Centrality Dependence of the Charged-Particle Multiplicity Density at Midrapidity in Pb-Pb Collisions at √sNN =5.02 TeV

ALICE Collaboration

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Abstract

The pseudorapidity density of charged particles, dNch/dη, at midrapidity in Pb-Pb collisions has been measured at a center-of-mass energy per nucleon pair of √sNN = 5.02  TeV. For the 5% most central collisions, we measure a value of 1943±54. The rise in dNch/dη as a function of √sNN is steeper than that observed in proton-proton collisions and follows the trend established by measurements at lower energy. The increase of dNch/dη as a function of the average number of participant nucleons, ⟨Npart⟩, calculated in a Glauber model, is compared with the previous measurement at √sNN = 2.76  TeV. A constant factor of about 1.2 describes the increase in dNch/dη from √sNN = 2.76 to 5.02 TeV for all centrality classes, within the measured range of 0%–80% centrality. The results are also compared to models based on different mechanisms for particle production in nuclear collisions.
Original languageEnglish
Article number222302
JournalPhysical Review Letters
Volume116
Issue number22
DOIs
Publication statusPublished - 3 Jun 2016

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