Copy For Citation
Adam J., Adamova D., Aggarwal M. M., Rinella G. A., Agnello M., Agrawa N., ...More
PHYSICAL REVIEW LETTERS, vol.118, no.16, 2017 (SCI-Expanded)
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Publication Type:
Article / Article
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Volume:
118
Issue:
16
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Publication Date:
2017
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Doi Number:
10.1103/physrevlett.118.162302
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Journal Name:
PHYSICAL REVIEW LETTERS
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Journal Indexes:
Science Citation Index Expanded (SCI-EXPANDED), Scopus
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Bursa Uludag University Affiliated:
No
Abstract
We present the first measurement of the two-particle transverse momentum differential correlation function, P-2 = / < p(T)>(2), in Pb-Pb collisions at root s(NN) = 2.76 TeV. Results for P-2 are reported as a function of the relative pseudorapidity (Delta eta) and azimuthal angle (Delta phi) between two particles for different collision centralities. The Delta phi dependence is found to be largely independent of Delta eta for broken vertical bar Delta eta broken vertical bar >= 0.9. In the 5% most central Pb-Pb collisions, the two-particle transverse momentum correlation function exhibits a clear double-hump structure around Delta phi=pi (i. e., on the away side), which is not observed in number correlations in the same centrality range, and thus provides an indication of the dominance of triangular flow in this collision centrality. Fourier decompositions of P-2, studied as a function of the collision centrality, show that correlations at broken vertical bar Delta eta broken vertical bar >= 0.9 can be well reproduced by a flow ansatz based on the notion that measured transverse momentum correlations are strictly determined by the collective motion of the system.