Journal Article Centrality dependence of the pseudorapidity density distribution for charged particles in Pb-Pb collisions at root s(NN)=5.02 TeV

ALICE Collaboration  ,  Busch , O.  ,  Chujo , T.  ,  Esumi , S.  ,  Miake , Y.

772pp.567 - 577 , 2017-09 , Elsevier
ISSN:0370-2693
NCID:AA00774026
Description
We present the charged-particle pseudorapidity density in Pb–Pb collisions at 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 , while for the most peripheral (80–90%) we find . This corresponds to an increase of over the results at 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.
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