomez, P. Vazquez Regueiro, S. Vecchi, J.J. Velthuis, M. Veltri, B. Viaud, I. Videau, X. Vilasis-Cardona, J. Visniakov, A. Vollhardt, D. Volyanskyy, D. Voong, A. Vorobyev, H. Voss, S. Wandernoth, J. Wang, D.R. Ward, N.K. Watson, A.D. Webber, D. Websdale, M. Whitehead, D. Wiedner, L. Wiggers, G. Wilkinson, M.P. Williams, M. Williams, F.F. Wilson, J. Wishahi, M. Witek, W. Witzeling, S.A. Wotton, K. Wyllie, Y. Xie, F. Xing, Z. Xing, Z. Yang, R. Young, O. Yushchenko, M. Zavertyaev, F. Zhang, L. Zhang, W.C. Zhang, Y. Zhang, A. Zhelezov, L. Zhong, E. Zverev, and A. Zvyagin

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, 0103 physical sciences, Detector, Mass spectrum, Analytical chemistry, High Energy Physics::Experiment, 010306 general physics, 01 natural sciences
Abstract

The decay Bs -> J/\psi K+ K- is investigated using 0.16/fb of data collected with the LHCb detector using 7 TeV pp collisions. Although the J/\psi \phi\ channel is well known, final states at higher K+K- masses have not previously been studied. In the K+K- mass spectrum we observe a significant signal in the f'2(1525) region as well as a non-resonant component. After subtracting the non-resonant component, we find B(Bs->J/\psi f'_2(1525))/B(Bs->J/\psi \phi)=(26.4 +/- 2.7 +/- 2.4)%.

Published
2012
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39. Search for the rare decays Bs0→μ+μ− and B0→μ+μ−

Author

E. Greening, Patrick Koppenburg, A. C. Smith, Lei Zhang, F. J. P. Soler, Sandro Cadeddu, S. C. Haines, D. Lacarrere, M. Lieng, C. Langenbruch, B. Storaci, C. Matteuzzi, Roland Bernet, E. Picatoste Olloqui, T. Pilar, S. Wandernoth, M. Nedos, A. Vollhardt, L. Garrido, P. Urquijo, Michael Alexander, W. C. Zhang, A.E. Bondar, P. M. Bjørnstad, G. Valenti, P. Jaton, Giovanni Carboni, Th. Bauer, I. V. Machikhiliyan, K. Kreplin, F. Constantin, M. Liles, Marianna Fontana, Thomas Blake, G. Passaleva, F. Xing, J. Luisier, O. Shevchenko, P. Owen, S. Vecchi, G. Alkhazov, V. Gibson, M. Seco, M. van Beuzekom, T. Huse, A. Martín Sánchez, T. Ruf, K. Mueller, Yasmine Amhis, E. Maurice, V. Niess, G. Lanfranchi, M.-N. Minard, A. Vorobyev, J. Bressieux, D. R. Johnson, Jonas Rademacker, Stephen M. Stahl, F. Dordei, C. Faerber, M. H. Schune, U. Uwer, N. Neufeld, E. Grauges, M. Shapkin, Y. Shcheglov, N. Chiapolini, I. Sepp, D. van Eijk, M. Frosini, O. Yushchenko, Ph. Charpentier, G. Manca, O. Schneider, F. Machefert, C. R. Jones, K. Carvalho Akiba, M. Tobin, Karol Hennessy, E. Ben-Haim, S. Belogurov, M. Charles, B. B. Shao, C. Lazzeroni, M. Meissner, T. Kvaratskheliya, I. Videau, C. Blanks, Robert Appleby, A. Bien, D. Hynds, D. Galli, O. Callot, A. Cook, S. Oggero, A. Palano, Tomasz Szumlak, M. M. Reid, Marina Artuso, O. Maev, Tomasz Skwarnicki, Sebastian Bachmann, L. Carson, C. Barschel, D. S. Bailey, A. Novoselov, A. A. Alves, I. Shapoval, A. Mac Raighne, M. Schlupp, M. Jahjah Hussein, Mikhail Zavertyaev, S. Playfer, W. Witzeling, J. Dickens, M. Calvo Gomez, Guoming Liu, C. Parkes, M. Kaballo, F. De Lorenzi, A. Pérez-Calero Yzquierdo, V. Iakovenko, C. Bozzi, K. Senderowska, B. Pie Valls, V. Obraztsov, M. Knecht, G. Ciezarek, R. Jacobsson, Themistocles Bowcock, Stephan Eisenhardt, G. Fardell, G. Corti, T. Brambach, E. Tournefier, A. Kozlinskiy, A. Ukleja, S. Filippov, C. Santamarina Rios, S. Schleich, K. Wyllie, B. Pietrzyk, R. Dzhelyadin, A. Lai, Dmitry Golubkov, R. Messi, G. Martellotti, A. Solomin, A. Dovbnya, Antonio Pellegrino, David Hutchcroft, R. Maerki, R. J. Barlow, R. Schwemmer, N. Tuning, N. Lopez-March, Kurt Rinnert, E. Polycarpo, Tatsuya Nakada, S. Ogilvy, W. D. Hulsbergen, J. Imong, M. Ferro-Luzzi, N. Gauvin, S. De Capua, B. Schmidt, A. Bobrov, F. Dupertuis, P. Alvarez Cartelle, G. J. Rogers, R. Plackett, G. Bencivenni, F. Maciuc, Marta Calvi, E. Fanchini, Howard Gordon, F. Eisele, D. Elsby, T. du Pree, H. V. Cliff, C. Adrover, J. Mylroie-Smith, Jibo He, Federico Alessio, P. Schaack, F. Soomro, M. Merk, X. Cid Vidal, F. Muheim, J. Wishahi, B. Gui, Bo Liu, M. Veltri, G. Haefeli, V. Bocci, Ch. Elsasser, Sandra Amato, K. Belous, B. Muster, U. Kerzel, Ivan Belyaev, Tara Shears, D. Pinci, M. Pepe Altarelli, Marco Gersabeck, S. Benson, G. N. Patrick, G. Wilkinson, V. Egorychev, A. Bates, G. D. Lafferty, M. Perrin-Terrin, M. T. Tran, Valery Pugatch, Markus Frank, A. A. Affolder, A. Artamonov, N. A. Smith, E. van Herwijnen, R. Ekelhof, Anton Poluektov, T. E. Latham, N. Torr, Alexander Leflat, H. Brown, M. Szczekowski, B. Jean-Marie, Z. Mathe, Christine Mclean, V. K. Subbiah, Barbara Sciascia, Yang Gao, A. Zhelezov, B. Maynard, J. van Tilburg, H. Lu, S. K. Paterson, C. Thomas, T. J. Gershon, P. Hopchev, P. Diniz Batista, C. Potterat, B. D'Almagne, Elie Aslanides, C. J. Parkinson, D. Esperante Pereira, J. Anderson, D. Lambert, G. D. Patel, L. Del Bouno, Nikolay Nikitin, N. Mangiafave, Alessio Sarti, Patrick Robbe, V. Fernandez Albor, T. M. Karbach, C. Linn, A. Semennikov, D. Brett, D. Savrina, A. Petrolini, Philip Ilten, L. Arrabito, R. W. Lambert, E. Teodorescu, J. Serrano, J. F. J. van den Brand, Yongsun Kim, Nicola Serra, Yejin Zhang, S. Stoica, P. E. L. Clarke, M. Britsch, Roberta Cardinale, F. Kruse, B. De Souza Paula, A. C. dos Reis, K. Holubyev, D. Moran, J. Albrect, U. Marconi, G. McGregor, F. Teubert, J. Lefrançois, Paul Fraser Harrison, S. Gregson, E. Lopez Asamar, Simone Bifani, Lars Eklund, Pavel Shatalov, A. Petrella, W. Baldini, J. Benton, G. Mancinelli, Conor Fitzpatrick, Ziad Ajaltouni, P. Sail, A. Satta, Denis Derkach, Mario Sannino, K. Pal, F. Ferreira Rodrigues, Ulrik Egede, F. Jansen, D. Websdale, P. Henrard, K. Kruzelecki, A. Puig Navarro, S. Monteil, C. Deplano, M. Grabalosa Gándara, P. Seyfert, D. L. Perego, P. David, C. Satriano, V. N. La Thi, A. Tsaregorodtsev, J. Magnin, Sheldon Stone, F. Blanc, L. Martin, G. Polok, I. Mous, L. Esteve, P. Spradlin, G. Auriemma, A. Contu, B. Viaud, Olivier Leroy, E. G. Zverev, N. Sagidova, J. Palacios, J. Prisciandaro, R. Lefèvre, A. Papanestis, A. Grecu, J. J. Back, Li Li, Manuel Schiller, Bernardo Adeva, S. Easo, L. Wiggers, F. F. Wilson, I. Burducea, G. Graziani, P. N. Y. David, David Gascon, C. Abellan Beteta, A. Borgia, Tjeerd Ketel, P. Vazquez Regueiro, R. Silva Coutinho, Dmitry Popov, R. Muresan, G. Penso, V. Balagura, M. Savrie, Andrei Nomerotski, V. Heijne, J. Garra Tico, J. Keaveney, A. Gomes, A. Martens, Xavier Vilasis-Cardona, R. Santacesaria, Marco Cattaneo, M. Patel, N. K. Watson, P. Naik, Agnieszka Oblakowska-Mucha, C. Pavel-Nicorescu, L. A. Granado Cardoso, U. Straumann, N. H. Brook, Olivier Deschamps, Flavio Archilli, E. Hicks, T. Hampson, J. Harrison, Julien Cogan, J. Molina Rodriguez, Zhenwei Yang, C. Goebel, P. Hunt, M. Schmelling, P. Collins, M. Nicol, I. R. Kenyon, J. Rouvinet, M. Pappagallo, S.I. Eidelman, J. H. Lopes, S. Kandybei, C. Salzmann, R. McNulty, S. Blusk, S. Ricciardi, S. Redford, Christoph Frei, Ross D. Young, Hans Dijkstra, Alessandro Camboni, A. Dziurda, R. Graciani Diaz, D. Volyanskyy, Ch. Cauet, W. Qian, Neville Harnew, P. J. Dornan, Paolo Gandini, Chung Nguyen-Mau, V. Romanovsky, G. Krocker, J. Merkel, M. Ubeda Garcia, M. De Cian, S. Swientek, L. Shekhtman, A. Dosil Suárez, A. Jaeger, J. M. Otalora Goicochea, A. Buechler-Germann, J. Blouw, F. F. Jing, P. Morawski, Andrea Bizzeti, S. Miglioranzi, C. Patrignani, W. Bonivento, L. Zhong, V. Tisserand, Z. Xing, Yu. Guz, S. Farry, P. De Simone, H. Voss, Victor Coco, Gianluigi Casse, B. Spaan, J. Closier, A. Massafferri, E. Perez Trigo, J. A. Hernando Morata, C. Haen, Roel Aaij, R. M. D. Mamunur, D. A. Roa Romero, D. R. Ward, E. Jans, M. S. Rangel, Fan Zhang, R. Vazquez Gomez, C. Gaspar, Jing Wang, S. Topp-Joergensen, A. Mazurov, Silvia Borghi, M. Kucharczyk, D. A. Milanes, T. Gys, Pavel Krokovny, M. Deckenhoff, M. Karacson, T. Bird, M. Matveev, J. J. Saborido Silva, J. Panman, P. Rodriguez Perez, Carmelo D'Ambrosio, A. Shires, A. Comerma-Montells, Michal Kreps, B. Jost, K. Ciba, C. Coca, M. Palutan, M. O. Bettler, V. V. Gligorov, M. Benayoun, F. Domingo Bonal, G. Conti, S. Donleavy, A. Phan, H. Degaudenzi, R. Currie, M. P. Williams, S. Hansmann-Menzemer, Marco Clemencic, P. Perret, O. Aquines Gutierrez, Sergey Barsuk, A. Schopper, H. Ruiz, M. Orlandea, F. Fontanelli, R. Mountain, M. Deissenroth, T. Lesiak, A. Powell, B. Rakotomiaramanana, Krzysztof Grzegorz Sobczak, L. Li Gioi, G. Pessina, D. Voong, R. Le Gac, E. Thomas, B. Muryn, L. Kravchuk, Alessandro Cardini, J. M. De Miranda, M. Rosello, Stephane T'Jampens, D. Martinez Santos, M. Witek, M. Needham, Francesco Dettori, J. P. Lees, V. Vagnoni, E. S. Smith, William Barter, A. Falabella, Angelo Carbone, Jaap Velthuis, M. Sapunov, Biagio Saitta, S. Malde, M. Coombes, S. Furcas, A. Zvyagin, P. Szczypka, Malcolm John, B. Popovici, M. Gandelman, M. Musy, Ignacio Bediaga, J. Visniakov, I. De Bonis, R. Santinelli, V. Fave, E. Gushchin, D. Wiedner, A. D. Webber, Roger Forty, A. Keune, E. Santovetti, Albert Bursche, S. Roiser, G. Sabatino, F. Stagni, R. S. Huston, Nikolay Bondar, Jan Buytaert, M. Plo Casasus, Marco Adinolfi, A. Sparkes, O. Okhrimenko, Ph. Ghez, A. Sciubba, J. Marks, M. Straticiuc, G. A. Cowan, R. Nandakumar, D. Dossett, S. Perazzini, Marc S. Williams, J-C. Garnier, J. Garofoli, E. Rodrigues, L. De Paula, R. Lindner, I. Nasteva, C. Bauer, E. Lanciotti, Yuehong Xie, A. Pazos Alvarez, Mark Whitehead, T. Britton, B. Khanji, V. Shevchenko, C. Farinelli, A. Bay, J. van Leerdam, G. Raven, D. Decamp, A. Golutvin, R. Harji, O. Steinkamp, I. Raniuk, Pierluigi Campana, S. A. Wotton, Rudolf Oldeman, and A. Gallas Torreira

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, 010308 nuclear & particles physics, 0103 physical sciences, 010306 general physics, 01 natural sciences
Abstract

A search for the decays Bs -> mu+ mu- and B0 -> mu+ mu- is performed with 0.37 fb^-1 of pp collisions at sqrt{s} = 7 TeV collected by the LHCb experiment in 2011. The upper limits on the branching fractions are BR (Bs -> mu+ mu-) mu+ mu-) mu+ mu-) mu+ mu-) < 3.2 x 10^-9 at 95% confidence level.

