Centrality dependence of the pseudorapidity density distribution for charged particles in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV

Abstract

We present the charged-particle pseudorapidity density in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02\mathrm{Te}\mathrm{V}$ 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 $21400\pm 1300$ while for the most peripheral (80-90%) we find $230\pm 38$. This corresponds to an increase of $(27\pm 4)\%$ over the results at $\sqrt{s_{\mathrm{NN}}}=2.76\mathrm{Te}\mathrm{V}$ 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.

arXiv comment18 pages, 6 captioned figures, authors from page 13, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/3337

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