Long-range angular correlations of pi, K and p in p-Pb collisions at root s(NN)=5.02 TeV

By Alice Collaboration. 2013

224 citations recorded by the source corpus.

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. Fourier 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. All rights reserved.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/03940196e8b389fae2fa7922830041ab4b60cec5

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In Nuclear and High Energy Physics

Citations in the corpus

Multiplicity dependence of light-flavor hadron production in pp collisions at √s = 7 TeV (2019, background): “In p–Pb collisions, these include the observation of double-ridge structures on the near and away side in two-particle correlation studies [1], non-vanishing v2 coefficients in multi-particle cumulant studies [2], mass dependent hardening of identified particle pT spectra [3–5] and consistency of in”
Properties of hot and dense matter from relativistic heavy ion collisions (2015, background): “An important recent discovery is the observation of significant elliptic and triangular flow in high multiplicity p+Pb collisions at the LHC [213, 214, 215].”