Published
2012
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40. Measurement of the effective Bs0→K+K− lifetime

Author

Bo Liu, Th. Bauer, E. Perez Trigo, Marie Nicol, F. Constantin, H. V. Cliff, Federico Alessio, Ch. Elsasser, M. T. Tran, E. Greening, T. J. Gershon, Elie Aslanides, Jonas Rademacker, Agnieszka Oblakowska-Mucha, Ivan Belyaev, P. Hunt, P. Collins, C. Langenbruch, B. Storaci, A. C. Smith, L. Li Gioi, Stephane T'Jampens, D. Martinez Santos, G. Valenti, P. M. Bjørnstad, Thomas Blake, J. Magnin, Stephen M. Stahl, C. Pavel-Nicorescu, M. van Beuzekom, T. Huse, A. Cook, S. Oggero, Patrick Koppenburg, M. Perrin-Terrin, Lei Zhang, O. Shevchenko, P. Owen, S. Playfer, G. Krocker, L. Garrido, S. Kandybei, S. Ogilvy, B. Gui, M. Kaballo, F. De Lorenzi, A. Pérez-Calero Yzquierdo, Sandro Cadeddu, J. P. Lees, F. F. Jing, C. Salzmann, L. Shekhtman, S. Topp-Joergensen, A. Dziurda, Guy Wilkinson, A. Artamonov, H. Brown, N. Neufeld, E. Thomas, D. Voong, R. Le Gac, R. Graciani Diaz, F. J. P. Soler, Neville Harnew, R. Schwemmer, S. Vecchi, M. Kucharczyk, D. A. Milanes, T. Gys, E. S. Smith, B. Maynard, J. G. Cogan, S. C. Haines, D. Lacarrere, M. Seco, M. Lieng, K. Vervink, C. Färber, P. Morawski, J. Imong, A. Papanestis, W. Bonivento, E. Hicks, R. Santacesaria, A. Martín Sánchez, W. C. Zhang, David D'Enterria, A. Dosil Suárez, Marco Adinolfi, C. Matteuzzi, M. Deckenhoff, D. Esperante Pereira, T. Skwarnicki, Yasmine Amhis, L. Zhong, M. Witek, M. Needham, G. Manca, O. Schneider, Francesco Dettori, V. Fernandez Albor, R. Oldeman, C. J. Parkinson, J. J. Saborido Silva, S. K. Paterson, P. Rodriguez Perez, Carmelo D'Ambrosio, M. Nedos, A. Vollhardt, H. Voss, M. Britsch, L. Del Buono, A. Sparkes, L. Wiggers, F. F. Wilson, I. Burducea, Victor Coco, A. Grecu, J. J. Back, Bernardo Adeva, B. Muryn, L. Kravchuk, Alessandro Cardini, S. Ricciardi, J. M. De Miranda, M. Rosello, Johannes Albrecht, M. H. Schune, Marianna Fontana, Karol Hennessy, M. Charles, B. B. Shao, A. Falabella, Biagio Saitta, M. Meissner, I. Videau, T. J. V. Bowcock, P. Urquijo, Tara Shears, A. Zvyagin, P. Szczypka, M. Musy, D. R. Johnson, Li Li, Manuel Schiller, Anton Poluektov, F. Soomro, N. Torr, Alexander Leflat, X. Cid Vidal, F. Muheim, V. Gibson, U. Uwer, Malcolm John, M. Gandelman, R. Santinelli, V. Fave, J. Visniakov, M. Veltri, G. Haefeli, M. Szczekowski, T. M. Karbach, A. Semennikov, D. Brett, I. De Bonis, Valery Pugatch, Tjeerd Ketel, A. Büchler-Germann, A. Gomes, L. A. Granado Cardoso, N. H. Brook, C. R. Jones, J. Garofoli, C. Haen, A. Tsaregorodtsev, Yongsun Kim, D. R. Ward, A. A. Affolder, E. Gushchin, Nicola Serra, N. Chiapolini, T. Ruf, J. Bressieux, E. Ben-Haim, V. Vagnoni, J. Anderson, Roland Bernet, E. Picatoste Olloqui, T. Pilar, S. Wandernoth, G. Passaleva, F. Xing, J. Luisier, R. M. D. Mamunur, A. Ukleja, D. Wiedner, K. Carvalho Akiba, D. Hynds, D. Galli, Marina Artuso, F. Kruse, S. Brisbane, A. Zhelezov, G. D. Patel, K. Wacker, Yejin Zhang, C. Barschel, D. Moran, A. D. Webber, I. Sepp, Alessio Sarti, V. Niess, E. Grauges, F. Machefert, G. Lanfranchi, M.-N. Minard, M. Grabalosa Gándara, B. Khanji, A. Vorobyev, F. Dordei, F. Dupertuis, P. Alvarez Cartelle, Sandra Amato, A. Bondar, K. Belous, P. Diniz Batista, Antonio Pellegrino, O. Leroy, C. Linn, Pavel Shatalov, Nikolay Nikitin, M. M. Reid, Mikhail Zavertyaev, Silvia Borghi, Z. Xing, M. Karacson, U. Marconi, A. Novoselov, M. Savrie, Yu. Guz, E. Tournefier, S. Filippov, R. Mountain, William Barter, Stephane Monteil, S. Gregson, Audrey Jaeger, V. Heijne, J. Garra Tico, P. De Simone, A. Satta, M. Matveev, Zishuo Yang, W. Witzeling, M. Palutan, Angelo Carbone, M. O. Bettler, J. Rouvinet, R. McNulty, C. Parkes, P. Krokovny, C. Göbel, M. Ferro-Luzzi, Jaap Velthuis, O. Maev, E. Polycarpo, Tatsuya Nakada, Sebastian Bachmann, R. Lindner, J. Keaveney, I. Nasteva, B. Pie Valls, G. Bencivenni, F. Domingo Bonal, B. Spaan, V. V. Gligorov, O. Callot, C. Bauer, M. Sapunov, Kurt Rinnert, O. Steinkamp, Gianni Penso, A. Petrolini, H. Degaudenzi, J. Mylroie-Smith, Y.N. Gao, P. Schaack, L. Martin, M. Knecht, Krzysztof Grzegorz Sobczak, J. Closier, A. Massafferri, G. Pessina, Dmitry Golubkov, V. Obraztsov, Pierre Henrard, Stephan Eisenhardt, Nikolay Bondar, J. M. Caicedo Carvajal, J. Harrison, I. Shapoval, N. Gauvin, S. De Capua, R. Messi, N. Tuning, D. L. Perego, J. A. Hernando Morata, C. Satriano, C. Santamarina Rios, E. Lanciotti, L. Esteve, Roel Aaij, S. Malde, O. Okhrimenko, F. Maciuc, Hans Dijkstra, F. Fontanelli, P. E. L. Clarke, M. Deissenroth, P. Jaton, Giovanni Carboni, G. Fardell, R. Muresan, Ross D. Young, V. Balagura, Plamen Hristov Hopchev, M. Coombes, G. Auriemma, B. Rakotomiaramanana, A. Contu, I. Raniuk, Pierluigi Campana, M. Schmelling, Marwa Jahjah-Hussein, E. G. Zverev, M. Pappagallo, Hugh Philip Skottowe, J. H. Lopes, Ph. Ghez, A. Sciubba, Andrei Nomerotski, I. V. Machikhiliyan, K. Kreplin, C. Gaspar, Jing Wang, A. Mazurov, M. Liles, A. Kozlinskiy, T. du Pree, A. Dovbnya, M. Pepe Altarelli, V. Romanovsky, S. Blusk, Alessandro Camboni, K. Wyllie, A. C. dos Reis, J. M. Otalora Goicochea, J. Palacios, A. Martens, Xavier Vilasis-Cardona, M. Frosini, Rajesh Kumar, Laurence Carson, W. Qian, Marco Gersabeck, Paolo Gandini, J. Merkel, S. Swientek, K. Müller, V. Bocci, Chung Nguyen-Mau, B. Pietrzyk, S. Furcas, B. Popovici, J. Marks, Emilie Maurice, G. Martellotti, A. Solomin, C. Patrignani, Paras Naik, W. D. Hulsbergen, G. J. Rogers, Ignacio Bediaga, Markus Frank, Lars Eklund, M. Tobin, S. Belogurov, M. Straticiuc, J. Panman, D. Pinci, M. Merk, G. A. Cowan, V. Egorychev, F. Jansen, K. Holubyev, F. Teubert, M. Ubeda Garcia, M. De Cian, Ziad Ajaltouni, E. Lopez Asamar, S. A. Wotton, A. Shires, K. Pal, V. Tisserand, M. Patel, S. Farry, C. Deplano, R. Nandakumar, A. Comerma-Montells, Michal Kreps, J. Lefrançois, B. Jost, C. Coca, M. Benayoun, J. Blouw, Yuehong Xie, G. Mancinelli, Conor Fitzpatrick, B. Jean-Marie, N. A. Smith, E. van Herwijnen, Mario Sannino, A. Bates, G. D. Lafferty, D. Savrina, L. Arrabito, Andrea Bizzeti, S. Miglioranzi, C. Thomas, J. Serrano, G. Conti, R. Ekelhof, D. Websdale, C. Potterat, D. Dossett, K. Kruzelecki, G. Polok, Gianluigi Casse, D. S. Bailey, R. Currie, M. P. Williams, C. Bozzi, K. Senderowska, B. D'Almagne, A. Pazos Alvarez, W. Baldini, A. Powell, A. Petrella, I. Mous, S. Hansmann-Menzemer, V. N. La Thi, N. Mangiafave, P. Seyfert, A. Schopper, U. Egede, S. Perazzini, Sheldon Stone, A. Gallas Torreira, P. Spradlin, S. Benson, Diego Alejandro Roa Romero, G. N. Patrick, Mark Whitehead, V. Iakovenko, S. Donleavy, D. van Eijk, D. E. Hutchcroft, E. Jans, J. Prisciandaro, B. Viaud, N. Sagidova, R. J. Barlow, Marta Calvi, E. Fanchini, O. Yushchenko, U. Straumann, Marc S. Williams, V. Shevchenko, C. Farinelli, T. Lesiak, Marco Clemencic, G. Alkhazov, Olivier Deschamps, M. S. Rangel, Fan Zhang, R. Vazquez Gomez, A. Bien, C. Blanks, Flavio Archilli, A. A. Alves, Pascal Perret, J. Dickens, M. Calvo Gomez, Guoming Liu, A. Bobrov, G. Corti, R. Silva Coutinho, R. Plackett, T. Brambach, Howard Gordon, F. Eisele, J. Nardulli, N. Lopez-March, J. Wishahi, R. Dzhelyadin, A. Lai, Roger Forty, V. K. Subbiah, J-C. Garnier, A. Keune, E. Santovetti, K. Ciba, Robert Appleby, J. van Tilburg, Albert Bursche, A. Bay, E. Rodrigues, Paul Fraser Harrison, O. Aquines Gutierrez, Sergey Barsuk, H. Ruiz, Philip Ilten, J. van Leerdam, G. Raven, D. Decamp, A. Golutvin, M. Orlandea, S. Roiser, G. Sabatino, S. Nies, F. Stagni, R. S. Huston, R. W. Lambert, A. Puig Navarro, Roberta Cardinale, L. De Paula, R. Harji, M. Shapkin, Y. Shcheglov, S. Koblitz, T. Kvaratskheliya, Jan Buytaert, A. Palano, Tomasz Szumlak, G. Ciezarek, R. Jacobsson, S. Schleich, M. Plo Casasus, T. Britton, Ph. Charpentier, C. Adrover, Patrick Robbe, E. Teodorescu, S. Stoica, G. McGregor, J. Benton, P. Sail, Denis Derkach, F. Ferreira Rodrigues, T. Hampson, R. Märki, S. Eidelman, F. Blanc, R. Lefèvre, G. Graziani, P. N. Y. David, David Gascon, C. Abellan Beteta, P. Vazquez Regueiro, Dmitry Popov, Marco Cattaneo, B. Schmidt, Barbara Sciascia, Nicholas Adam Styles, S. Redford, Christoph Frei, U. Kerzel, T. E. Latham, Monica Alexander, Z. Mathe, Christine Mclean, D. Lambert, J. F. J. van den Brand, Simone Bifani, J. He, S. Easo, A. Borgia, and B. Souza De Paula

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Meson, 010308 nuclear & particles physics, Physics beyond the Standard Model, 0103 physical sciences, Atomic physics, 010306 general physics, 01 natural sciences
Abstract

A measurement of the effective $B_srightarrow K^+K^-$ lifetime is presented using approximately $37 pb^{-1}$ of data collected by LHCb during 2010. This quantity can be used to put constraints on contributions from processes beyond the Standard Model in the $B_s$ meson system and is determined by two complementary approaches as $tau_{B_sto K^+K^-} = 1.440 pm 0.096 (stat) pm 0.008 (syst) pm 0.003 (model) ps$.

Published
2012
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41. Search for a vector gauge boson in ϕ meson decays with the KLOE detector

Author

Anna Bozena Kowalewska, A. Ranieri, E. Iarocci, A. Di Domenico, Cesare Bini, Barbara Sciascia, M. Martini, C. Bloise, P. Ciambrone, Cecilia Taccini, I. Prado Longhi, Vincenzo Patera, Andrzej Kupsc, P. Franzini, Giuseppe Mandaglio, G. Venanzoni, L. Iafolla, S. Fiore, Bo Höistad, G. De Robertis, Marco Schioppa, A. Sciubba, F. Bossi, E. Graziani, D. Domenici, C. F. Redmer, Davide Badoni, G. Bencivenni, S. A. Bulychjev, L. Tortora, R. Messi, M. Matsyuk, S. Giovannella, G. Felici, Jarosław Zdebik, D. Babusci, F. Ceradini, G. De Zorzi, V. Bocci, Eryk Czerwiński, Marek Jacewicz, I. Sarra, J. Lee-Franzini, I. Balwierz, G. Capon, O. Erriquez, Antonio Budano, A. Passeri, R. Versaci, Michał Silarski, F. Archilli, F. Happacher, Stefania Antonia Stucci, E. De Lucia, Tord Johansson, G. Giardina, D. Moricciani, S. Miscetti, Li Caldeira Balkeståhl, F. Nguyen, Magnus Wolke, P. Gauzzi, V. Kulikov, F. Loddo, Gianfranco Morello, F. Gonnella, E. Dané, P. Branchini, C. Di Donato, M. Mascolo, Paweł Moskal, M. Martemianov, P. Santangelo, Pierluigi Campana, W. Wislicki, A. De Santis, G. Fanizzi, Archilli, F, Ceradini, Filippo, and PRADO LONGHI, Ivan

Subjects
Dark forces, Nuclear and High Energy Physics, Particle physics, Meson, Electron–positron annihilation, e+e− collisions, Hadron, Elementary particle, $e ^{+} e^{−}$ collisions, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, 0103 physical sciences, gauge vector boson, 010306 general physics, Boson, Physics, Gauge boson, 010308 nuclear & particles physics, Phi meson, 3. Good health, dark forces, Physics::Accelerator Physics, e+e- collisions, High Energy Physics::Experiment, Gauge vector boson, Lepton
Abstract

