Jet-like near-side peak shapes in Pb-Pb collisions at sqrt(s_NN) = 2.76 TeV with ALICE

TL;DR

This study analyzes the shape of jet-like near-side peaks in Pb-Pb collisions at 2.76 TeV, revealing how their width varies with collision centrality and particle momentum, using azimuthal and pseudo-rapidity correlations.

Contribution

It introduces a method to isolate jet-like peaks from flow effects and characterizes their shape using statistical measures across different collision centralities and momenta.

Findings

Rms in Deta increases with collision centrality.

Rms in Dphi remains constant across centralities.

Peak shape characterized by kurtosis varies with collision parameters.

Abstract

We present preliminary results from di-hadron correlations in azimuth (phi) and pseudo-rapidity (eta) induced by hadronic di-jets produced in Pb-Pb collisions at sqrt(s_NN) = 2.76 TeV. The jet-like near-side peak has been isolated from eta-independent collective flow correlations using an eta-gap method and its shape has been characterized by rms and excess kurtosis. These quantities have been studied as a function of centrality as well as of trigger (associated) particle transverse momentum ranging from 2-8 GeV (1-3 GeV). We observe that the rms in Deta increases with the centrality of the collisions whereas the rms in Dphi stays constant within experimental uncertainties.