Centrality dependence of the pseudorapidity density distribution for charged particles in Pb–Pb collisions at √sNN=5.02 TeV

J. Adam, H.A. Andrews, D. Evans, K.L. Graham, P.G. Jones, A. Jusko, M. Krivda, R. Lietava, O. Villalobos Baillie, N. Zardoshti, ALICE Collaboration

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Abstract

We present the charged-particle pseudorapidity density in Pb–Pb collisions at √sNN=5.02 TeV in centrality classes measured by ALICE. The measurement covers a wide pseudorapidity range from −3.5 to 5, which is sufficient for reliable estimates of the total number of charged particles produced in the collisions. For the most central (0–5%) collisions we find 21,400 ± 1,300, while for the most peripheral (80–90%) we find 230 ± 38. This corresponds to an increase of (27 ± 4)% over the results at √sNN=2.76 TeV previously reported by ALICE. The energy dependence of the total number of charged particles produced in heavy-ion collisions is found to obey a modified power-law like behaviour. The charged-particle pseudorapidity density of the most central collisions is compared to model calculations — none of which fully describes the measured distribution. We also present an estimate of the rapidity density of charged particles. The width of that distribution is found to exhibit a remarkable proportionality to the beam rapidity, independent of the collision energy from the top SPS to LHC energies.
Original languageEnglish
Pages (from-to)567-577
Number of pages11
JournalPhysics Letters B
Volume772
Early online date14 Jul 2017
DOIs
Publication statusE-pub ahead of print - 14 Jul 2017

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