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Multiplicity of charged particles in Pb-Pb collisions at SPS energies

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HAL-IN2P3
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  • [Phys.Hexp] Physics [Physics]/High Energy Physics - Experiment [Hep-Ex]
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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/{\it c} and 40 A GeV/{\it c}. The value of $dN_{ch}/d\eta$ at the maximum has been determined and its behaviour as a function of centrality has been studied in the centrality range covered by NA57 (about 50% of the inelastic cross section). The multiplicity increases approximately logarithmically with the centre of mass energy.

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