Multiplicity dependence of jet-like two-particle correlation structures in p-Pb collisions at root s(NN)=5.02 TeV
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Abstract
Two-particle angular correlations between unidentified charged trigger
and associated particles are measured by the ALICE detector in p-Pb
collisions at a nucleon-nucleon centre-of-mass energy of 5.02 TeV. The
transverse-momentum range 0.7 < p(T),(assoc) < p(T),(trig) < 5.0 GeV/c
is examined, to include correlations induced by jets originating from
low momentum-transfer scatterings (minijets). The correlations expressed
as associated yield per trigger particle are obtained in the
pseudorapidity range vertical bar eta vertical bar < 0.9. The near-side
long-range pseudorapidity correlations observed in high-multiplicity
p-Pb collisions are subtracted from both near-side short-range and
away-side correlations in order to remove the non-jet-like components.
The yields in the jet-like peaks are found to be invariant with event
multiplicity with the exception of events with low multiplicity. This
invariance is consistent with the particles being produced via the
incoherent fragmentation of multiple parton-parton scatterings, while
the yield related to the previously observed ridge structures is not
jet-related. The number of uncorrelated sources of particle production
is found to increase linearly with multiplicity, suggesting no
saturation of the number of multi-parton interactions even in the
highest multiplicity p-Pb collisions. Further, the number scales only in
the intermediate multiplicity region with the number of binary
nucleon-nucleon collisions estimated with a Glauber Monte-Carlo
simulation. (C) 2014 The Authors. Published by Elsevier B.V. This is an
open access article under the CC BY license
(http://creativecommons.org/licenses/by/3.0/).... Show more Show less