π0-hadron correlations in pp and Pb–Pb collisions and π0 elliptic flow in Pb–Pb collisions measured at the ALICE experiment

Abstract

The study of the azimuthal correlation and anisotropy with π0 offers a powerful way to investigate the properties of strongly-interacting matter created in ultra-relativistic heavy-ion collisions. In this talk, we present the measurement of two-particle correlations of π0 trigger particles with associated charged particles versus azimuthal angle difference (Δφ) in pp and central Pb–Pb collisions at sNN=2.76 TeV, as well as the measurement of the elliptic flow (v2) of π0 in Pb-Pb collisions at sNN=2.76 TeV at the ALICE experiment. π0 are detected by the ALICE electromagnetic calorimeter EMCal for transverse momenta 8<pT<16 GeV/c, and charged particles are measured by the ALICE main tracking detectors ITS and TPC for 0.5<pT<10 GeV/c, both at mid-rapidity. For π0-hadron correlations, the per-trigger yield modification factors (IAA) are extracted on the near and away side and are compared with results from models and other experiments. For π0v2, the current status of measurement will be presented. Both measurements serve as important investigations of the medium modified fragmentation pattern and the path-length dependence of energy loss in QGP, as well as the corresponding physics interpretation.