Tuesday, October 25, 2011, 11:00 am — Small Seminar Room, Bldg. 510
Angular correlations between unidentified charged trigger (t) and associated (a) particles are measured in Pb--Pb collisions at 2.76 TeV by the ALICE experiment for transverse momenta 0.25 < pTt,a < 15 GeV/c, where pTt > pTa. The pair correlation shapes are examined in a variety of collision centrality categories for particles in the pseudorapidity range η < 1.0 separated by |ηt - ηa| > 0.8. A series of two-particle Fourier components VnΔ = <cos(nΔΦ)> are extracted from the long-range azimuthal correlation functions. For each harmonic, a fit is applied over all pT bins simultaneously to test the collectivity hypothesis VnΔ (pTt, pTa) = vn(pTt ) vn(pTa). For n > 1, the factorization holds for particle momenta up to a few GeV/c, with a trend of increasing deviation as pT is increased and as collisions become more peripheral. It is found that V1Δ does not factorize precisely at any momentum or centrality, suggesting that it is produced by different mechanisms than the higher moments. For n > 1, the divergence between the data and the global fit quantifies the onset of nonflow dominance in long-range correlations due to the away side jet. The vn values for n > 1 from the global fit are in close agreement with results from existing flow measurements.
Hosted by: Anne Sickles
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