Two-particle correlations in pp and Pb-Pb collisions with ALICE

Abstract

The measurement of azimuthal correlations between two particles is a powerful tool to investigate the properties of strongly-interacting nuclear matter created in ultra-relativistic heavy-ion collisions. We present measurements of di-hadron correlations in azimuth angle and pseudorapidity in Pb-Pb collisions at $\sqrt{s_{\rm NN}} = 2.76 \tev$ and photon-hadron correlations in pp collisions at $\sqrt{s} = 7 \tev$ with the ALICE detector, respectively. In di-hadron correlations, the near-side jet shape in the short-range correlation region is quantitatively analyzed at $\ptt < 8 \gmom$, and the modification of jet-particle yield, $I_{\mathrm{AA}}$ and $I_{\mathrm{CP}}$, is measured at $8 < \ptt < 15 \gmom$. In photon-hadron correlations, isolated leading photon and associated hadrons in its opposite azimuthal direction correlations are used to estimate the jet fragmentation function via the imbalance parameter, $x_{\mathrm{E}}\equiv -\frac{{\vec{p}}_{\mathrm{T}}^{\gamma }\cdot {\vec{p}}_{\mathrm{T}}^{{\mathrm{h}}^{\pm }}}{|{\vec{p}}_{\mathrm{T}}^{\gamma }{|}^2}$.

10 pages, 14 figures, Proceedings for Hadron Nuclear Physics 2013-HNP2013, 18-22 July 2013, Zhangjiajie, China

References in corpus (2)

• Jet size dependence of single jet suppression in lead-lead collisions at sqrt(s(NN)) = 2.76 TeV with the ATLAS detector at the LHC
• Direct observation of dijets in central Au+Au collisions at sqrt(s_NN) = 200 GeV

Cited by in corpus (1)

• Differential two-particle number and momentum correlations with the AMPT, UrQMD, and EPOS models in Pb-Pb collisions at $\sqrt{{\text{s}}_{{}_{\mathrm{NN}}}}$= 2.76 TeV