Mainz 2012 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 7: Schwerionenkollisionen und QCD Phasen
HK 7.6: Vortrag
Montag, 19. März 2012, 15:30–15:45, P 5
Measurement of the Nuclear Modification Factor of Electrons from Semileptonic Heavy Flavor Decays in PbPb Collisions with ALICE at the LHC — •Martin Völkl — Physikalisches Institut Heidelberg, Heidelberg, Germany
Heavy quarks are important probes of the QCD medium produced via heavy ion collisions as the medium-induced parton energy loss depends on the mass and its color-charge. Charm and beauty quarks are for the most part created early in the collision and thus traverse much of the hadronic matter. In 2010 and 2011, pp collisions at √s=7 TeV and PbPb collisions at √sNN=2.76 TeV have been recorded by ALICE at the LHC. By subtracting the measured spectra of electrons from other sources, the spectrum of electrons from heavy flavor decays may be obtained. To gain an insight into the contribution from charm and beauty quarks individually, a cut on the impact parameter of the electrons can be used to preferentially select electrons from the decays of hadrons containing beauty quarks due to their high mass and large proper decay length (cτ500µ m). We present the preliminary results of the nuclear modification factor for electrons from heavy flavor decays and the current status of the analysis of the beauty contribution to it.