München 2019 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 48: Heavy-Ion Collisions and QCD Phases IX

HK 48.7: Vortrag

Donnerstag, 21. März 2019, 15:45–16:00, HS 15

Measurement of electrons from heavy-flavour hadron decays in pp collisions at √s = 8 TeV with ALICE at the LHC — •Regina Michel for the ALICE collaboration — GSI Helmholtzzentrum für Schwerionenforschung — Technische Universität Darmstadt

Measurements of heavy-flavour production in proton-proton collisions are important as a reference for measurements in heavy-ion collisions and to test perturbative Quantum Chromo Dynamics (pQCD). Heavy-flavour hadron production can be investigated via the measurement of electrons from their semileptonic decays. In ALICE electrons can be identified via their specific energy loss dE/dx in the Time Projection Chamber (TPC) and their time of flight measured by the Time of Flight detector (TOF). To determine the inclusive electron sample it is important to estimate the hadron contamination by applying different TOF cuts to the candidate sample after the dE/dx selection. The inclusive electron sample has a contribution from heavy-flavour decays but also a substantial background, which consists mainly of electrons coming from photon conversions and Dalitz decays of light neutral mesons. This background needs to be quantified and subtracted via the photonic-tagging method, which reduces the sample to the yield of electrons from semileptonic decay of heavy-flavour hadrons. The current status of the analysis will be presented and the results will be discussed in the context of pQCD calculations and in view of corresponding measurements in Pb-Pb collisions.