Dresden 2013 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 3: Schwerionenkollisionen und QCD Phasen
HK 3.1: Gruppenbericht
Montag, 4. März 2013, 11:00–11:30, HSZ-201
Heavy-flavour measurements in the semi-electronic decay channel in proton-proton and Pb–Pb collisions with ALICE at the LHC — •Markus Fasel — Physikalisches Institut, Ruprecht-Karls Universität Heidelberg, Im Neuenheimer Feld 226, 69120 Heidelberg
Heavy quarks are produced in initial hard scatterings and experience the full history of nuclear collisions. Thus they are a unique tool to study properties of the hot and dense medium produced in heavy-ion collisions. In particular the dependence of the partonic energy loss in the quark-gluon plasma phase on the quark mass can be addressed. In addition, the measurement of the elliptic flow of heavy quarks allows to study the degree of their thermalization with the hot and dense medium. In proton-proton (pp) collisions, the measurement of heavy-flavour production allows to test perturbative QCD. Furthermore, it provides a reference for heavy-ion studies. With ALICE, the measurement of heavy-flavour production can be performed in the semi-electronic decay channel at midrapidity down to pT = 0.5 GeV/c. Besides the particle identification capabilities provided by the experiment, the Inner Tracking System allows a separation of electrons from charm and beauty hadron decays. We report on the measurement of electrons from heavy-flavour hadron decays, at midrapidity in pp collisions at √s = 2.76 TeV and √s = 7 TeV. For Pb–Pb collisions at √sNN = 2.76 TeV the suppression and the elliptic flow of electrons from semi-leptonic heavy-flavour hadron decays will be presented, and an outlook on measurements in p+Pb collisions will be given.