The existence of a light dark force mediator has been tested with the KLOE detector at DAPHNE. This particle, called U, is searched for using the decay chain phi-->etaU, eta-->pi+pi-pi0, U-->e+e-. No evidence is found in 1.5 fb-1 of data. The resulting exclusion plot covers the mass range 5, Comment: 13 pages, 8 figures

Published
2012
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42. Observation of J/ψ-pair production in pp collisions at s=7 TeV

Author

M. Schmelling, M. Nicol, J. Garofoli, Ph. Charpentier, R. Schwemmer, J. Imong, M. Pappagallo, Jonas Rademacker, Stephen M. Stahl, R. Lindner, I. Nasteva, C. Bauer, E. Lanciotti, V. Romanovsky, N. Neufeld, X. Cid Vidal, F. Muheim, M. Veltri, G. Haefeli, Yuehong Xie, A. Pazos Alvarez, Mark Whitehead, A. Jaeger, F. F. Jing, P. Morawski, Valery Pugatch, W. Bonivento, G. Passaleva, C. Barschel, L. Zhong, Peter Clarke, H. Voss, Tjeerd Ketel, G. Manca, O. Schneider, C. Haen, C. Adrover, M. Matveev, Zishuo Yang, M. Palutan, M. O. Bettler, V. V. Gligorov, A. Zhelezov, Gianni Penso, R. Nandakumar, F. Xing, J. Luisier, Mikhail Zavertyaev, R. Muresan, A. Cook, S. Oggero, G. Krocker, P. Jaton, M. Savrie, Karol Hennessy, V. Heijne, J. Garra Tico, J. M. Otalora Goicochea, Marco Adinolfi, V. Balagura, J. Keaveney, Themistocles Bowcock, G. Valenti, Giovanni Carboni, D. Dossett, Eduardo Rodrigues, Patrick Robbe, Y.N. Gao, M. Charles, Stephane T'Jampens, S. Playfer, V. Niess, B. B. Shao, D. Martinez Santos, M. Meissner, I. Videau, L. Shekhtman, G. Alkhazov, William Barter, Angelo Carbone, Jaap Velthuis, S. Perazzini, A. Dosil Suárez, O. Shevchenko, P. Owen, A. Petrolini, K. Kreplin, E. Teodorescu, A. Sparkes, Xavier Vilasis-Cardona, I. V. Machikhiliyan, Th. Bauer, J. P. Lees, E. Grauges, A. Martens, S. Stoica, M. Liles, Hugh Philip Skottowe, F. De Lorenzi, A. Pérez-Calero Yzquierdo, V. Iakovenko, Yu. Guz, M. Sapunov, P. De Simone, W. C. Zhang, F. Machefert, T. Britton, Marc S. Williams, B. Khanji, G. McGregor, S. Malde, Rajesh Kumar, J-C. Garnier, Laurence Carson, J. Benton, P. Sail, M. Frosini, C. Blanks, J. Dickens, M. Calvo Gomez, Guoming Liu, G. Corti, L. Garrido, F. Constantin, K. Holubyev, F. Teubert, J. Lefrançois, D. R. Johnson, M. Tobin, L. De Paula, F. Ferreira Rodrigues, S.I. Eidelman, M. Knecht, S. Ricciardi, S. Redford, Kurt Rinnert, J. Mylroie-Smith, Jibo He, Dmitry Golubkov, V. Shevchenko, C. Farinelli, W. Baldini, S. Farry, P. Schaack, R. Plackett, Carmelo D'Ambrosio, O. Steinkamp, C. R. Jones, E. Ben-Haim, R. Messi, C. Parkes, C. D. Patel, B. Spaan, J. Closier, A. Massafferri, A. Zvyagin, P. Szczypka, M. Musy, O. Callot, G. Fardell, A. Kozlinskiy, Christoph Frei, A. Bay, A. Dovbnya, R. M. D. Mamunur, D. van Eijk, Mariusz Witek, Victor Coco, Howard Gordon, F. Eisele, Marianna Fontana, H. V. Cliff, J. Nardulli, J. Wishahi, Gianluigi Casse, L. Del Buono, O. Yushchenko, J. A. Hernando Morata, S. Easo, D. S. Bailey, V. Gibson, Lars Eklund, Federico Alessio, F. Dupertuis, M. Seco, A. Martín Sánchez, L. Li Gioi, D. Voong, R. Le Gac, P. Alvarez Cartelle, Silvia Borghi, Illya Shapoval, M. Coombes, S. Furcas, B. Popovici, Ignacio Bediaga, J. Magnin, Ziad Ajaltouni, T. Ruf, R. Maerki, Sandra Amato, D. R. Ward, C. Bozzi, K. Senderowska, Roel Aaij, A. Borgia, K. Carvalho Akiba, Pavel Krokovny, M. Karacson, G. J. Rogers, K. Belous, J. van Leerdam, G. Raven, D. Decamp, A. Golutvin, A. Papanestis, F. Jansen, A. Bien, I. Raniuk, Pierluigi Campana, O. Maev, Tomasz Skwarnicki, E. Maurice, M. Needham, N. Tuning, A. A. Alves, V. Bocci, A. Grecu, R. J. Barlow, Robert Appleby, Marta Calvi, R. Harji, Patrick Koppenburg, E. Jans, Lei Zhang, J. J. Back, Bernardo Adeva, Ch. Elsasser, G. Lanfranchi, M.-N. Minard, A. Vorobyev, P. Hopchev, P. Seyfert, C. Deplano, J. Bressieux, P. Diniz Batista, E. Fanchini, B. Souza De Paula, S. Ogilvy, B. Gui, F. Fontanelli, F. Soomro, M. M. Reid, T. du Pree, S. A. Wotton, A. Bates, G. D. Lafferty, Sebastian Bachmann, B. Pie Valls, V. Obraztsov, M. Deissenroth, A. Powell, Johannes Albrecht, A. A. Affolder, Malcolm John, D. Pinci, T. Brambach, C. Linn, M. Gandelman, F. Kruse, U. Kerzel, T. E. Latham, B. Maynard, M. Perrin-Terrin, B. Rakotomiaramanana, C. Goebel, M. T. Tran, A. Shires, R. Dzhelyadin, A. Lai, G. Polok, Krzysztof Grzegorz Sobczak, Sandro Cadeddu, G. Pessina, B. Viaud, R. Santinelli, V. Fave, Rudolf Oldeman, M. Pepe Altarelli, V. Egorychev, I. Mous, Pavel Shatalov, Z. Mathe, Christine Mclean, C. Thomas, D. Lambert, Stephan Eisenhardt, M. S. Rangel, R. Vazquez Gomez, Marco Gersabeck, G. Conti, R. Currie, S. Hansmann-Menzemer, A. Schopper, R. Mountain, J. Anderson, N. Sagidova, David D'Enterria, N. A. Smith, E. van Herwijnen, R. Ekelhof, E. Gushchin, T. Lesiak, A. Satta, Ulrik Egede, M. Szczekowski, D. Hynds, M. Grabalosa Gándara, D. Wiedner, A. D. Webber, N. Gauvin, S. De Capua, D. A. Roa Romero, A. Gallas Torreira, C. J. Parkinson, E. Thomas, E. Perez Trigo, D. Galli, Marina Artuso, D. L. Perego, A. C. Smith, T. M. Karbach, C. Satriano, F. Maciuc, L. Wiggers, F. F. Wilson, I. Burducea, B. Muryn, W. Witzeling, Nikolay Nikitin, L. Esteve, G. Auriemma, A. Contu, A. Semennikov, D. Brett, F. J. P. Soler, L. Kravchuk, Alessandro Cardini, J. M. De Miranda, Olivier Leroy, E. G. Zverev, Tara Shears, Anton Poluektov, A. Gomes, H. Degaudenzi, J. Palacios, Roger Forty, L. A. Granado Cardoso, K. Ciba, Yejin Zhang, S. C. Haines, Nikolay Bondar, Bo Liu, A. Keune, E. Santovetti, D. Lacarrere, M. Lieng, M. Nedos, A. Vollhardt, Alexander Leflat, A. C. dos Reis, P. Perret, Elie Aslanides, O. Okhrimenko, S. Topp-Joergensen, Ph. Ghez, A. Sciubba, Ivan Belyaev, N. H. Brook, C. Langenbruch, O. Aquines Gutierrez, Sergey Barsuk, P. Urquijo, Michael Alexander, H. Ruiz, Albert Bursche, S. Roiser, G. Martellotti, A. Solomin, Hans Dijkstra, A. Artamonov, M. Kucharczyk, D. A. Milanes, T. Gys, C. Matteuzzi, Yongsun Kim, Nicola Serra, M. Orlandea, H. Brown, S. Gregson, K. Wacker, Alessio Sarti, V. Vagnoni, J. Marks, M. Straticiuc, G. Wilkinson, M. Deckenhoff, B. Storaci, C. Gaspar, D. Moran, Jing Wang, G. Sabatino, A. Mazurov, A.E. Bondar, F. Stagni, R. S. Huston, Roland Bernet, W. D. Hulsbergen, T. Pilar, G. A. Cowan, S. Wandernoth, S. Koblitz, D. Esperante Pereira, J. J. Saborido Silva, U. Marconi, V. Fernandez Albor, P. Rodriguez Perez, E. Lopez Asamar, G. Mancinelli, Conor Fitzpatrick, J. H. Lopes, Jan Buytaert, P. M. Bjørnstad, Mario Sannino, S. Benson, J. van Tilburg, D. Websdale, S. Blusk, G. N. Patrick, J. Panman, Timothy Gershon, M. Plo Casasus, K. Kruzelecki, Thomas Blake, Alessandro Camboni, Philip Ilten, W. Qian, S. Nies, J. Harrison, R. W. Lambert, P. David, V. N. La Thi, A. Tsaregorodtsev, Michal Kreps, B. Jost, Chung Nguyen-Mau, C. Coca, Roberta Cardinale, M. Benayoun, Sheldon Stone, M. Shapkin, Ross D. Young, Y. Shcheglov, Paolo Gandini, J. Merkel, M. De Cian, T. Kvaratskheliya, S. Swientek, A. Buechler-Germann, J. Blouw, M. van Beuzekom, Tomasz Szumlak, T. Huse, C. Patrignani, Andrea Bizzeti, S. Miglioranzi, V. Tisserand, G. Ciezarek, R. Jacobsson, S. Schleich, David Hutchcroft, Francesco Dettori, S. Donleavy, C. Eames, Werner Hofmann, A. Falabella, Biagio Saitta, J. Visniakov, I. De Bonis, Marco Clemencic, P. Henrard, F. Blanc, R. Lefèvre, G. Graziani, P. Vazquez Regueiro, Dmitry Popov, Marco Cattaneo, K. Wyllie, B. Pietrzyk, M. Jahjah Hussein, M. Merk, N. Chiapolini, I. Sepp, J. F. J. van den Brand, A. Novoselov, S. Kukulak, B. Schmidt, Simone Bifani, A. Bobrov, S. Filippov, D. Savrina, L. Arrabito, A. Petrella, L. Martin, Nicholas Adam Styles, P. Spradlin, M. Ferro-Luzzi, J. Prisciandaro, R. Santacesaria, S. K. Paterson, Julien Cogan, M. P. Williams, Agnieszka Oblakowska-Mucha, C. Pavel-Nicorescu, S. Brisbane, J. Rouvinet, R. McNulty, M. Britsch, K. Vervink, E. Hicks, S. Monteil, T. Hampson, S. Vecchi, Li Li, Manuel Schiller, B. K. Pal, K. Mueller, Yasmine Amhis, P. Hunt, P. Collins, C. Faerber, M. H. Schune, S. Kandybei, C. Salzmann, U. Uwer, R. Graciani Diaz, Neville Harnew, Markus Frank, B. Jean-Marie, C. Potterat, B. D'Almagne, N. Mangiafave, A. Ukleja, Antonio Pellegrino, M. Patel, E. Polycarpo, Tatsuya Nakada, G. Bencivenni, J. M. Caicedo Carvajal, U. Straumann, Olivier Deschamps, Flavio Archilli, R. Silva Coutinho, N. Lopez-March, V. K. Subbiah, J. Serrano, Paul Fraser Harrison, A. Puig Navarro, and P. Naik

Subjects
Physics, Nuclear and High Energy Physics, Range (particle radiation), Particle physics, Luminosity (scattering theory), Large Hadron Collider, Meson production, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, 01 natural sciences, Nuclear physics, Pair production, 0103 physical sciences, Physics::Accelerator Physics, High Energy Physics::Experiment, Rapidity, Production (computer science), Nuclear Experiment, 010306 general physics, Energy (signal processing)
Abstract

The production of $J/\psi$ pairs in proton-proton collisions at a centre-of-mass energy of 7 TeV has been observed using an integrated luminosity of $37.5 pb^{-1}$ collected with the LHCb detector. The production cross-section for pairs with both \jpsi in the rapidity range $2

Published
2012
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43. Detection of pseudoscalar and scalar mesons at DAfNE with KLOE

