Centrality dependence of the pseudorapidity density distribution for charged particles in Pb-Pb collisions at root s(NN)=2.76 TeV
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M. and Zyzak, M. and ALICE Collaboration... Show more Show less
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Abstract
We present the first wide-range measurement of the charged-particle
pseudorapidity density distribution, for different centralities (the
0-5\%, 5-10\%, 10-20\%, and 20-30\% most central events) in Pb-Pb
collisions at root s(NN) = 2.76 TeV at the LHC. The measurement is
performed using the full coverage of the ALICE detectors, -5.0 < eta <
5.5, and employing a special analysis technique based on collisions
arising from LHC `satellite' bunches. We present the pseudorapidity
density as a function oof the number of participating nucleons as well as
an extrapolation to the total number of produced charged particles (N-ch
= 17165 +/- 772 for the 0-5\% most central collisions). From the
measured dN(ch)/d eta distribution we derive the rapidity density
distribution, dN(ch)/dy, under simple assumptions. The rapidity density
distribution is found to be significantly wider than the predictions of
the Landau model. We assess the validity of longitudinal scaling by
comparing to lower energy results from RHIC. Finally the mechanisms of
the underlying particle production are discussed based on a comparison
with various theoretical models. (C) 2013 CERN. Published by Elsevier
B.V. All rights reserved.... Show more Show less