Dresden 2013 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 29: Schwerionenkollisionen und QCD Phasen
HK 29.4: Vortrag
Dienstag, 5. März 2013, 15:00–15:15, HSZ-201
Electron Trigger with the ALICE TRD — •Uwe Westerhoff — WWU Münster
Electrons are an important probe to investigate the properties of pp, p-Pb and Pb-Pb collisions.
One source of electrons are the semi-leptonic decays of heavy-flavour hadrons (open charm and beauty). The measurement of these hadrons can be used to test predictions of pertubative QCD. To get a sufficiently large sample of these particles at high transverse momenta, an electron trigger is required.
The J/ψ is an important particle to study proton-proton collisions as well as to investigate the properties of the quark-gluon plasma created in lead-lead collisions. One option to measure this particle is via the decay channel J/ψ → e+ e− . Due to the rather low mass of 3.1 GeV/c2 of the J/ψ, an electron trigger with a low transverse momentum threshold is required.
The Transition Radiation Detector (TRD) of the ALICE experiment can provide these triggers. We will report on the mode of operation for the electron triggers and their performance in proton-proton collisions at √s= 8 TeV.