Münster 2017 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 3: Heavy Ion Collisions and QCD Phases II

HK 3.3: Vortrag

Montag, 27. März 2017, 17:30–17:45, F 3

Constraining HF production mechanisms with dielectrons — •Anisa Dashi for the ALICE collaboration — Technische Universität München, Exzellenzcluster Universe, Boltzmannstr. 2, D-85748 Garching

The continuum of electron-positron pairs, produced in heavy ion collisions, provides an excellent probe of quark-gluon plasma (QGP) formation. Since dielectron pairs are produced by different processes at all stages of the collision, their invariant mass spectrum contains various contributions, e.g. the intermediate mass region (1.2 to 2.8 GeV/c) is dominated by correlated semileptonic decays of open heavy flavour. From modifications of this region one can gain information about the effects of QGP on heavy quarks. This requires first, however, a good understanding of the relevance of the various heavy quarks production mechanisms. Heavy quarks are produced in leading order back to back through flavour creation in the initial hard scattering processes of the collision, but also higher order processes like flavour excitation and gluon splitting contribute to their production. This talk presents Monte Carlo simulation studies which aim to the separation of the different heavy flavour production mechanisms exploiting their different angular correlation in order to better understand their contribution to the dielectron mass spectrum. The analysis is performed for proton-proton collisions at 7 TeV, since a study of dielectrons in these collisions provides a crucial reference for the heavy ion data.

This work is supported by BMBF-FSP 202 and the Excellence Cluster Universe.