Heidelberg 2015 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 54: Heavy Ion Collisions and QCD Phases 7

HK 54.5: Vortrag

Donnerstag, 26. März 2015, 15:45–16:00, T/SR14

Elliptic Flow Measurement of Heavy-Flavour Decay Electrons in Pb-Pb Collisions at 2.76TeV with ALICE — •Theodor Rascanu for the ALICE collaboration — Goethe-Universität Frankfurt, Institut für Kernphysik, Max-von-Laue-Str. 1, 60438 Frankfurt am Main

In heavy-ion collisions, charm and beauty quarks are produced in initial hard scattering processes. They then propagate and interact strongly with the created medium, the Quark Gluon Plasma (QGP), and thus allow to probe its properties.

One way to measure heavy-quarks is via electrons from the semileptonic decays of open charm and beauty hadrons. At low transverse momentum, the level of thermalization of heavy quarks can be studied via the azimuthal anisotropy of the heavy flavour electron emission in the transverse plane, the elliptic flow v₂. At high p_T, v₂ provides insight on the path length dependence of parton energy-loss.

In this talk we present v₂ measurements of electrons from heavy flavour decays with the central barrel of ALICE at mid rapidity in Pb-Pb collisions at √s_NN = 2.76 TeV as function of the centrality of the collision. The electrons are identified using the Inner Tracking System, the Time-Of-Flight detector and Time Projection Chamber at low momenta, as well as the Electromagnetic Calorimeter at higher momenta.

We report on the performance of the electron identification and explain how the non-heavy flavour electron background is subtracted. Finally the results are compared to different theoretical models.