Centrality dependence of the pseudorapidity density distribution for charged particles in Pb-Pb collisions at root s(NN)=5.02 TeV
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M. B. and Zimmermann, S. and Zinovjev, G. and Zmeskal, J. and ALICE
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Abstract
We present the charged-particle pseudorapidity density in Pb-Pb
collisions at root s(NN) = 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 tthe results at root s(NN) = 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. (C) 2017 The Author(s). Published by Elsevier B.V.... Show more Show less