Münster 2011 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 63: Hauptvorträge VII

HK 63.2: Invited Talk

Friday, March 25, 2011, 12:15–12:45, HS1

Photons and Jets from the First Year of ALICE — •Ana Marin — GSI, Darmstadt, Germany

In order to study the Quark-Gluon Plasma (QGP) formed in heavy-ion collisions, direct photons are particularly interesting because they directly probe the high temperature and high density phase of these collisions. Direct photons have to be isolated from the main source of background photons, i.e. the decay of hadrons (mainly π⁰’s and η’s) after the QGP phase. To study the full evolution of the produced medium the usage of hard probes is also of particular interest. Moreover, the cross section of hard probes are increasing by large factors at LHC energies compared to RHIC or SPS. Therefore, full jet reconstruction would be exploited to extract quantitative information from the medium properties created in heavy-ion collisions by comparing results in p+p and Pb+Pb collisions.

During the year 2010 the CERN LHC delivered p+p collisions at √s = 7 TeV and Pb+Pb collisions at √s_NN = 2.76 TeV, the highest energy ever achieved. The p+p runs are essential to obtain important reference data for heavy-ion runs as well as a test of pQCD. In this talk we will present the measurement of π⁰ and η mesons and the status of the direct photon analysis in p+p collisions at 7 TeV. Moreover results in p+p collisions from full jet reconstruction, namely raw jet-production rates and more specific momentum distribution of tracks within jets and the single track correlation to jets which is sensitive to medium effects of the QGP will be shown. First insides from Pb+Pb collisions will also be presented.