Pseudorapidity distributions of charged particles in Pb-Pb collisions at super proton synchrotron energies from the NA50 experiment期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Pseudorapidity distributions of charged particles in Pb-Pb collisions at super proton synchrotron energies from the NA50 experiment

Affiliation:	(1) Università del Piemonte Orientale, Alessandria and INFN-Torino, Italy;(2) LAPP, CNRS-IN2P3, Annecy-le-Vieux, France;(3) LPC, Univ. Blaise Pascal and CNRS-IN2P3, Aubière, France;(4) IFA, Bucharest, Romania;(5) Università di Cagliari/INFN, Cagliari, Italy;(6) CERN, Geneva, Switzerland;(7) LIP, Lisbon, Portugal;(8) INR, Moscow, Russia;(9) IPN, Univ. de Paris-Sud and CNRS-IN2P3, Orsay, France;(10) LPNHE, Ecole Polytechnique and CNRS-IN2P3, Palaiseau, France;(11) IRS, Univ. Louis Pasteur and CNRS-IN2P3, Strasbourg, France;(12) Università di Torino/INFN, Torino, Italy;(13) IPN, Univ. Claude Bernard and CNRS-IN2P3, Villeurbanne, France;(14) YerPhI, Yerevan, Armenia;(15) FCT, Universidade de Algarve, Faro, Portugal;(16) IST, Universidade Técnica de Lisboa, Lisbon, Portugal;(17) CERN, Geneva, Switzerland;(18) Faculty of Physics and Nuclear Techniques, University of Mining and Metallurgy, Cracow, Poland;(19) UERJ, Rio de Janeiro, Brazil;(20) YerPhI, Yerevan, Armenia

Abstract:	We present the measurements of charged particle pseudorapidity distributions dN_ch/dη performed by the NA50 experiment in Pb-Pb collisions at the CERN SPS. Measurements were done at incident energies of 40 GeV (√s = 8.77 GeV) and 158 GeV (√s = 17.3 GeV) per nucleon over a broad impact parameter range. The multiplicity distributions are studied as a function of centrality using the number of participating nucleons(N _part), or the number of binary nucleon-nucleon collisions (N_coll). Their values at midrapidity exhibit a linear scaling withN _part at both energies. Particle yield increases approximately by a factor of 2 betweeny √s = 8.77 GeV and √s = 17.3 GeV.

Keywords:	Relativistic heavy-ion collisions pseudorapidity distributions multiparticle production silicon multiplicity detectors
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