# Multiplicity of charged particles in Pb–Pb collisions at SPS energies

Abstract : The multiplicity of charged particles in the central rapidity region has been measured by the NA57 experiment in Pb–Pb collisions at the CERN SPS at two beam momenta: 158 A GeV/c and 40 A GeV/c. The value of $dN_{ch}/d\eta$ at the maximum has been determined and studied as a function of centrality within the range covered by NA57 (about 55% most central part of the inelastic cross section). The central rapidity multiplicity varies roughly linearly with the number of wounded nucleons (participants) and increases approximately logarithmically with the centre of mass energy
Document type :
Conference papers

http://hal.in2p3.fr/in2p3-00080173
Contributor : Yvette Heyd <>
Submitted on : Friday, June 16, 2006 - 2:29:03 PM
Last modification on : Friday, May 8, 2020 - 1:10:41 AM

### Citation

A. Jacholkowski, P.A. Bacon, A. Badala, R. Barbera, A. Belogianni, et al.. Multiplicity of charged particles in Pb–Pb collisions at SPS energies. Focus on Multiplicity : International Workshop on Particle Multiplicity in Relativistic Heavy Ion Collisions, Jun 2004, Bari, Italy. pp.64-73, ⟨10.1088/1742-6596/5/1/006⟩. ⟨in2p3-00080173⟩

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