Data di Pubblicazione:
2002
Abstract:
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.
Tipologia CRIS:
03A-Articolo su Rivista
Elenco autori:
M.C. Abreu;B. Alessandro;C. Alexa;R. Arnaldi;M. Atayan;C. Baglin;A. Baldit;M. Bedjidian;S. Beolè;V. Boldea;P. Bordalo;G. Borges;A. Bussière;L. Capelli;C. Castanier;J. Castor;B. Chaurand;I. Chevrot;B. Cheynis;E. Chiavassa;C. Cicalò;T. Claudino;M.P. Comets;N. Constans;S. Constantinescu;P. Cortese;A. De Falco;N. De Marco;G. Dellacasa;A. Devaux;S. Dita;O. Drapier;L. Ducroux;B. Espagnon;J. Fargeix;P. Force;M. Gallio;Y.K. Gavrilov;C. Gerschel;P. Giubellino;M.B. Golubeva;M. Gonin;A.A. Grigorian;S. Grigorian;J.Y. Grossiord;F.F. Guber;A. Guichard;H. Gulkanyan;R. Hakobyan;R. Haroutunian;M. Idzik;D. Jouan;T.L. Karavitcheva;L. Kluberg;A.B. Kurepin;Y. Le Bornec;C. Lourenço;P. Macciotta;M. Mac Cormick;A. Marzari-Chiesa;M. Masera;A. Masoni;M. Monteno;A. Musso;P. Petiau;A. Piccotti;J.R. Pizzi;W.L. Prado da Silva;F. Prino;G. Puddu;C. Quintans;L. 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;M. Sitta;P. Sonderegger;X. Tarrago;N.S. Topilskaya;G.L. Usai;E. Vercellin;L. Villatte;N. Willis
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