Author

S. Giovannella, M. Adinolfi, A. Aloisio, F. Ambrosino, A. Andryakov, A. Antonelli, C. Bacci, A. Bankamp, G. Barbiellini, G. Bencivenni, S. Bertolucci, C. Bini, C. Bloise, V. Bocci, F. Bossi, P. Branchini, G. Cabibbo, R. Caloi, P. Campana, G. Capon, G. Carboni, A. Cardini, G. Cataldi, F. Ceradini, F. Cervelli, F. Cevenini, G. Chiefari, P. Ciambrone, S. Conticelli, E. De Lucia, G. De Robertis, P. De Simone, G. De Zorzi, S. Dell'Agnello, A. Denig, A. Di Domenico, S. Di Falco, A. Doria, E. Drago, O. Erriquez, A. Farilla, G. Felici, A. Ferrari, M.L. Ferrer, G. Finocchiaro, C. Forti, G. Foti, A. Franceschi, P. Franzini, M.L. Gao, P. Gauzzi, V. Golovatyuk, E. Gorini, F. Grancagnolo, E. Graziani, P. Guarnaccia, X. Huang, M. Incagli, L. Ingrosso, Y.Y. Jiang, W. Kim, W. Kluge, V. Kulikov, F. Lacava, G. Lanfranchi, J. Lee-Franzini, T. Lomtadze, C. Luisi, C.S. Mao, A. Martini, W. Mei, L. Merola, R. Messi, S. Miscetti, S. Moccia, M. Moulson, S. Mueller, F. Murtas, M. Napolitano, A. Nedosekin, M. Panareo, L. Pacciani, P. Pagès, M. Palutan, L. Paoluzi, E. Pasqualucci, L. Passalacqua, A. Passeri, V. Patera, E. Petrolo, D. Picca, G. Pirozzi, L. Pontecorvo, M. Primavera, F. Ruggieri, P. Santangelo, E. Santovetti, G. Saracino, R.D. Schamberger, B. Sciascia, A. Sciubba, F. Scuri, I. Sfiligoi, T. Spadaro, E. Spiriti, C. Stanescu, L. Tortora, P. Valente, G. Venanzoni, S. Veneziano, Y. Wu, S., Giovannella, M., Adinolfi, A., Aloisio, F., Ambrosino, A., Andryakov, A., Antonelli, C., Bacci, A., Bankamp, G., Barbiellini, G., Bencivenni, S., Bertolucci, C., Bini, C., Bloise, V., Bocci, F., Bossi, P., Branchini, G., Cabibbo, R., Caloi, P., Campana, G., Capon, G., Carboni, A., Cardini, G., Cataldi, F., Ceradini, F., Cervelli, F., Cevenini, G., Chiefari, P., Ciambrone, S., Conticelli, E., DE LUCIA, G., DE ROBERTIS, P., DE SIMONE, G., DE ZORZI, S., Dell'Agnello, A., Denig, A., DI DOMENICO, S., DI FALCO, A., Doria, E., Drago, O., Erriquez, A., Farilla, G., Felici, A., Ferrari, M. L., Ferrer, G., Finocchiaro, C., Forti, G., Foti, A., Franceschi, P., Franzini, M. L., Gao, P., Gauzzi, V., Golovatyuk, Gorini, Edoardo, F., Grancagnolo, E., Graziani, P., Guarnaccia, X., Huang, M., Incagli, L., Ingrosso, Y. Y., Jiang, W., Kim, W., Kluge, V., Kulikov, F., Lacava, G., Lanfranchi, J., LEE FRANZINI, T., Lomtadze, C., Luisi, C. S., Mao, A., Martini, W., Mei, L., Merola, R., Messi, S., Miscetti, S., Moccia, M., Moulson, S., Mueller, F., Murta, M., Napolitano, A., Nedosekin, Panareo, Marco, L., Pacciani, P., Pagè, M., Palutan, L., Paoluzi, E., Pasqualucci, L., Passalacqua, A., Passeri, V., Patera, E., Petrolo, D., Picca, G., Pirozzi, L., Pontecorvo, Primavera, Margherita, F., Ruggieri, P., Santangelo, E., Santovetti, G., Saracino, R. D., Schamberger, B., Sciascia, A., Sciubba, F., Scuri, I., Sfiligoi, T., Spadaro, E., Spiriti, C., Stanescu, L., Tortora, P., Valente, G., Venanzoni, and S. VENEZIANO AND Y., Wu

Subjects
Pseudoscalar, Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Meson, Radiative transfer, DAFNE, Event reconstruction
Abstract

Codice SCOPUS: 2-s2.0-0034738246 Codice ISI non disponibile The KLOE experiment at the DAfNE f-factory has just started collecting data. One of the first analysis items is the study of the f radiative decays, which allows us to investigate the nature of light pseudoscalar and scalar mesons. An integrated luminosity of 100 pb−1 is expected for next KLOE run, resulting in 3 × 108 f collected. A detailed simulation and full event reconstruction of both signal and background events indicates a sensitivity reach of 1 ÷ 2% on the branching ratios. Some preliminary studies on real data are also presented, showing a good agreement with MonteCarlo distributions

Published
2000
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44. First observation of the decay B¯s0→D0K⁎0 and a measurement of the ratio of branching fractions B(B¯s0→D0K⁎0)B(B¯0→D0ρ0)

Author

T. Britton, B. Khanji, A. Cook, S. Oggero, O. Maev, Tomasz Skwarnicki, Sebastian Bachmann, O. Callot, Yury Guz, R. Schwemmer, M. Matveev, J. Imong, S. Playfer, P. Naik, B. Pie Valls, G. Alkhazov, M. Patel, M. Shapkin, F. De Lorenzi, A. Pérez-Calero Yzquierdo, Y. Shcheglov, G. Fardell, Marie Helene Schune, A. C. Smith, J. Garofoli, C. Farinelli, G. Krocker, Stephan Eisenhardt, A. Bay, J. van Leerdam, G. Raven, D. Decamp, A. Golutvin, R. Harji, T. Kvaratskheliya, R. Lindner, I. Nasteva, C. Bauer, K. Wyllie, B. Pietrzyk, W. C. Zhang, E. Lanciotti, M. Merk, A. Palano, Tomasz Szumlak, A. Kozlinskiy, Yuehong Xie, C Barsche, A. Pazos Alvarez, Mark Whitehead, A. Dovbnya, J. Magnin, C. Blanks, J. Dickens, M. Calvo Gomez, Romanovsky, Marianna Fontana, Guoming Liu, L. Shekhtman, Francesco Dettori, A. Dosil Suárez, Silvia Borghi, N. Gauvin, Carmelo D'Ambrosio, N. Chiapolini, M. Schmelling, Jonas Rademacker, G. Ciezarek, F. J. P. Soler, R. Jacobsson, Pavel Krokovny, M. Karacson, A. Bobrov, G. Corti, F. Maciuc, S. Vecchi, T. Ruf, M. Frosini, H. Degaudenzi, M. Nicol, L. Arrabito, S. C. Haines, Stephen M. Stahl, L. Li, N. Neufeld, A. Petrella, D. Wiedner, A. D. Webber, K. Mueller, M.-N. Minard, D. Lacarrere, M. Lieng, G. J. Rogers, I. Sepp, X. Cid Vidal, G. Lanfranchi, A. Vorobyev, L. Del Buono, S. Schleich, David Hutchcroft, P. Jaton, F. Muheim, Philippe Ghez, Giovanni Carboni, Howard Gordon, F. Eisele, L. Gioi, J. Nardulli, A. Falabella, Biagio Saitta, M. Tobin, M. Pappagallo, U. Straumann, J. Wishahi, L. Garrido, H. V. Cliff, C. Matteuzzi, F. Domingo Bonal, Olivier Deschamps, Werner Hofmann, Yasmine Amhis, L. Martin, K. Kreplin, P. Spradlin, Z. Xing, William Barter, J. Prisciandaro, M. Liles, Lars Eklund, Balagura, Angelo Carbone, Jaap Velthuis, P. De Simone, Flavio Archilli, G. Manca, M. Veltri, G. Haefeli, O. Schneider, I. Raniuk, A. Grecu, Roland Bernet, E. Picatoste Olloqui, T. Pilar, J. Visniakov, Rajesh Kumar, S. Wandernoth, J. J. Back, F. Fontanelli, AM Sanchez, D. S. Bailey, C. Bozzi, K. Senderowska, R. Santacesaria, S. Easo, Ch. Elsasser, F. Jansen, Bernardo Adeva, B. Spaan, M. Deissenroth, M. T. Tran, J. Closier, A. Massafferri, R. Silva Coutinho, N. Lopez-March, Ziad Ajaltouni, K. Pal, Fave, Karol Hennessy, M. Charles, Laurence Carson, A. Powell, B. Rakotomiaramanana, B. B. Shao, M. Meissner, U Kerze, Christopher Parkes, C. Deplano, Darya Savrina, Nikolay Bondar, M. Sapunov, S. Malde, M. Coombes, C. Faerber, U. Uwer, Egorychev, S. A. Wotton, Julien Cogan, A. Papanestis, I. De Bonis, S. Filippov, Rudolf Oldeman, D. L. Perego, J. A. Hernando Morata, G. Polok, S. Brisbane, S. Furcas, I. Videau, Mikhail Zavertyaev, Themistocles Bowcock, A. Jaeger, O. Okhrimenko, A. Bates, R. Maerki, R. J. Barlow, G. D. Lafferty, Roel Aaij, V. K. Subbiah, Marta Calvi, M. Perrin-Terrin, Fernandez Albor, I. Mous, B. Popovici, A. Gallas Torreira, J. H. Lopes, Ignacio Bediaga, Niess, A. Sciubba, J. Serrano, J. Rouvinet, R. McNulty, F. Soomro, F. Dupertuis, P. Alvarez Cartelle, F. F. Jing, Patrick Robbe, T. du Pree, Elie Aslanides, C. Langenbruch, Krzysztof Grzegorz Sobczak, M. Ferro-Luzzi, E. Fanchini, Paul Fraser Harrison, S. Blusk, Tara Shears, A. Shires, Robert Appleby, Alessandro Camboni, A. Borgia, Kazuyoshi Carvalho Akiba, G. Pessina, Bo Liu, B. Storaci, P. Morawski, W. Bonivento, W. Qian, C. Gaspar, Jing Wang, Sandra Amato, A. Bondar, Iakovenko, A. Zhelezov, A. Mazurov, Stephane T'Jampens, J. Marks, K. Belous, M. Straticiuc, Bocci, Roger Forty, G. A. Cowan, A. Puig Navarro, B. Schmidt, Anton Poluektov, M. M. Reid, B. Viaud, G. Conti, N. Torr, E. Teodorescu, S. Stoica, P. M. Bjørnstad, Ivan Belyaev, Rmd Mamunur, Marco Gersabeck, G. Wilkinson, Machikhiliyan, A. Artamonov, Timothy Gershon, L. Zhong, Kurt Rinnert, P. Hopchev, D. Voong, R. Campana, A. Keune, S. K. Paterson, R. Le Gac, Alexander Leflat, N. Sagidova, Albert Bursche, Yongsun Kim, R. Currie, J. P. Lees, S. Hansmann-Menzemer, E. S. Smith, Nicola Serra, Thomas Blake, A. Schopper, J. M. Otalora Goicochea, H. Brown, A. Petrolini, P. Diniz Batista, G. McGregor, F Alessi, C. Linn, OA Gutierrez, M. Witek, D. Moran, C. J. Parkinson, J. Panman, R. Mountain, J. van Tilburg, Chung Nguyen-Mau, M. Szczekowski, G. Passaleva, F. Xing, J. Luisier, H. Voss, G. D. Patel, M. van Beuzekom, T. Huse, S. Roiser, G. Sabatino, F. Stagni, R. S. Huston, J. Mylroie-Smith, J. Harrison, Jibo He, D. Esperante Pereira, J. Benton, M. Needham, Barbara Sciascia, Nicholas Adam Styles, A. Comerma-Montells, Jmc Carvajal, Michal Kreps, T. M. Karbach, K. Wacker, B. Jost, C. Coca, Alessio Sarti, T. Lesiak, Tjeerd Ketel, Hugh Philip Skottowe, Philip Ilten, P. Sail, Markus Frank, U. Marconi, Johannes Albrecht, Malcolm John, Pel Clarke, M. Benayoun, M. Gandelman, R. Santinelli, C. Haen, Eduardo Rodrigues, Illya Shapoval, E. Greening, B. Souza De Paula, Tisserand, S. Nies, Jan Buytaert, F. Ferreira Rodrigues, E. Thomas, M. Plo Casasus, A. Semennikov, D. Brett, Ross D. Young, S. Monteil, R. W. Lambert, S. De Capua, M. Savrie, E. Gushchin, E. Lopez Asamar, R. Nandakumar, G. Mancinelli, Conor Fitzpatrick, Roberta Cardinale, K. Holubyev, R Seyfert, J. Keaveney, B. Muryn, S. Donleavy, F. Teubert, M. P. Williams, Agnieszka Oblakowska-Mucha, R. Plackett, J. Lefrançois, F. Kruse, R. Muresan, Monica Pepe Altarelli, Andrei Nomerotski, M. De Cian, A. Zvyagin, P. Szczypka, Paolo Gandini, Obraztsov, C. Pavel-Nicorescu, Patrick Koppenburg, Lei Zhang, D. Dossett, E. Grauges, L. Kravchuk, J. Merkel, Alessandro Cardini, Marwa Jahjah Hussein, Y.N. Gao, M. Musy, J. M. De Miranda, Marco Clemencic, M. Rosello, Pavel Shatalov, A. Buechler-Germann, J. Blouw, Mario Sannino, Nikolay Nikitin, A. Satta, F. Machefert, E. Perez Trigo, B. Jean-Marie, S. Perazzini, Vagnoni, Andrea Bizzeti, S. Miglioranzi, W. Baldini, K. Vervink, A. A. Affolder, Ulrik Egede, Sandro Cadeddu, Xavier Vilasis-Cardona, J. Anderson, David D'Enterria, S. Swientek, Lag Cardoso, Marc S. Williams, Manuel Schiller, C. Patrignani, S. Ogilvy, B. Gui, Jordi Garra Tico, S. Gregson, E. Hicks, Heijne, Marco Adinolfi, C. Adrover, E. Santovetti, M. Grabalosa Gándara, B. Maynard, C. Satriano, J-C. Garnier, Diego Martinez Santos, C Abelian Beteta, Zishuo Yang, K. Kruzelecki, D. van Eijk, Pugatch, L. Esteve, G. Auriemma, A. Contu, S. Farry, O. Yushchenko, Gianluigi Casse, T. Hampson, M. Palutan, T. E. Latham, Olivier Leroy, E. G. Zverev, L. De Paula, A. Sparkes, M. Nedos, A. Vollhardt, J. Palacios, A. Martens, M. O. Bettler, L. Wiggers, F. F. Wilson, V. V. Gligorov, S. Topp-Joergensen, I. Burducea, A. Gomes, C. Potterat, B. D'Almagne, N. H. Brook, P. Urquijo, Michael Alexander, E. Jans, Gianni Penso, M. Kucharczyk, D. A. Milanes, T. Gys, Z. Mathe, Christine Mclean, Hans Dijkstra, R. Vazquez Gomez, S. Eidelman, M. Deckenhoff, R Schaack, A. Bien, N. Mangiafave, P. Henrard, A. A. Alves, K. Ciba, A. C. dos Reis, D. Websdale, P. Perret, F. Blanc, O. Steinkamp, Sergey Barsuk, H. Ruiz, A. Ukleja, M. Orlandea, S. Koblitz, C. Thomas, J. J. Saborido Silva, D. Lambert, R. Lefèvre, P. David, V. N. La Thi, A. Tsaregorodtsev, P. Rodriguez Perez, T. Brambach, R. Dzhelyadin, A. Lai, Antonio Pellegrino, G. Graziani, David Gascon, J. F. J. van den Brand, Sheldon Stone, S. Kukulak, P. Hunt, P. Vazquez Regueiro, Dmitry Popov, P. Collins, E. Polycarpo, Tatsuya Nakada, Simone Bifani, Marco Cattaneo, S. Kandybei, C. Salzmann, G. Bencivenni, R. Graciani Diaz, M. Knecht, Neville Harnew, M Britschl, Dmitry Golubkov, C. Goebel, R. Messi, Th. Bauer, Gibson, S. Ricciardi, S. Redford, Philippe Charpentier, Christoph Frei, F. Constantin, D. Pinci, M. Seco, E. Maurice, J. Bressieux, D. Hynds, D. Galli, Marina Artuso, W. Witzeling, G. Martellotti, A. Solomin, W. D. Hulsbergen, S. Benson, G. N. Patrick, G. Valenti, O. Shevchenko, P. Owen, Dar Romero, Ward, D. R. Johnson, C. R. Jones, E. Ben-Haim, N. Tuning, Y. Zhang, N. A. Smith, E. van Herwijnen, and R. Ekelhof

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Nuclear magnetic resonance, 010308 nuclear & particles physics, Branching fraction, 0103 physical sciences, CP violation, 010306 general physics, Branching (polymer chemistry), 01 natural sciences
Abstract

The first observation of the decay $\bar{B}^0_s \to D^0 K^{*0}$ using $pp$ data collected by the LHCb detector at a centre-of-mass energy of 7 TeV, corresponding to an integrated luminosity of 36 pb$^{-1}$, is reported. A signal of $34.4 \pm 6.8$ events is obtained and the absence of signal is rejected with a statistical significance of more than nine standard deviations. The $\bar{B}^0_s \to D^0 K^{*0}$ branching fraction is measured relative to that of $\bar{B}^0 \to D^0 \rho^0$: $\frac{{\cal B}(\bar{B}^0_s \to D^0 K^{*0})}{{\cal B}(\bar{B}^0 \to D^0 \rho^0)} = 1.48 \pm 0.34 \pm 0.15 \pm 0.12$, where the first uncertainty is statistical, the second systematic and the third is due to the uncertainty on the ratio of the $B^0$ and $B^0_s$ hadronisation fractions.

