Authors
MC Abreu, B Alessandro, C Alexa, R Arnaldi, M Atayan, C Baglin, A Baldit, M Bedjidian, Stefania Beolè, V Boldea, P Bordalo, G Borges, A Bussiere, Laurent Capelli, C Castanier, J Castor, B Chaurand, I Chevrot, B Cheynis, E Chiavassa, C Cicalo, T Claudino, MP Comets, N Constans, S Constantinescu, Pietro Cortese, Alessandro De Falco, N De Marco, G Dellacasa, A Devaux, S Dita, O Drapier, L Ducroux, B Espagnon, J Fargeix, P Force, Mauro Gallio, YK Gavrilov, C Gerschel, P Giubellino, MB Golubeva, M Gonin, AA Grigorian, S Grigorian, JY Grossiord, FF Guber, A Guichard, H Gulkanyan, R Hakobyan, R Haroutunian, M Idzik, D Jouan, TL Karavitcheva, L Kluberg, AB Kurepin, Y Le Bornec, C Lourenço, P Macciotta, M Mac Cormick, A Marzari-Chiesa, Massimo Masera, A Masoni, M Monteno, A Musso, P Petiau, A Piccotti, JR Pizzi, WL Prado da Silva, F Prino, G Puddu, C Quintans, Luciano Ramello, S Ramos, P Rato Mendes, L Riccati, A Romana, H Santos, P Saturnini, E Scalas, E Scomparin, S Serci, R Shahoyan, F Sigaudo, S Silva, Mario Sitta, P Sonderegger, X Tarrago, NS Topilskaya, GL Usai, E Vercellin, L Villatte, N Willis, NA50 Collaboration
Publication date
2002/3/28
Journal
Physics Letters B
Volume
530
Issue
1-4
Pages
43-55
Publisher
North-Holland
Description
The charged particle multiplicity distribution dNch/dη has been measured by the NA50 experiment in Pb–Pb collisions at the CERN SPS. Measurements were done at incident energies of 40 and 158 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 (Npart), or the number of binary nucleon–nucleon collisions (Ncoll). Their values at midrapidity exhibit a power law scaling behaviour given by Npart1.00 and Ncoll0.75 at 158 GeV. Compatible results are found for the scaling behaviour at 40 GeV. The width of the dNch/dη distributions is larger at 158 than at 40 GeV/nucleon and decreases slightly with centrality at both energies. Our results are compared to similar studies performed by other experiments both at the CERN SPS and at RHIC.
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Scholar articles
MC Abreu, B Alessandro, C Alexa, R Arnaldi, M Atayan… - Physics Letters B, 2002