2016/12/14 by Monika Kofarago, Kofarago, Monika
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #Nuclear Experiment (nucl-ex) #hep-ex #nucl-ex
paper · pdf · doi:10.48550/arxiv.1612.04618
4 pages, 5 figures, proceedings of the 8th International Conference on Hard and Electromagnetic Probes of High-energy Nuclear Collisions, 23-27 September 2016, Wuhan, China
arxiv created 2016/12/14 · arxiv updated 2016/12/19
Two-particle angular correlation measurements are sensitive probes of the interactions of particles with the medium formed in heavy-ion collisions. Such measurements are done by determining the distribution of the relative pseudorapidity (Δη) and azimuthal angle (Δφ) of particles with respect to a higher pT trigger particle (1 < pT,trig < 8 GeV/c). The near-side peak is fitted with a function, which includes both the near-side jet peak and also accounts for the Δη-independent long-range correlations. The centrality evolution of the width (variance) of the fitted distribution is investigated. In Pb-Pb collisions a significant broadening of the near-side peak in the Δη direction is observed from peripheral to central collisions, while in the Δφ direction the peak is almost independent of centrality. For the 10% most central events, a departure from the Gaussian shape is also observed at low transverse momentum (1 < pT,assoc < 2 GeV/c, 1 < pT,trig < 3 GeV/c). In this contribution the results obtained by the ALICE experiment in Pb-Pb and pp collisions at √sNN = 2.76 TeV are shown, and they are interpreted in terms of radial and elliptic flow by comparing them to AMPT model simulations.