Published
2011
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45. Observation of the rare η→e+e−e+e− decay with the KLOE experiment

Author

E. De Lucia, R. Messi, Marco Schioppa, A. Di Domenico, Flavio Archilli, A. Ranieri, V. Bocci, Paweł Moskal, M. Martemianov, P. Massarotti, Vincenzo Patera, Andrzej Kupsc, C. Bloise, Stefan E. Müller, E. Iarocci, Barbara Sciascia, M. Martini, F. Ceradini, B. Di Micco, A. Sciubba, M. Napolitano, L. Tortora, Michał Silarski, P. De Simone, S. Meola, J. Lee-Franzini, P. Santangelo, G. Felici, O. Erriquez, D. Domenici, M. A. Matsyuk, Marek Jacewicz, I. Balwierz, Claudio Gatti, F. Bossi, I. Prado Longhi, Magnus Wolke, P. Gauzzi, F. Loddo, Gianfranco Morello, M. Moulson, A. De Santis, S. Miscetti, Simona Serena Bocchetta, S. A. Bulychjev, S. Giovannella, C. Di Donato, G. De Robertis, Antonio Budano, T. Spadaro, W. Wiślicki, D. Babusci, G. Venanzoni, G. Xu, R. Versaci, A. Denig, Pierluigi Campana, Davide Badoni, A. Passeri, P. Ciambrone, G. Bencivenni, G. De Zorzi, F. Ambrosino, T. Capussela, Massimo Antonelli, Eryk Czerwiński, I. Sarra, Cecilia Taccini, F. Happacher, Tord Johansson, A. Antonelli, S. Fiore, Bo Höistad, E. Graziani, P. Franzini, Cesare Bini, D. Moricciani, Jarosław Zdebik, E. Dané, G. Capon, M. Palutan, F. Gonnella, F. Nguyen, P. Branchini, M. Dreucci, G. Fanizzi, and V. V. Kulikov

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Branching fraction, Electron–positron annihilation, 0103 physical sciences, Radiation, 010306 general physics, 01 natural sciences
Abstract

We report the first observation of the rare η → e + e − e + e − ( γ ) decay based on 1.7 fb − 1 collected by the KLOE experiment at the DAΦNE ϕ-factory. The selection of the e + e − e + e − final state is fully inclusive of radiation. We have identified 362 ± 29 events resulting in a branching ratio of ( 2.4 ± 0.2 stat + bckg ± 0.1 syst ) × 10 − 5 .

Published
2011
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46. Search for the rare decays Bs0→μ+μ− and B0→μ+μ−

Author

R. Aaij, B. Adeva, M. Adinolfi, C. Adrover, A. Affolder, Z. Ajaltouni, J. Albrecht, F. Alessio, M. Alexander, P. Alvarez Cartelle, A.A. Alves, S. Amato, Y. Amhis, J. Amoraal, J. Anderson, R.B. Appleby, O. Aquines Gutierrez, L. Arrabito, M. Artuso, E. Aslanides, G. Auriemma, S. Bachmann, D.S. Bailey, V. Balagura, W. Baldini, R.J. Barlow, C. Barschel, S. Barsuk, A. Bates, C. Bauer, Th. Bauer, A. Bay, I. Bediaga, K. Belous, I. Belyaev, E. Ben-Haim, M. Benayoun, G. Bencivenni, R. Bernet, M.-O. Bettler, M. van Beuzekom, A. Bien, S. Bifani, A. Bizzeti, P.M. Bjørnstad, T. Blake, F. Blanc, C. Blanks, J. Blouw, S. Blusk, A. Bobrov, V. Bocci, A. Bondar, N. Bondar, W. Bonivento, S. Borghi, A. Borgia, E. Bos, T.J.V. Bowcock, C. Bozzi, T. Brambach, J. van den Brand, J. Bressieux, S. Brisbane, M. Britsch, T. Britton, N.H. Brook, H. Brown, A. Büchler-Germann, A. Bursche, J. Buytaert, S. Cadeddu, J.M. Caicedo Carvajal, O. Callot, M. Calvi, M. Calvo Gomez, A. Camboni, P. Campana, A. Carbone, G. Carboni, R. Cardinale, A. Cardini, L. Carson, K. Carvalho Akiba, G. Casse, M. Cattaneo, M. Charles, Ph. Charpentier, N. Chiapolini, X.Cid Vidal, P.J. Clark, P.E.L. Clarke, M. Clemencic, H.V. Cliff, J. Closier, C. Coca, V. Coco, J. Cogan, P. Collins, F. Constantin, G. Conti, A. Contu, M. Coombes, G. Corti, G.A. Cowan, R. Currie, B. DʼAlmagne, C. DʼAmbrosio, W. Da Silva, P. David, I. De Bonis, S. De Capua, M. De Cian, F. De Lorenzi, J.M. De Miranda, L. De Paula, P. De Simone, D. Decamp, H. Degaudenzi, M. Deissenroth, L. Del Buono, C. Deplano, O. Deschamps, F. Dettori, J. Dickens, H. Dijkstra, M. Dima, P. Diniz Batista, S. Donleavy, P. Dornan, D. Dossett, A. Dovbnya, F. Dupertuis, R. Dzhelyadin, C. Eames, S. Easo, U. Egede, V. Egorychev, S. Eidelman, D. van Eijk, F. Eisele, S. Eisenhardt, L. Eklund, Ch. Elsasser, D.G. dʼEnterria, D. Esperante Pereira, L. Estève, A. Falabella, E. Fanchini, C. Färber, G. Fardell, C. Farinelli, S. Farry, V. Fave, V. Fernandez Albor, M. Ferro-Luzzi, S. Filippov, C. Fitzpatrick, F. Fontanelli, R. Forty, M. Frank, C. Frei, M. Frosini, S. Furcas, A. Gallas Torreira, D. Galli, M. Gandelman, P. Gandini, Y. Gao, J.-C. Garnier, J. Garofoli, L. Garrido, C. Gaspar, N. Gauvin, M. Gersabeck, T. Gershon, Ph. Ghez, V. Gibson, V.V. Gligorov, C. Göbel, D. Golubkov, A. Golutvin, A. Gomes, H. Gordon, C. Gotti, M. Grabalosa Gándara, R. Graciani Diaz, L.A. Granado Cardoso, E. Graugés, G. Graziani, A. Grecu, S. Gregson, B. Gui, E. Gushchin, Yu. Guz, T. Gys, G. Haefeli, S.C. Haines, T. Hampson, S. Hansmann-Menzemer, R. Harji, N. Harnew, P.F. Harrison, J. He, K. Hennessy, P. Henrard, J.A. Hernando Morata, E. van Herwijnen, A. Hicheur, E. Hicks, W. Hofmann, K. Holubyev, P. Hopchev, W. Hulsbergen, P. Hunt, T. Huse, R.S. Huston, D. Hutchcroft, V. Iakovenko, P. Ilten, J. Imong, R. Jacobsson, M. Jahjah Hussein, E. Jans, F. Jansen, P. Jaton, B. Jean-Marie, F. Jing, M. John, D. Johnson, C.R. Jones, B. Jost, F. Kapusta, T.M. Karbach, J. Keaveney, U. Kerzel, T. Ketel, A. Keune, B. Khanji, Y.M. Kim, M. Knecht, S. Koblitz, A. Konoplyannikov, P. Koppenburg, A. Kozlinskiy, L. Kravchuk, G. Krocker, P. Krokovny, F. Kruse, K. Kruzelecki, M. Kucharczyk, S. Kukulak, R. Kumar, T. Kvaratskheliya, V.N. La Thi, D. Lacarrere, G. Lafferty, A. Lai, R.W. Lambert, G. Lanfranchi, C. Langenbruch, T. Latham, R. Le Gac, J. van Leerdam, J.-P. Lees, R. Lefèvre, A. Leflat, J. Lefrançois, O. Leroy, T. Lesiak, L. Li, Y.Y. Li, L.Li Gioi, M. Lieng, M. Liles, R. Lindner, C. Linn, B. Liu, G. Liu, J.H. Lopes, E. Lopez Asamar, N. Lopez-March, J. Luisier, B. Mʼcharek, F. Machefert, I.V. Machikhiliyan, F. Maciuc, O. Maev, J. Magnin, A. Maier, S. Malde, R.M.D. Mamunur, G. Manca, G. Mancinelli, N. Mangiafave, U. Marconi, R. Märki, J. Marks, G. Martellotti, A. Martens, L. Martin, A. Martín Sánchez, D. Martinez Santos, A. Massafferri, Z. Mathe, C. Matteuzzi, M. Matveev, V. Matveev, E. Maurice, B. Maynard, A. Mazurov, G. McGregor, R. McNulty, C. Mclean, M. Meissner, M. Merk, J. Merkel, M. Merkin, R. Messi, S. Miglioranzi, D.A. Milanes, M.-N. Minard, S. Monteil, D. Moran, P. Morawski, J.V. Morris, R. Mountain, I. Mous, F. Muheim, K. Müller, R. Muresan, F. Murtas, B. Muryn, M. Musy, J. Mylroie-Smith, P. Naik, T. Nakada, R. Nandakumar, J. Nardulli, M. Nedos, M. Needham, N. Neufeld, M. Nicol, S. Nies, V. Niess, N. Nikitin, A. Oblakowska-Mucha, V. Obraztsov, S. Oggero, O. Okhrimenko, R. Oldeman, M. Orlandea, A. Ostankov, B. Pal, J. Palacios, M. Palutan, J. Panman, A. Papanestis, M. Pappagallo, C. Parkes, C.J. Parkinson, G. Passaleva, G.D. Patel, M. Patel, S.K. Paterson, G.N. Patrick, C. Patrignani, C. Pavel-Nicorescu, A. Pazos Alvarez, A. Pellegrino, G. Penso, M. Pepe Altarelli, S. Perazzini, D.L. Perego, E. Perez Trigo, A. Pérez-Calero Yzquierdo, P. Perret, A. Petrella, A. Petrolini, B. Pie Valls, B. Pietrzyk, D. Pinci, R. Plackett, S. Playfer, M. Plo Casasus, G. Polok, A. Poluektov, E. Polycarpo, D. Popov, B. Popovici, C. Potterat, A. Powell, T. du Pree, V. Pugatch, A. Puig Navarro, W. Qian, J.H. Rademacker, B. Rakotomiaramanana, I. Raniuk, G. Raven, S. Redford, W. Reece, A.C. dos Reis, S. Ricciardi, K. Rinnert, D.A. Roa Romero, P. Robbe, E. Rodrigues, F. Rodrigues, C. Rodriguez Cobo, P. Rodriguez Perez, G.J. Rogers, V. Romanovsky, J. Rouvinet, T. Ruf, H. Ruiz, G. Sabatino, J.J. Saborido Silva, N. Sagidova, P. Sail, B. Saitta, C. Salzmann, A. Sambade Varela, M. Sannino, R. Santacesaria, R. Santinelli, E. Santovetti, M. Sapunov, A. Sarti, C. Satriano, A. Satta, M. Savrie, D. Savrina, P. Schaack, M. Schiller, S. Schleich, M. Schmelling, B. Schmidt, O. Schneider, A. Schopper, M.-H. Schune, R. Schwemmer, A. Sciubba, M. Seco, A. Semennikov, K. Senderowska, N. Serra, J. Serrano, B. Shao, M. Shapkin, I. Shapoval, P. Shatalov, Y. Shcheglov, T. Shears, L. Shekhtman, O. Shevchenko, V. Shevchenko, A. Shires, E. Simioni, H.P. Skottowe, T. Skwarnicki, A.C. Smith, K. Sobczak, F.J.P. Soler, A. Solomin, P. Somogy, F. Soomro, B. Souza De Paula, B. Spaan, A. Sparkes, E. Spiridenkov, P. Spradlin, F. Stagni, O. Steinkamp, O. Stenyakin, S. Stoica, S. Stone, B. Storaci, U. Straumann, N. Styles, M. Szczekowski, P. Szczypka, T. Szumlak, S. TʼJampens, V. Talanov, E. Teodorescu, F. Teubert, C. Thomas, E. Thomas, J. van Tilburg, V. Tisserand, M. Tobin, S. Topp-Joergensen, M.T. Tran, A. Tsaregorodtsev, N. Tuning, A. Ukleja, P. Urquijo, U. Uwer, V. Vagnoni, G. Valenti, R. Vazquez Gomez, P. Vazquez Regueiro, S. Vecchi, J.J. Velthuis, M. Veltri, K. Vervink, B. Viaud, I. Videau, X. Vilasis-Cardona, J. Visniakov, A. Vollhardt, D. Voong, A. Vorobyev, An. Vorobyev, H. Voss, K. Wacker, S. Wandernoth, J. Wang, D.R. Ward, A.D. Webber, M. Whitehead, D. Wiedner, L. Wiggers, G. Wilkinson, M.P. Williams, M. Williams, F.F. Wilson, J. Wishahi, M. Witek, W. Witzeling, S.A. Wotton, K. Wyllie, Y. Xie, F. Xing, Z. Yang, G. Ybeles Smit, R. Young, O. Yushchenko, M. Zavertyaev, L. Zhang, W.C. Zhang, Y. Zhang, A. Zhelezov, L. Zhong, and E. Zverev

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, 0103 physical sciences, 010306 general physics, 01 natural sciences
Published
2011
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47. First observation of Bs0→J/ψf0(980) decays

