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1. Charged particle multiplicity in Pb-Pb collisions from the NA50 experiment

Author

R. Haroutunian, Roberta Arnaldi, Sanda Dita, D. Jouan, C. Quintans, M. Atayan, G. Borges, T. Claudino, T.L. Karavitcheva, B. Espagnon, P. Petiau, A. Baldit, Paolo Giubellino, Pietro Cortese, Stefania Beole, Enrico Scomparin, Y.K. Gavrilov, M. Gonin, Serban Constantinescu, X. Tarrago, P. Sonderegger, Mario Sitta, C. Castanier, P. Force, Marek Idzik, O. Drapier, H.R. Gulkanyan, F.F. Guber, Alexey Kurepin, Carlos Lourenco, L. Kluberg, N.S. Topilskaya, P. Saturnini, M. Mac Cormick, Mauro Gallio, V. Boldea, L. Riccati, A. Musso, G. L. Usai, C. Baglin, P. Rato Mendes, S. Serci, Ermanno Vercellin, Luciano Ramello, G. Puddu, J.-R. Pizzi, Bruno Alessandro, B. Chaurand, L. Capelli, N. Willis, A. Devaux, C. Gerschel, F Prino, W.L. Prado da Silva, F. Sigaudo, J.-Y. Grossiord, A. Piccotti, T. Wu, A. Bussiere, M. P. Comets, Enrico Scalas, A. Defalco, A.A. Grigorian, G. Dellacasa, Alberto Masoni, A. Romana, João Cruz, P. Macciotta, Calin Alexa, Helena Santos, M.B. Golubeva, M. Bedjidian, A. Guichard, F. Prino, S. Grigorian, J. Fargeix, A. Marzari-Chiesa, Massimo Masera, P. Bordalo, S. Ramos, R Hokobyan, Brigitte Cheynis, E. Chiavassa, Ruben Shahoyan, N DeMarco, Marco Monteno, Y. Le Bornec, J. Castor, S. Borenstein, L. Villatte, Corrado Cicalo, 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), 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), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), 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), NA50, Laboratoire d'Annecy de Physique des Particules (LAPP/Laboratoire d'Annecy-le-Vieux de Physique des Particules), Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and 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)

Subjects
Physics, History, Large Hadron Collider, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Nuclear Theory, 01 natural sciences, 7. Clean energy, Charged particle, Computer Science Applications, Education, Nuclear physics, Transverse plane, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], 0103 physical sciences, Impact parameter, Multiplicity (chemistry), Atomic physics, Nuclear Experiment, 010306 general physics, Nucleon, Particle density, Charged particle beam
Abstract

NA50; Angular distributions of charged particles produced in Pb-Pb collisions at the CERN SPS have been measured by the NA50 experiment. Measurements have been performed with a silicon microstrip detector at two different beam energies (40 and 158 GeV/nucleon) and over a wide impact parameter (centrality) range. The centrality of the collision has been evaluated both by neutral transverse energy released in the interaction and by spectator nucleons energy (zero degree energy). The charged particle density at midrapidity shows a linear dependence on the number of participating nucleons at both beam energies. The particle density per participant pair and its $\sqrt{S}$ dependence are also studied.

Published
2005
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2. The production of , and mesons in p-, d-, S- and Pb-induced reactions at the CERN SPS

Author

Corrado Cicalo, X. Tarrago, C. Castanier, Mario Sitta, Sergio Serci, H.R. Gulkanyan, E. Vercellin, M. Bedjidian, Stefania Beole, W.L. Prado da Silva, F. Sigaudo, N DeMarco, M. Gallio, S. Grigorian, F.F. Guber, P. Force, S. Borenstein, Luciano Ramello, R. Haroutunian, A. Guichard, L. Villatte, Pietro Cortese, Massimo Masera, Y.K. Gavrilov, J. Fargeix, M. Mac Cormick, Enrico Scalas, A. Defalco, A.A. Grigorian, A. Marzari-Chiesa, Marco Monteno, Alexey Kurepin, Y. Le Bornec, E. Chiavassa, Ruben Shahoyan, João Cruz, A. Musso, A. Masoni, F Prino, G. Dellacasa, A. Romana, P. Rato Mendes, Roberta Arnaldi, G. Puddu, Carlos Lourenco, M. P. Comets, Helena Santos, Calin Alexa, G. L. Usai, P. Bordalo, B. Chaurand, L. Kluberg, N.S. Topilskaya, J. Castor, R. Hakobyan, O. Drapier, C. Gerschel, S. Ramos, G. Borges, T.L. Karavitcheva, A. Baldit, C. Baglin, Serban Constantinescu, B. Espagnon, C. Quintans, M. Atayan, Brigitte Cheynis, Bruno Alessandro, J.-R. Pizzi, Enrico Scomparin, L. Riccati, M. Gonin, T. Claudino, J.-Y. Grossiord, P. Macciotta, Marek Idzik, P. Petiau, P. Sonderegger, T. Wu, Sanda Dita, D. Jouan, V. Boldea, L. Capelli, N. Willis, A. Devaux, P. Saturnini, A. Piccotti, A. Bussiere, M.B. Golubeva, and Paolo Giubellino

