Centrality evolution of the charged-particle pseudorapidity density over a broad pseudorapidity range in Pb-Pb collisions at root s(NN)=2.76TeV
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M. B. and Zinovjev, G. and Zyzak, M. and ALICE Collaboration... Show more Show less
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Abstract
The centrality dependence of the charged-particle pseudorapidity density
measured with ALICE in Pb-Pb collisions at root s(NN) = 2.76 TeV over a
broad pseudorapidity range is presented. This Letter extends the
previous results reported by ALICE to more peripheral collisions. No
strong change of the overall shape of charged-particle pseudorapidity
density distributions with centrality is observed, and when normalised
to the number of participating nucleons in the collisions, the evolution
over psseudorapidity with centrality is likewise small. The broad
pseudorapidity range (-3.5 < eta < 5) allows precise estimates of the
total number of produced charged particles which we find to range from
162 +/- 22(syst.) to 17170 +/- 770(syst.) in 80-90\% and 0-5\% central
collisions, respectively. The total charged-particle multiplicity is
seen to approximately scale with the number of participating nucleons in
the collision. This suggests that hard contributions to the
charged-particle multiplicity are limited. The results are compared to
models which describe dN(ch)/d(eta) at mid-rapidity in the most central
Pb-Pb collisions and it is found that these models do not capture all
features of the distributions. (C) 2016 CERN for the benefit of the
ALICE Collaboration. Published by Elsevier B.V.... Show more Show less