Author

F. Constantin, L. Li Gioi, D. Voong, R. Campana, P. Hunt, M. Seco, Yang Li, S. Easo, W. C. Zhang, C. Langenbruch, A. Martín Sánchez, E. Maurice, Yongsun Kim, Nicola Serra, B. Storaci, R. Le Gac, D. Moran, Carmelo D'Ambrosio, E. Bos, Oleg Stenyakin, P. M. Bjørnstad, P. Collins, Lei Zhang, U. Marconi, A. Borgia, E. Thomas, J. Bressieux, O. Callot, R. M. D. Mamunur, I. Shapoval, Thomas Blake, V. Gibson, J. Garofoli, M. van Beuzekom, T. Huse, M. Zavertiaev, G. Fardell, R. Lindner, C. Bauer, C. Salzmann, A. Powel, Sandro Cadeddu, David D'Enterria, N. Tuning, Yuehong Xie, B. Muryn, A. Pazos Alvarez, L. Kravchuk, Alessandro Cardini, J. M. De Miranda, E. Lopez Asamar, T. Ruf, Mark Whitehead, Silvia Borghi, Pavel Krokovny, A. Kozlinskiy, A. Dovbnya, D. L. Perego, M. Tobin, G. Lanfranchi, M.-N. Minard, G. Mancinelli, Conor Fitzpatrick, Marina Artuso, R. Schwemmer, G. J. Rogers, J. C. Gamier, D. S. Bailey, A. Vorobyev, M. Witek, Mario Sannino, R. Santacesaria, C. Bozzi, K. Senderowska, Krzysztof Grzegorz Sobczak, R. Graciani Diaz, S. Oggero, W. Witzeling, R. J. Barlow, L. Camilleri, H. Degaudenzi, J. Imong, K. Kruzelecki, X. Vilasis-Cardona, S. Playfer, F. De Lorenzi, A. Pérez-Calero Yzquierdo, Neville Harnew, S. Farry, V. Vagnoni, Marta Calvi, M. Nedos, A. Vollhardt, P. Urquijo, A. Sparkes, Gianluigi Casse, F. Soomro, A. Bates, G. D. Lafferty, M. Needham, F. Fontanelli, Julien Cogan, W. Reece, Colin Mclean, A. Martens, Adlène Hicheur, E. Perez Trigo, S. Perazzini, F. Jansen, Michael Alexander, V. N. La Thi, A. Tsaregorodtsev, V. Lakovenko, E. van Herwijnen, M. Deissenroth, Bo Liu, C. J. Parkinson, G. Martellotti, M. Jahjah Hussein, Ivan Belyaev, H. V. Cliff, Federico Alessio, C. Adrover, M. Matveev, C. Blanks, J. Dickens, B. Rakotomiaramanana, L. Del Buono, E. Jans, S. K. Paterson, A. Shires, Sheldon Stone, A. Solomin, T. M. Karbach, M. Calvo Gomez, Guoming Liu, S. Brisbane, H. Brown, E. Spiridenkov, S. Topp-Joergensen, T. Gys, F. Muheim, S. Fiippov, R. Vazquez Gomez, G. Valenti, M. T. Tran, A. Semennikov, Zishuo Yang, M. Palutan, Johannes Albrecht, M. O. Bettler, G. Conti, G. Corti, W. D. Hulsbergen, C. Deplano, Yejin Zhang, D. Esperante Pereira, O. Steinkamp, R. Currie, M. P. Williams, J. Rouvinet, J. J. Saborido Silva, P. Rodriguez Perez, V. V. Gligorov, B. Schmidt, V. Fernandez Albor, M. Veltri, G. Haefeli, O. Shevchenko, M. Britsch, S. Vandernoth, Malcolm John, M. Knecht, S. Gregson, G. Polok, S. Hansmann-Menzemer, Dmitry Golubkov, R. Messi, I. Mous, R. McNulty, S. Ricciardi, T. J. Gershon, A. Schopper, C. Barschel, D. Martinez Santos, H. Terrier, S. Redford, F. Kruse, S. Monteil, Elie Aslanides, E. Fanchini, Pavel Shatalov, P. Perret, Sergey Barsuk, Gianni Penso, M. Gandelman, R. Mountain, A. Satta, C. Goebe, Roger Forty, Christoph Frei, Marcin Kucharczyk, G. N. Patrick, A. Keune, E. Santovetti, J. P. Lees, H. Ruiz, M. Orlandea, D. A. Milanes, U. Kerzel, Ulrik Egede, Themistocles Bowcock, Albert Bursche, Li Li, Manuel Schiller, R. Santinelli, C. Satriano, T. Lesiak, K. Wyllie, S. Tlampens, D. R. Johnson, S. Koblitz, G. Sabatino, F. Stagni, T. E. Latham, Z. Mathe, L. Esteve, Nicholas Adam Styles, C. R. Jones, G. Auriemma, A. Contu, R. S. Huston, V. Bocci, Olivier Leroy, B. Pietrzyk, J. Palacios, Jan Buytaert, E. Ben-Haim, K. Elous, Angelo Carbone, Jaap Velthuis, M. Shapkin, Francesco Dettori, C. Thomas, Kurt Rinnert, D. Pinci, Valery Pugatch, M. Plo Casasus, M. Sapunov, F. F. Jing, V. Egorychev, M. Merk, V. Matveev, V. Faye, P. Szczypka, Y. Shcheglov, E. Gushchin, F. Kapusta, S. Malde, N. Chiapolini, J. F. J. van den Brand, B. De Souza Paula, R. Koppenburg, J. Mylroie-Smith, Jibo He, P. Morawski, W. Bonivento, P. Schaack, Biagio Saitta, M. Coombes, M. Musy, D. Galli, S. Kukulak, Simone Bifani, A. D. Webber, E. Verev, T. Kvaratskheliya, S. Furcas, S. Eidelman, I. Raniuk, J. Visniakov, I. De Bonis, A. Zhelezov, B. Popovici, G. Manca, D. Savrina, L. Arrabito, L. Zhong, F. Murtas, Tomasz Szumlak, Ignacio Bediaga, P. Henrard, D. van Eijk, S. A. Wotton, F. Blanc, A. Papanestis, Rudolf Oldeman, A. Gallas Torreira, O. Yushchenko, L. Martin, R. Lefèvre, R. Jacobsson, A P Ostankov, M. Adinolfi, H. Voss, P. Spradlin, S. Schleich, P. J. Clark, David Hutchcroft, G. Graziani, Nikolay Bondar, M. Ferro-Luzzi, A. A. Alves, P. Naik, P. Vazquez Regueiro, Dmitry Popov, O. Okhrimenko, Ph. Ghez, A. Sciubba, C. Eames, Werner Hofmann, Osvaldo Aquines, Marco Cattaneo, M. Schmelling, J. Marks, M. Nicol, Agnieszka Oblakowska-Mucha, C. Pavel-Nicorescu, M. Pappagallo, Ross D. Young, G. A. Cowan, G. Wilkinson, R. Alvarez Cartelle, R. Nandakumar, D. Dossett, J. Merkel, K. Vervink, E. Hicks, B. M'charek, T. Brambach, C. Iglesias Escudero, V. Romanovsky, T. Hampson, R. Dzhelyadin, A. Lai, M. Merkin, C. Patrignani, Marc S. Williams, A. Sambade Varela, V. Tisserand, A. C. Smith, B. K. Pal, A. Petrolini, W. Da Silva, L. De Paula, Philip Ilten, M. Frosini, Hugh Philip Skottowe, S. Nies, F. J. P. Soler, R. W. Lambert, Roberta Cardinale, S. C. Haines, K. Holubyev, F. Teubert, J. Lefrançois, D. Lacarrere, W. Baldini, M. Lieng, C. Matteuzzi, B. Gui, B. Maynard, Roland Bernet, L. Wiggers, F. F. Wilson, M.O. Dima, Th. S. Bauer, A. Gomes, L. A. Granado Cardoso, Markus Frank, N. H. Brook, R. Maerki, B. Jean-Marie, J. H. Lopes, Alexey Vorobyev, T. du Pree, S. Blusk, R. Gandini, Alessandro Camboni, W. Qian, M. Pepe Altarelli, C. Potterat, Marco Gersabeck, B. D'Almagne, N. Mangiafave, X. Cid Vida, D. Niedner, G. Passaleva, C. Gaspar, Jing Wang, A. Mazurov, F. Xing, J. Luisier, S. Vecchi, J. L. Fungueirino Pazos, M. De Cian, J. Panman, K. Mueller, Eduardo Rodrigues, V. Niess, Yasmine Amhis, E. Grauges, A. Buechler-Germann, J. Blouw, B. Jost, C. Coca, M. Benayoun, C. Faerber, M. H. Schune, U. Uwer, F. Machefert, Andrea Bizzeti, S. Miglioranzi, S. Donleavy, Marco Clemencic, A. Ukleja, Yu. Guz, Antonio Pellegrino, G. Krocker, C. Rodriguez Cobo, E. Polycarpo, Tatsuya Nakada, G. Bencivenni, P. De Simone, L. Shekhtman, K. Carvalho Akiba, B. Spaan, J. Closier, A. Petrella, Victor Coco, Robert Appleby, A. Massafferri, J. A. Hernando Morata, V. Talanov, A. Bobrov, Roel Aaij, G. V. Ybeles Smit, Anatoly Konoplyannikov, J. M. Caicedo Carvaja, T. Britton, B. Khanji, J. Amoraal, V. Shevchenko, C. Farinelli, A. Bay, J. van Leerdam, G. Raven, D. Decamp, A. Golutvin, R. Harji, D. A. Roa Romero, D. R. Ward, A. A. Affolder, J. Anderson, Jonas Rademacker, L. Garrido, M. Patel, N. Neufeld, M. Grabalosa Gándara, O. Schneider, A. C. dos Reisl, Karol Hennessy, M. Charles, B. B. Shao, M. Meissner, I. Videau, Hans Dijkstra, U. Straumann, F. Dupertuis, Olivier Deschamps, Sandra Amato, A. Bondar, Tara Shears, Tjeerd Ketel, Eduard Simioni, Anton Poluektov, P. Hopchev, J. Magnin, P. Diniz Batista, M. Savrie, C. Linn, J. Keaveney, Y.N. Gao, N. Lopez-March, Alexander Leflat, J. Serrano, Paul Fraser Harrison, A. Puig Navarro, R. Muresan, V. Balagura, A. Grecu, Bernardo Adeva, G. D. Patel, K. Wacker, Alessio Sarti, Ph. Charpentier, P. Jaton, P. Somogy, Giovanni Carboni, I. V. Machikhiliyan, M. Liles, Rajesh Kumar, Patrick Robbe, Laurence Carson, E. Teodorescu, S. Stoica, G. McGregor, P. Sail, F. Ferreira Rodrigues, G. Capon, P. David, J. V. Morris, O. Maev, Tomasz Skwarnicki, Sebastian Bachmann, B. Pie Valls, V. Obraztsov, Stephan Eisenhardt, N. Gauvin, S. De Capua, F. Maciuc, R. Plackett, C. Parkes, Howard Gordon, F. Eisele, J. Nardulli, J. Wishahi, M. Szczekowski, A. A. Maier, Nikolay Nikitin, J. van Tilburg, P. E. L. Clarke, D. Websdale, Lars Eklund, Ziad Ajaltouni, B. Viaud, and N. Sagidova

Subjects
Hadronic decay, Physics, S system, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Hadron, 01 natural sciences, Measure (mathematics), Angular distribution, 0103 physical sciences, CP violation, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics
Abstract

Using data collected with the LHCb detector in proton-proton collisions at a centre-of-mass energy of 7 TeV, the hadronic decay Bs -> J/psi f0(980) is observed. This CP eigenstate mode could be used to measure mixing-induced CP violation in the B_s system. Using a fit to the

Published
2011
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48. First observation of B¯s0→Ds2⁎+Xμ−ν¯ decays

