Multiplicity dependence of the average transverse momentum in pp, p-Pb, and Pb-Pb collisions at the LHC
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and Zoccarato, Y. and Zynovyev, M. and Zyzak, M. and ALICE Collaboration... Show more Show less
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Abstract
The average transverse momentum (p(T)) versus the charged-particle
multiplicity N-ch was measured in p-Pb collisions at a collision energy
per nucleon-nucleon root S-NN = 5.02 TeV and in pp collisions at
collision energies of root s = 0.9, 2.76, and 7 TeV in the kinematic
range 0.15 < p(T) < 10.0 GeV/c and vertical bar eta vertical bar < 0.3
with the ALICE apparatus at the LHC. These data are compared to results
in Pb-Pb collisions at root S-NN = 2.76 TeV at similar charged-particle
multiplicitiies. In pp and p-Pb collisions, a strong increase of (p(T))
with N-ch is observed, which is much stronger than that measured in
Pb-Pb collisions. For pp collisions, this could be attributed, within a
model of hadronizing strings, to multiple-parton interactions and to a
final-state color reconnection mechanism. The data in p-Pb and Pb-Pb
collisions cannot be described by an incoherent superposition of
nucleon-nucleon collisions and pose a challenge to most of the event
generators. (C) 2013 CERN. Published by Elsevier B.V. All rights
reserved.... Show more Show less