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Muon, Meson, Proton, 010308 nuclear & particles physics, 7. Clean energy, 01 natural sciences, Omega, Nuclear physics, Pair production, Deuterium, 0103 physical sciences, 010306 general physics
Abstract

From proton, deuteron, S- and Pb-induced reactions, experiments NA38 and NA50 have measured muon pair production with various targets. In particular, the production rates of the , ω and ρ mesons have been simultaneously extracted and compared. Preliminary partial results of the most recent Pb–Pb measurement done in year 2000 by NA50 are presented here. They are also included in the comparison with the results obtained with lighter interacting nuclei.

Published
2003
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3. $\phi$ and $\rho$ $plus$ $\omega$ vector-mesons produced in lead-induced collisions

Author

P. Rato Mendes, B. Chaurand, S R Borenstein, Mauro Gallio, V. Boldea, C. Gerschel, Mario Sitta, H.R. Gulkanyan, J. Fargeix, Sergio Serci, M. P. Comets, A. Masoni, Ermanno Vercellin, Enrico Scomparin, M. Gonin, S. Ramos, A. Baldit, A. Romana, Y Le Bornec, Calin Alexa, L. Ramello, W.L. Prado da Silva, P. Petiau, Roberta Arnaldi, F. Sigaudo, G. Puddu, P. Sonderegger, Paolo Giubellino, Bruno Alessandro, L. Riccati, N. De Marco, E Scalas, A. De Falco, Sanda Dita, D. Jouan, C Castanier, A. Bussiere, G. Borges, M.C. Abreu, C. Quintans, A. Guichard, T.L. Karavitcheva, M. Atayan, P. Saturnini, Serban Constantinescu, N. Constans, Y.K. Gavrilov, B. Espagnon, M.B. Golubeva, A. Piccotti, J.-R. Pizzi, Alexey Kurepin, A.A. Grigorian, L. Villatte, João Cruz, S. Silva, F. Prino, Jean-Yves Grossiord, M Bedjidian, N. Willis, L Capelli, G. L. Usai, A. Musso, Brigitte Cheynis, Pietro Cortese, Carlos Lourenco, L. Kluberg, N.S. Topilskaya, Stefania Beole, A. Marzari-Chiesa, Marco Monteno, P. Force, M. Mac Cormick, J. Castor, Corrado Cicalo, S. Grigorian, X. Tarrago, T. Claudino, Massimo Masera, E. Chiavassa, Ruben Shahoyan, C. Baglin, R Haroutunian, G. Dellacasa, Helena Santos, P. Macciotta, O Drapier, P. Bordalo, R. Hakobyan, A. Devaux, Marek Idzik, and F.F. Guber

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Proton, Meson, Strangeness production, Inverse, Heavy ion, Nuclear Experiment, Omega, Scaling, Ion
Abstract

The experiment NA50 studies the strangeness production by means of the BRμμσ/(BRρμμσρ + BRωμμσω) cross-sections ratio in relativistic heavy ion collisions with respect to proton and light ion collisions. New results for Pb+Pb interactions at 158 A GeV/c are presented (1998 data) and analysed with a different method. The BRμμσ/(BRρμμσρ + BRωμμσω) ratio shows an increase with the number of participants, in agreement with previous results. The inverse slope parameter extracted from the MT universal scaling is also studied.

Published
2002
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