Author

H. J. Hilke, Z. Guzik, Alexey Vorobyev, U. Kerzel, T. du Pree, F. Jansen, R. B. Appleby, C. Deplano, T. E. Latham, C. Langenbruch, B. Storaci, G. Polok, I. Mous, M. Pepe Altarelli, Christine Mclean, Marco Gersabeck, C. Thomas, A.E. Bondar, P. Naik, M. Jahjah Hussein, E. Bos, P. Ilten, X. Cid Vidal, K. Müller, W. C. Zhang, T. M. Karbach, J. Anderson, J. F. J. van den Brand, P. M. Bjørnstad, M.I. Williams, Y. Xie, S. Kukulak, Andrew Smith, M. Nicol, James Keaveney, Simone Bifani, A. Sparkes, E. Dané, L. Zhang, P. Jaton, W. Witzeling, C. Barschel, Gianluigi Casse, Thomas Blake, O. Callot, I. Shapoval, Nicholas Adam Styles, A. Srednicki, M. Pappagallo, B. X. Liu, G. Wilkinson, G. Passaleva, D. Pinci, J. Panman, D. L. Perego, C. Matteuzzi, M. Shapkin, Y. Shcheglov, T. Kvaratskheliya, C. Iglesias Escudero, A. Sambade Varela, Tomasz Szumlak, S. TʼJampens, F. Xing, J. Luisier, V. Romanovsky, R. Jacobsson, S. Schleich, J. van Tilburg, P. Somogy, A. Arefyev, C. Eames, Werner Hofmann, E. Jans, V. Gibson, M. Frosini, S. Nies, G. Fardell, R. W. Lambert, Mikhail Zavertyaev, Roberta Cardinale, A. Kozlinskiy, A. Dovbnya, M. De Cian, M. van Beuzekom, T. Huse, Yu. Guz, I. V. Machikhiliyan, T. Ruf, A. Leflat, V. Niess, O. Steinkamp, A. Petrolini, A. Nawrot, G. J. Rogers, T. Skwarnicki, M. Liles, J. Moscicki, P. De Simone, G. Martellotti, E. Grauges, A. Solomin, G. Lanfranchi, M.-N. Minard, A. Vorobyev, S. Eidelman, P. Henrard, F. Machefert, B. Spaan, D. Martinez Santos, F. Blanc, J. Magnin, S. Löchner, M. Adinolfi, A. Chlopik, S. Basiladze, Jonas Rademacker, A. Massafferri, R. Lefèvre, Anatoly Konoplyannikov, P. Hunt, J. A. Hernando Morata, C. Ilgner, J. Albrecht, V. Talanov, W. D. Hulsbergen, A. Saputi, F. F. Jing, P. Morawski, W. Bonivento, G. Graziani, F. Soomro, E. Fanchini, P. Perret, O. Aquines Gutierrez, Sergey Barsuk, Roger Forty, P. F. Harrison, Kurt Rinnert, A. Keune, H. V. Cliff, H. P. Skottowe, Federico Alessio, W. Cameron, G. Haefeli, P. N. Y. David, J. Wang, E. Pauna, L. Zhong, K. Holubyev, A. Bates, F. Kruse, H. Ruiz, M. Orlandea, N. Neufeld, P. Collins, C. Parkes, B. DʼAlmagne, Roel Aaij, G. V. Ybeles Smit, A. Papanestis, A. Grecu, H. Gong, P. Vazquez Regueiro, J. H. Lopes, Dmitry Popov, A. Bursche, A P Ostankov, F. Teubert, G. Sabatino, S. Ricciardi, S. Redford, Y. Zhang, T. Britton, C. Salzmann, G. N. Patrick, F. Stagni, J. Mylroie-Smith, R. S. Huston, J. Lefrançois, G. D. Lafferty, Marco Cattaneo, J. Serrano, S. Koblitz, W. Da Silva, A. A. Affolder, M. Alexander, Agnieszka Oblakowska-Mucha, F. J. P. Soler, Christoph Frei, P. Schaack, S. Blusk, Anton Poluektov, Jan Buytaert, Pavel Shatalov, R. Märki, J. Amoraal, M. Korolev, W. Baldini, M. Plo Casasus, Th. Bauer, V. Matveev, Silvia Miglioranzi, Alessandro Camboni, Patrick Robbe, H. Degaudenzi, J. He, F. Constantin, K. Vervink, M. T. Tran, R. Schwemmer, J. Imong, M. Knecht, G. Manca, A. Satta, O. Schneider, J. G. Cogan, S. C. Haines, A. Hicheur, V. Shevchenko, C. Farinelli, E. Teodorescu, S. Stoica, E. Hicks, D. Lacarrere, M. Lieng, S. K. Paterson, S. Easo, R. Graciani Diaz, M. Tobin, T. Hampson, D. A. Milanes, C. Blanks, Neville Harnew, Plamen Hristov Hopchev, J. Libby, Patrick Koppenburg, Geraldine Conti, J. Dickens, M. Calvo Gomez, I. Raniuk, Francesco Dettori, N. H. Brook, A. M. Smith, M. Seco, Dmitry Golubkov, P. Campana, A. Borgia, R. Messi, A. Martín Sánchez, A. Bay, M. Matveev, C. Pavel, Karol Hennessy, Guoming Liu, A. Bobrov, G. Corti, G. McGregor, B. B. Shao, Zishuo Yang, C. Gaspar, M. Meissner, I. Videau, G. D. Patel, K. Wacker, Eduard Simioni, M. Palutan, Alessio Sarti, P. Sail, B. Adeva, G. H. Gong, M. O. Bettler, V. V. Gligorov, V. Rusinov, E. Tarkovskiy, E. Santovetti, A. Vollhardt, F. Murtas, F. Muheim, Sandro Cadeddu, J. Bressieux, F. De Lorenzi, S. A. Wotton, Biagio Saitta, Roland Bernet, M. P. Williams, S. Wandernoth, J. van Leerdam, G. Raven, D. Decamp, A. Golutvin, B. K. Pal, Christopher John Parkinson, M. Veltri, A. Büchler-Germann, F. Ferreira Rodrigues, I. DʼAntone, R. Plackett, M. Britsch, Howard Gordon, F. Eisele, J. Nardulli, K. Carvalho Akiba, Ph. Charpentier, M. Schmelling, J. L. Fungueirino Pazos, C. Satriano, L. Esteve, G. Auriemma, J. Wishahi, B. Souza De Paula, D. Galli, A. Contu, J. Visniakov, R. Harji, D. S. Bailey, Paolo Ciambrone, T. J. Gershon, Marina Artuso, I. De Bonis, F. Lehner, Li Li, Manuel Schiller, E. G. Zverev, M. Szczekowski, S. Borghi, Rudolf Oldeman, R. Antunes Nobrega, A. Semennikov, J. Garofoli, A. Gallas Torreira, Valery Pugatch, Elie Aslanides, C. Adrover, J. V. Morris, Andrea Bizzeti, S. De Capua, G. Penso, J. Palacios, A. Zhelezov, O. Maev, Sebastian Bachmann, B. Gui, R. Lindner, Nikolay Nikitin, M. Nedos, C. Bauer, B. Pie Valls, N. Chiapolini, V. Obraztsov, Y. N. Gao, Thomas Schneider, Stephan Eisenhardt, P. Gavillet, G. Carboni, S. Oggero, P. J. Clark, O. Leroy, D. van Eijk, D. E. Hutchcroft, V. Bocci, B. Maynard, Stephane Monteil, S. Gregson, C. Pauna, W. Flegel, S. Playfer, A. Pazos Alvarez, N. Gauvin, Phillip Urquijo, Mark Whitehead, O. Yushchenko, F. Maciuc, M. Frank, A. Pérez-Calero Yzquierdo, L. Carson, P. E. L. Clarke, A. C. dos Reis, V. Iakovenko, R. Muresan, A. A. Alves, Lars Eklund, Ziad Ajaltouni, C. Bozzi, K. Senderowska, S. Filippov, W. Reece, Ross D. Young, J. Cheng, P. J. Dornan, J. Closier, M. Ferro-Luzzi, J. Merkel, T. Brambach, B. Khanji, R. Dzhelyadin, A. Lai, M. Merkin, C. Patrignani, V. Tisserand, Hans Dijkstra, H. Voss, L. Wiggers, V. Egorychev, L. Garrido, F. F. Wilson, A. Gomes, B. Viaud, P. Gandini, R. J. Barlow, N. Sagidova, Marta Calvi, F. Dupertuis, P. Alvarez Cartelle, L. A. Granado Cardoso, Sandra Amato, K. Belous, C. DʼAmbrosio, C. Linn, P. Neustroev, A. Mazurov, B. Schmidt, Ivan Belyaev, S. Pozzi, M. Grabalosa Gándara, H. Brown, B. Mʼcharek, B. Bochin, D. Esperante Pereira, V. Fernandez Albor, R. Santacesaria, M. J. Charles, T. J. V. Bowcock, D.G. dʼEnterria, B. Jost, C. Coca, M. Benayoun, A. Tsaregorodtsev, S. Brisbane, S. Vecchi, E. Spiridenkov, J. Rouvinet, S. Donleavy, R. McNulty, Marco Clemencic, P. Krokovny, H. Terrier, Yasmine Amhis, G. Krocker, Nigel Smale, K. Wyllie, B. Pietrzyk, L. Shekhtman, M. Merk, A. Petrella, Victor Coco, Yongsun Kim, Nicola Serra, M. H. Schune, D. Savrina, L. Arrabito, A. Puig Navarro, J. P. Lees, Vladislav Balagura, U. Uwer, D. A. Roa Romero, L. Martin, P. Spradlin, D. R. Ward, U. Marconi, R. Vazquez Gomez, E. Lopez Asamar, P. Szczypka, M. Musy, R. M. D. Mamunur, G. Mancinelli, J. Christiansen, Mario Sannino, S. Steiner, L. Camilleri, D. Websdale, F. Fontanelli, M. Deissenroth, K. Kruzelecki, A. Powell, Andreas Alexander Maier, A. Ukleja, Rahul Kumar, V. N. La Thi, D. Wiedner, A. D. Webber, Antonio Pellegrino, T. G. Shears, Nikolay Bondar, O. Okhrimenko, Ph. Ghez, A. Sciubba, C. Rodriguez Cobo, J. Marks, G. A. Cowan, L. Li Gioi, E. Polycarpo, D. Voong, R. Le Gac, G. Bencivenni, J. M. Caicedo Carvajal, M. Witek, W. Qian, M. Needham, F. Kapusta, S. Stone, M. Gandelman, R. Santinelli, V. Fave, Dermot Moran, E. Gushchin, R. Nandakumar, D. Dossett, S. Perazzini, G. Valenti, S. Farry, J-C. Garnier, O. Shevchenko, E. Rodrigues, J. Blouw, L. De Paula, B. Jean-Marie, C. Potterat, N. Mangiafave, D. R. Johnson, C. R. Jones, N. Tuning, M. Agari, M. J.J. John, N. Lopez-March, B. Rakotomiaramanana, E. van Herwijnen, M. Patel, U. Trunk, E. Perez Trigo, A. Kashchuk, Z. Mathe, U. Egede, S. Topp-Joergensen, M. Kucharczyk, T. Gys, U. Straumann, Olivier Deschamps, J. J. Saborido Silva, Tjeerd Ketel, P. Rodriguez Perez, M. Savrie, S. Traynor, Y.Y. Li, Oleg Stenyakin, A. Martens, Xavier Vilasis-Cardona, Angelo Carbone, Jaap Velthuis, C. Fitzpatrick, L. Del Buono, M. Sapunov, S. Malde, M. Coombes, S. Furcas, B. Popovici, Ignacio Bediaga, J. Gassner, E. Thomas, T. Nakada, C. Färber, B. Muryn, L. Kravchuk, Alessandro Cardini, J. M. De Miranda, C. Göbel, Krzysztof Grzegorz Sobczak, G. Pessina, V. Vagnoni, A. Shires, Emilie Maurice, R. Currie, S. Hansmann-Menzemer, A. Schopper, R. Mountain, T. Lesiak, M.O. Dima, and Ming Zeng

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, 0103 physical sciences, 010306 general physics, 01 natural sciences
Published
2011
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49. Measurement of σ(pp→bb¯X) at s=7 TeV in the forward region

