Harmonic decomposition of two-particle angular correlations in Pb-Pb collisions at sqrt(sNN) = 2.76 TeV

Details Harmonic decomposition of two-particle angular correlations in Pb-Pb collisions at sqrt(sNN) = 2.76 TeV Harmonic decomposition of two-particle angular correlations in Pb-Pb collisions at sqrt(sNN) = 2.76 TeV

2011-09-12

arxiv.org/abs/1109.2501v2

Physics

Nuclear Physics

Nuclear Experiment

11 figures, 27 pages, authors start at page 21

Scientific paper

Angular correlations between unidentified charged trigger (t) and associated (a) particles are measured by the ALICE experiment in Pb-Pb collisions at sqrt(sNN) = 2.76 TeV for transverse momenta 0.25 < pT^{t,a} < 15 GeV/c, where pT^t > pT^a. The shapes of the pair correlation distributions are studied in a variety of collision centrality classes between 0 and 50% of the total hadronic cross section for particles in the pseudorapidity interval |\eta| < 1.0. Distributions in relative azimuth \Delta\phi \equiv \phi^t - \phi^a are analyzed for |\Delta\eta| \equiv |\eta^t - \eta^a| > 0.8, and are referred to as "long-range correlations". Fourier components V_{n\Delta} \equiv are extracted from the long-range azimuthal correlation functions. If particle pairs are correlated to one another through their individual correlation to a common symmetry plane, then the pair anisotropy V_{n\Delta}(pT^t, pT^a) is fully described in terms of single-particle anisotropies v_n(pT) as V_{n\Delta}(pT^t, pT^a) = v_n(pT^t) v_n(pT^a). This expectation is tested for 1 \leq n \leq 5 by applying a global fit of all V_{n\Delta}(pT^t, pT^a) to obtain the best values v_n{GF}(pT). It is found that for 2 \leq n \leq 5, the fit agrees well with data up to pT^a \sim 3-4 GeV/c, with a trend of increasing deviation as pT^t and pT^a are increased or as collisions become more peripheral. This suggests that no pair correlation harmonic can be described over the full 0.25 < pT < 15 GeV/c range using a single v_n(pT) curve; such a description is however approximately possible for 2 \leq n \leq 5 when pT^a < 4 GeV/c. For the n=1 harmonic, however, a single v_1(pT) curve is not obtained even within the reduced range pT^a < 4 GeV/c.

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