Heidelberg 2015 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 48: Poster

HK 48.27: Poster

Mittwoch, 25. März 2015, 17:00–19:00, C/Foyer

Study of intermediate mass e+e- pairs from correlated semileptonic decays of heavy-flavour hadrons — •Marvin Kohls, Raphaelle Bailhache, and Harald Appelshäuser for the ALICE collaboration — Institut für Kernphysik, Goethe-Universität Frankfurt am Main

The main purpose of ALICE at the LHC is to investigate the properties of the deconfined state of strongly interacting matter produced in high-energy heavy-ion collisions. Since leptons do not interact strongly with the medium, dielectrons carry information from all collision stages with negligible final state interactions. In particular in the intermediate invariant mass region the measurements of thermal dielectron emission would allow to estimate the temperature of the medium created. The main background is coming from electron-positron pair from correlated semi-leptonic charm and anti-charm quark decays.

In this poster, we will present feasibility studies to suppress and/or measure the ccbar correlation contribution in the dielectron spectrum in Pb-Pb collisions. We make use of the large life time of the D mesons and therefore the large distance of closest approach (DCA) to the primary vertex of the charm decay electrons. We will show first results based on Monte Carlo studies with a complete simulation of the ALICE detector.