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Title: | Long-range angular correlations of π, K and p in p-Pb collisions at √sNN=5.02 TeV |
Authors: | Mohanty, Bedangadas |
Issue Date: | 7-Oct-2013 |
Publisher: | Physics Letters B |
Citation: | Abelev, B., Adam, J., Adamová, D., Adare, A. M., Aggarwal, M. M., Aglieri Rinella, G., … Zyzak, M. (2013). Long-range angular correlations of π, K and p in p–Pb collisions at √sNN=5.02 TeV. Physics Letters. Part B, 726(1–3), 164–177. |
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<pT<4 GeV/c. The correlations expressed as associated yield per trigger particle are obtained in the pseudorapidity range |ηlab|<0.8. Fourier coefficients are extracted from the long-range correlations projected onto the azimuthal angle difference and studied as a function of pT and in intervals of event multiplicity. In high-multiplicity events, the second-order coefficient for protons, v2p, is observed to be smaller than that for pions, v2π, up to about pT=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 v2p is found to be smaller at low pT and larger at higher pT than v2π, 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. |
URI: | https://doi.org/10.1016/j.physletb.2013.08.024 http://idr.niser.ac.in:8080/jspui/handle/123456789/1092 |
Appears in Collections: | Journal Papers |
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