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 2.7: Talk
Monday, February 26, 2018, 15:45–16:00, HZO 60
Measurement of neutral mesons in Pb-Pb collisions at √sNN=5.02 TeV with the photon conversion method in the ALICE experiment — •Meike Danisch for the ALICE collaboration — Physikalisches Institut Heidelberg
Neutral mesons can provide important information on the energy loss of partons traversing the hot and dense matter, which is created in high energy heavy-ion collisions. Furthermore, they constitute the largest background contribution for direct photons, which are among the most important tools to study the properties of the Quark Gluon Plasma. In the ALICE experiment, neutral mesons can be measured via their decay to two photons. Apart from the two calorimeters EMCal and PHOS, photons can be reconstructed also via the Photon Conversion Method (PCM). The latter exploits the fact that a photon can convert to an electron-positron pair. These charged particles can be detected via their tracks in the Time Projection Chamber (TPC) and the Inner Tracking System (ITS). The PCM allows the measurement of both photons and neutral mesons, carrying low transverse momenta (pT 1 GeV), with very good energy resolution. Apart from presenting the performance of the photon conversion method, results from the π0 and η meson production measurement in Pb-Pb collisions with a center-of-mass collision energy per nucleon of √sNN=5.02 TeV will be shown.