Long-range angular correlations of pi, K and p in p-Pb collisions at root s(NN)=5.02 TeV
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Abstract
Angular correlations between unidentified charged trigger particles and
various species of charged associated particles (unidentified particles,
pions, kaons, protons and antiprotons) are measured by the ALICE
detector in p-Pb collisions at a nucleon-nucleon centre-of-mass energy
of 5.02 TeV in the transverse-momentum range 0.3 < p(T) < 4 GeV/c. The
correlations expressed as associated yield per trigger particle are
obtained in the pseudorapidity range vertical bar n(lab)vertical bar <
0.8. Fourrier coefficients are extracted from the long-range correlations
projected onto the azimuthal angle difference and studied as a function
of p(T) and in intervals of event multiplicity. In high-multiplicity
events, the second-order coefficient for protons, 4, is observed to be
smaller than that for pions, v(2)(pi), up to about p(T) = 2 GeV/c. To
reduce correlations due to jets, the per-trigger yield measured in
low-multiplicity events is subtracted from that in high-multiplicity
events. A two-ridge structure is obtained for all particle species. The
Fourier decomposition of this structure shows that the second-order
coefficients for pions and kaons are similar. The v(2)(p) is found to be
smaller at low P-T and larger at higher p(T) than v(2)(pi), with a
crossing occurring at about 2 GeV/c. This is qualitatively similar to
the elliptic-flow pattern observed in heavy-ion collisions. A mass
ordering effect at low transverse momenta is consistent with
expectations from hydrodynamic model calculations assuming a
collectively expanding system. (C) 2013 CERN. Published by Elsevier B.V.
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