Münster 2017 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 40: Heavy Ion Collisions and QCD Phases IX

HK 40.7: Talk

Thursday, March 30, 2017, 15:30–15:45, F 3

Neutral meson and direct photon measurements using conversions in proton-proton collisions at √s=7 TeV in ALICE — Nicolas Schmidt and •Lucas Altenkämper for the ALICE collaboration — Physikalisches Institut, Heidelberg University

The ALICE detector is dedicated to study the properties of the Quark-Gluon-Plasma, which is created in Pb-Pb collisions at high energies. The spectra in pp collisions are used to obtain a baseline of hadron production for heavy-ion collisions and can provide additional information to understand pQCD predictions at LHC energies. This work focuses on the measurement of neutral mesons via their two photon decay channel as well as the direct photon measurement using conversions in the detector material. For this, the ALICE Inner Tracking System (ITS) and the Time Projection Chamber (TPC) are mainly used. The status of the analysis in pp collisions at √s=7 TeV will be presented. Step by step, the signal extraction and applied efficiency correction will be explained. Final results are discussed and put into context with measurements at other LHC energies.