Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8190980 | Physics Letters B | 2012 | 16 Pages |
Abstract
Angular correlations between unidentified charged trigger (t) and associated (a) particles are measured by the ALICE experiment in Pb-Pb collisions at sNN=2.76TeV for transverse momenta 0.25pTa. 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 |η|<1.0. Distributions in relative azimuth ÎÏâ¡ÏtâÏa are analyzed for |Îη|â¡|ηtâηa|>0.8, and are referred to as “long-range correlations”. Fourier components VnÎâ¡ãcos(nÎÏ)ã 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 VnÎ(pTt,pTa) is fully described in terms of single-particle anisotropies vn(pT) as VnÎ(pTt,pTa)=vn(pTt)vn(pTa). This expectation is tested for 1⩽n⩽5 by applying a global fit of all VnÎ(pTt,pTa) to obtain the best values vn{GF}(pT). It is found that for 2⩽n⩽5, the fit agrees well with data up to pTaâ¼3-4GeV/c, with a trend of increasing deviation as pTt and pTa are increased or as collisions become more peripheral. This suggests that no pair correlation harmonic can be described over the full 0.25
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Nuclear and High Energy Physics
Authors
ALICE Collaboration ALICE Collaboration, K. Aamodt, B. Abelev, A. Abrahantes Quintana, D. Adamová, A.M. Adare, M.M. Aggarwal, G. Aglieri Rinella, A.G. Agocs, A. Agostinelli, S. Aguilar Salazar, Z. Ahammed, N. Ahmad, A. Ahmad Masoodi, S.U. Ahn,