Author

D. S. Bailey, C. Bozzi, K. Senderowska, Marta Calvi, F. Soomro, Bo Liu, S. Perazzini, Ivan Belyaev, S. Pozzi, H. Brown, B. Bochin, D. Esperante Pereira, V. Fernandez Albor, M. L. Woodward, S. Traynor, L. Garrido, G. Krocker, O. Callot, F. Kruse, Pavel Shatalov, A. Satta, Francesco Iacoangeli, Ulrik Egede, S. Basiladze, M. Alfonsi, C. Satriano, L. Esteve, G. Auriemma, A. Contu, F. Lehner, Olivier Leroy, E. G. Zverev, I. Shapoval, L. Shekhtman, J. Palacios, G. Fardell, S. Eidelman, Carmelo D'Ambrosio, Jaap Velthuis, M. Sapunov, E. Lopez Asamar, R. M. D. Mamunur, G. Moine, Conor Fitzpatrick, R. Santacesaria, S. Löchner, P. Henrard, F. Blanc, R. Lefèvre, Oleg Stenyakin, A. Kozlinskiy, A. Dovbnya, S. Malde, Victor Coco, A. Nawrot, D. Wiedner, A. D. Webber, R. Schwemmer, J. Imong, L. Del Buono, I. Kudryashov, N. Tuning, C. Pavel, E. Bonaccorsi, S. Ricciardi, S. Redford, Christoph Frei, J. Christiansen, A. Chlopik, Roger Forty, A. Keune, E. Santovetti, Mario Sannino, Albert Bursche, Silvia Borghi, G. Sabatino, Pavel Krokovny, H. J. Hilke, Z. Guzik, Patrick Koppenburg, Lei Zhang, Sandro Cadeddu, David D'Enterria, Stephen M. Stahl, M. Rosello, L. Li, N. Neufeld, D. L. Perego, G. J. Rogers, G. Graziani, David Gascon, C. Abellan Beteta, S. Steiner, Tjeerd Ketel, F. Constantin, C. Fournier, U. Kerzel, P. Morawski, W. Bonivento, F. Stagni, R. S. Huston, D. A. Roa Romero, P. Vazquez Regueiro, J. Magnin, Dmitry Popov, L. Camilleri, D. Websdale, X. Cid Vidal, F. Muheim, D. R. Ward, H. Degaudenzi, C. Blanks, J. Dickens, M. Calvo Gomez, Guoming Liu, A. Bobrov, G. Corti, Y. Zhang, M. Agari, T. J. V. Bowcock, K. Kruzelecki, T. E. Latham, Z. Mathe, Jan Buytaert, M. Plo Casasus, M. Coombes, S. Furcas, B. Popovici, Ignacio Bediaga, J. Gassner, Julien Cogan, C. Gaspar, A. Srednicki, M. Veltri, G. Haefeli, Jing Wang, A. Mazurov, Clive Barham, G. Manca, O. Schneider, R. Kristic, Marco Cattaneo, F. Fontanelli, M. Deissenroth, C. Thomas, Yu. Guz, V. Matveev, A. Powell, B. Rakotomiaramanana, S. Brisbane, J. F. J. van den Brand, F. Jansen, M. Savrie, F. Dupertuis, C. Göbel, Nikolay Bondar, A. Shires, A. Bates, G. D. Lafferty, C. Parkes, E. Pauna, Howard Gordon, F. Eisele, K. Wacker, E. Spiridenkov, M. Seco, P. Alvarez Cartelle, S. Kukulak, Krzysztof Grzegorz Sobczak, Simone Bifani, A P Ostankov, Anatoly Konoplyannikov, P. David, M. Nedos, A. Vollhardt, Marco Adinolfi, J. Panman, V. Gracco, P. Urquijo, Michael Alexander, W. Flegel, H. Voss, H. V. Cliff, Federico Alessio, G. Barber, J. Keaveney, E. Dané, G. Pessina, C. Deplano, Karol Hennessy, P. De Simone, Stephane T'Jampens, A. Comerma-Montells, O. Okhrimenko, Sandra Amato, A. Bondar, V. N. La Thi, A. Tsaregorodtsev, Matthew Needham, N. A. Smith, J. Nardulli, E. Maurice, G. Conti, J. Wishahi, J. Rouvinet, A. Grecu, Y.N. Gao, B. Jost, C. Coca, M. Benayoun, Ph. Ghez, A. Sciubba, K. Belous, M. Jahjah Hussein, Valery Pugatch, G. Polok, E. Perez Trigo, I. Mous, M. Charles, B. B. Shao, J. P. Lees, R. McNulty, Sheldon Stone, M. Korolev, R. Currie, H. Terrier, J. Bressieux, Yang Li, A. Sparkes, S. Easo, Colin Mclean, A. Martens, Adlène Hicheur, P. Hopchev, Bernardo Adeva, B. Schmidt, E. van Herwijnen, Giampiero Mancinelli, I. Videau, S. Donleavy, G. Valenti, B. Spaan, S. Hansmann-Menzemer, I. D'Antone, P. Campana, M. Szczekowski, T. Bellunato, A. Borgia, A. Schopper, J. Riera, V. Gibson, A. Zhelezov, Marco Clemencic, Nicholas Adam Styles, Simone Brusa, M. T. Tran, A. Büchler-Germann, A. A. Affolder, C. Linn, A. Papadelis, Nigel Smale, S. G. Katvars, D. Galli, J. Closier, Y. Bagaturia, A. Massafferri, Xavier Vilasis-Cardona, A. A. Maier, O. Steinkamp, L. Dwyer, T. Ruf, J. Anderson, S. Topp-Joergensen, K. Carvalho Akiba, Marina Artuso, P. Szczypka, M. Musy, B. Souza De Paula, K. Wyllie, B. Pietrzyk, J. A. Hernando Morata, W. Witzeling, M. Grabalosa Gándara, T. Lesiak, C. J. Parkinson, J. Libby, I. Raniuk, A. Petrolini, G. A. Cowan, M. P. Williams, Agnieszka Oblakowska-Mucha, A. Noor, T. Gys, Nikolay Nikitin, D. Piedigrossi, E. Tarkovskiy, Robert Appleby, T. M. Karbach, G. Wilkinson, Patrick Robbe, Hugh Philip Skottowe, F. Murtas, R. Nandakumar, G. Lanfranchi, M.-N. Minard, T. J. Gershon, A. Vorobyev, M. Patel, U. Trunk, R. Antunes Nobrega, A. Semennikov, M. Merk, J. J. Saborido Silva, Roel Aaij, G. V. Ybeles Smit, E. Thomas, J. van Tilburg, S. A. Wotton, A. Sambade Varela, K. Vervink, D. Dossett, A. Papanestis, Elie Aslanides, B. Chadaj, P. Rodriguez Perez, G. Martellotti, A. Solomin, C. Forti, Tariel Sakhelashvili, C. Färber, C. Langenbruch, K. Holubyev, Rudolf Oldeman, F. Teubert, P. E. L. Clarke, Marcin Kucharczyk, E. Hicks, Hans Dijkstra, A. Arefyev, J. Lefrançois, B. Storaci, B. Corajod, S. Poss, W. D. Hulsbergen, A. Kashchuk, D. Volyanskyy, B. M'charek, B. Muryn, E. Teodorescu, S. Stoica, L. Kravchuk, D. Savrina, L. Arrabito, Alessandro Cardini, J. M. De Miranda, E. Bos, A. Gallas Torreira, A. C. dos Reis, T. Hampson, R. Muresan, V. Tisserand, B. Khanji, V. Balagura, Lars Eklund, L. Brarda, M. Lenzi, D. R. Johnson, A. Petrella, L. Nicolas, W. Baldini, P. M. Bjørnstad, J. H. Lopes, C. R. Jones, Philip Ilten, Zishuo Yang, M. Palutan, M. Frosini, Kurt Rinnert, L. Martin, G. N. Patrick, Ziad Ajaltouni, M. O. Bettler, S. Nies, S. Gregson, P. Spradlin, Thomas Blake, Marc S. Williams, D. van Eijk, R. W. Lambert, B. K. Pal, R. Märki, J. Amoraal, Yongsun Kim, V. V. Gligorov, V. Rusinov, P. Loveridge, G. McGregor, Roberta Cardinale, Nicola Serra, O. Yushchenko, M. van Beuzekom, J. Mylroie-Smith, S. Blusk, A. Carbone, M. Shapkin, Gianni Penso, V. Vagnoni, J. Morant, J-C. Garnier, O. Jamet, T. Huse, Jibo He, P. Schaack, S. Sigurdsson, Y. Shcheglov, T. Kvaratskheliya, P. Sail, D. Moran, B. Viaud, A. A. Alves, N. Sagidova, Tomasz Szumlak, Alessandro Camboni, S. Oggero, J. Cheng, T. Brambach, S. Playfer, L. De Paula, O. Ullaland, R. Dzhelyadin, A. Lai, P.A. Cooke, F. Ferreira Rodrigues, M. Merkin, F. De Lorenzi, A. Pérez-Calero Yzquierdo, V. Iakovenko, U. Marconi, P. Naik, L. Li Gioi, R. Jacobsson, G. Felici, U. Straumann, W. Reece, D. Voong, Ph. Charpentier, R. Le Gac, S. Schleich, M. Poli-Lener, David Hutchcroft, R. Bernhard, R. Dumps, Olivier Deschamps, M. Knecht, J. Carroll, M. Witek, G. H. Gong, M. Schmelling, M. Nicol, B. Franek, G. Guerrer, L. Roy, T. Savidge, J. Rademacker, R. Lindner, Dmitry Golubkov, R. Messi, C. Bauer, F. Kapusta, C. Eames, J. L. Fungueirino Pazos, M. De Cian, Werner Hofmann, N. Lopez-March, C. Adrover, Johannes Albrecht, Thomas Schneider, P. Gavillet, Malcolm John, C. Iglesias Escudero, V. Romanovsky, M. Gandelman, R. Santinelli, V. Fave, Paolo Ciambrone, J. Blouw, Yuehong Xie, E. Gushchin, J. Serrano, V. Bocci, J. Marks, D. Martinez Santos, U. Uwer, A. Pazos Alvarez, J.H. Bibby, Paul Fraser Harrison, Andrea Bizzeti, S. Miglioranzi, B. Gui, D. Pinci, Mark Whitehead, A. Puig Navarro, B. Maynard, V. Egorychev, P. Neustroev, Roger Barlow, V. Shevchenko, C. Farinelli, G. Decreuse, L. Wiggers, F. F. Wilson, A. Bay, S. W. Lindsay, Th. S. Bauer, A. Gomes, L. A. Granado Cardoso, G. Raven, D. Decamp, A. Golutvin, N. H. Brook, R. Harji, N. Chiapolini, Sadia Khalil, G. Passaleva, F. Xing, J. Luisier, S. Filippov, M. Ferro-Luzzi, Eduardo Rodrigues, V. Niess, S. K. Paterson, E. Grauges, M. Britsch, S. Monteil, F. Machefert, W. Qian, C. Ilgner, Manuel Schiller, W. Cameron, H. Gong, A. C. Smith, F. J. P. Soler, R. Mountain, S. C. Haines, D. Lacarrere, M. Lieng, A. M. Smith, C. Matteuzzi, P. Hunt, Roland Bernet, E. Picatoste Olloqui, S. Wandernoth, M.O. Dima, P. Collins, Ming Zeng, C. Salzmann, R. Graciani Diaz, Neville Harnew, Alexey Vorobyev, T. du Pree, M. Pepe Altarelli, Marco Gersabeck, K. Müller, P. J. Clark, Ross D. Young, P. J. Dornan, Paolo Gandini, C. Patrignani, S. Farry, Gianluigi Casse, E. Rondan Sanabria, E. Jans, R. Vazquez Gomez, E. Fanchini, P. Perret, O. Aquines Gutierrez, Sergey Barsuk, H. Ruiz, M. Orlandea, S. Koblitz, Francesco Dettori, Biagio Saitta, J. Visniakov, I. De Bonis, M. Pappagallo, S. Vecchi, Yasmine Amhis, J. V. Morris, O. Maev, W. Da Silva, M. H. Schune, Tomasz Skwarnicki, Sebastian Bachmann, B. Pie Valls, A. Ukleja, V. Obraztsov, Stephan Eisenhardt, A. Gaspar De Valenzuela Cue, Antonio Pellegrino, C. Pauna, N. Gauvin, S. De Capua, C. Rodriguez Cobo, E. Polycarpo, Tatsuya Nakada, G. Bencivenni, J. M. Caicedo Carvajal, F. Maciuc, P. Jaton, P. Somogy, Giovanni Carboni, I. V. Machikhiliyan, J. Moscicki, Rajesh Kumar, Laurence Carson, C. J. Densham, Tara Shears, Markus Frank, Eduard Simioni, Anton Poluektov, Alexander Leflat, G. D. Patel, J. Merkel, Alessio Sarti, B. Jean-Marie, Christian Rummel, C. Potterat, B. D'Almagne, N. Mangiafave, and M. Tobin

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Muon, Meson, 010308 nuclear & particles physics, Nuclear Theory, High Energy Physics::Phenomenology, Hadron, Sigma, 01 natural sciences, 7. Clean energy, Bottom quark, Nuclear physics, Pseudorapidity, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics
Abstract

Decays of b hadrons into final states containing a D0 meson and a muon are used to measure the b anti-b production cross-section in proton-proton collisions at a centre-of-mass energy of 7 TeV at the LHC. In the pseudorapidity interval 2 < eta < 6 and integrated over all transverse momenta we find that the average cross-section to produce b-flavoured or anti-b-flavoured hadrons is (75.3 +/- 5.4 +/- 13.0) microbarns.

Published
2010
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50. Prompt KS0 production in pp collisions at s=0.9 TeV

Author

G. Mancinelli, Conor Fitzpatrick, F. Constantin, S. Traynor, J. H. Lopes, C. Langenbruch, B. Storaci, S. Eidelman, P. Henrard, Mario Sannino, F. Blanc, R. Lefèvre, F. Kruse, G. Graziani, David Gascon, C. Abellan Beteta, S. Steiner, P. Vazquez Regueiro, Dmitry Popov, R. Kristic, Marco Cattaneo, E. Bos, R. Nandakumar, M. Seco, S. Blusk, G. Wilkinson, Angelo Carbone, L. Camilleri, C. Matteuzzi, A. Sambade Varela, Alessandro Camboni, K. Kruzelecki, Themistocles Bowcock, D. van Eijk, P. Loveridge, P. M. Bjørnstad, E. Maurice, Jaap Velthuis, Pavel Shatalov, O. Yushchenko, D. Dossett, J. Bressieux, Thomas Blake, A. A. Affolder, M. Sapunov, A. Satta, J. V. Morris, O. Maev, W. Da Silva, A. Arefyev, R. Santacesaria, O. Callot, P. David, V. N. La Thi, A. Tsaregorodtsev, Tomasz Skwarnicki, Kurt Rinnert, S. Farry, Gianluigi Casse, Francesco Iacoangeli, Ulrik Egede, Sheldon Stone, G. H. Gong, J. Anderson, Sebastian Bachmann, M. van Beuzekom, T. Huse, G. Fardell, B. Pie Valls, V. Obraztsov, M. Grabalosa Gándara, M. Frosini, S. Nies, A. A. Alves, J. L. Fungueirino Pazos, M. De Cian, Stephan Eisenhardt, R. W. Lambert, Lars Eklund, Marina Artuso, J. Mylroie-Smith, Jibo He, E. Perez Trigo, S. Malde, A. Kozlinskiy, A. Dovbnya, Marc S. Williams, Julien Cogan, S. Sigurdsson, E. Rondan Sanabria, E. Jans, P. Schaack, Roberta Cardinale, M. Coombes, A. Gaspar De Valenzuela Cue, J. Cheng, T. Brambach, J-C. Garnier, H. V. Cliff, Federico Alessio, G. Barber, C. Pauna, H. J. Hilke, A. Nawrot, G. J. Rogers, D. Vieira, P. Naik, Z. Guzik, E. Bonaccorsi, Paolo Ciambrone, J. Blouw, N. Gauvin, S. De Capua, F. Maciuc, Tara Shears, F. Jansen, Eduard Simioni, Anton Poluektov, S. Brisbane, E. Spiridenkov, L. De Paula, G. Felici, M. Poli-Lener, A. Ukleja, O. Ullaland, R. Dzhelyadin, A. Lai, P.A. Cooke, S. Löchner, L. Esteve, M. Schmelling, L. Li Gioi, D. Voong, S. Furcas, B. Popovici, Ignacio Bediaga, J. Gassner, J. Magnin, Illya Shapoval, A. Chlopik, Simone Brusa, M. T. Tran, Patrick Koppenburg, Lei Zhang, M. Merkin, Yu.V. Gilitsky, Andrea Bizzeti, S. Miglioranzi, A. Srednicki, Jordi Riera, J. Rouvinet, R. McNulty, H. Terrier, A. Papadelis, M. Nicol, E. Dané, V. Gibson, A. Bates, W. Witzeling, Tariel Sakhelashvili, S. Topp-Joergensen, A. Van Lysebetten, C. Deplano, Yongsun Kim, Roger Forty, Yu. Guz, Alexander Leflat, H. Gong, A. C. Smith, Nigel Smale, Nicola Serra, G. Polok, I. Mous, T. Ruf, G. Auriemma, A. Contu, F. Lehner, Olivier Leroy, E. G. Zverev, J. Palacios, Bo Liu, A. Keune, E. Santovetti, M. Pappagallo, G. Martellotti, A. Solomin, C. Forti, D. Moran, W. D. Hulsbergen, Ivan Belyaev, K. Wyllie, S. Pozzi, B. Pietrzyk, R. Le Gac, M. Witek, Hans Dijkstra, G. Krocker, Sandro Cadeddu, David D'Enterria, L. Shekhtman, E. Pauna, U. Marconi, T. Gys, G. Lanfranchi, M.-N. Minard, B. Viaud, P. De Simone, B. Spaan, J. Closier, Albert Bursche, Antonio Pellegrino, C. Iglesias Escudero, V. Romanovsky, G. Guerrer, F. Kapusta, E. Thomas, G. Moine, C. Färber, G. Sabatino, J. A. Hernando Morata, N. Sagidova, G. D. Patel, K. Wacker, Alessio Sarti, M. Merk, R. Dumps, A. Grecu, R. Vazquez Gomez, E. Fanchini, P. Perret, O. Aquines Gutierrez, Sergey Barsuk, H. Ruiz, M. Orlandea, Clive Barham, S. Koblitz, Francesco Dettori, A. Vorobyev, D. Piedigrossi, H. Brown, M. Knecht, F. J. P. Soler, B. Muryn, Roel Aaij, G. V. Ybeles Smit, M. Shapkin, F. Stagni, R. S. Huston, Y. Shcheglov, Bernardo Adeva, L. Roy, T. Savidge, C. Rodriguez Cobo, B. Bochin, D. Esperante Pereira, Dmitry Golubkov, R. Messi, D. Galli, H. Degaudenzi, S. C. Haines, M. Patel, U. Trunk, L. Kravchuk, Alessandro Cardini, A. Petrella, Christian Rummel, Victor Coco, T. J. Gershon, J. J. Saborido Silva, B. Gui, V. Fernandez Albor, A. Büchler-Germann, K. Carvalho Akiba, Jan Buytaert, I. D'Antone, Johannes Albrecht, Malcolm John, P. Rodriguez Perez, Elie Aslanides, J. M. De Miranda, M. Rosello, M. Nedos, A. Vollhardt, Michael Alexander, W. Flegel, D. Lacarrere, E. 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Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Luminosity (scattering theory), Large Hadron Collider, Meson, 010308 nuclear & particles physics, Generator (category theory), Strangeness, 7. Clean energy, 01 natural sciences, Nuclear physics, 0103 physical sciences, High Energy Physics::Experiment, Production (computer science), Rapidity, Nuclear Experiment, 010306 general physics, Beam (structure)
Abstract

The production of K_short mesons in pp collisions at a centre-of-mass energy of 0.9 TeV is studied with the LHCb detector at the Large Hadron Collider. The luminosity of the analysed sample is determined using a novel technique, involving measurements of the beam currents, sizes and positions, and is found to be 6.8 +/- 1.0 microbarn^-1. The differential prompt K_short production cross-section is measured as a function of the K_short transverse momentum and rapidity in the region 0 < pT < 1.6 GeV/c and 2.5 < y < 4.0. The data are found to be in reasonable agreement with previous measurements and generator expectations.

Published
2010
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