Bochum 2018 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 2: Heavy Ion Collisions and QCD Phases I

HK 2.1: Group Report

Monday, February 26, 2018, 14:00–14:30, HZO 60

Measurement of direct photons in Pb-Pb collisions at centre-of-mass energy per nucleon of 2.76 TeV with the Photon Conversion Method in the ALICE experiment at LHC — •Lucia Leardini for the ALICE collaboration — Physikalisches Institut — Heidelberg university

Photons are produced throughout the evolution of the Quark-Gluon Plasma (QGP), the hot and dense medium that is formed in heavy-ion collisions. The direct photons, originating from the early stages of the system evolution, are of particular interest to study the QGP characteristics and temperature at the photon emission time. The measurement presented here is extracted from the 2011 Pb-Pb run and relies on the Photon Conversion Method (PCM), based on the reconstruction of photon conversions by the Inner Tracking System (ITS) and the Time Projection Chamber (TPC).