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HK: Fachverband Physik der Hadronen und Kerne

HK 33: Schwerionenkollisionen und QCD Phasen

HK 33.4: Vortrag

Mittwoch, 19. März 2014, 17:30–17:45, HZ 6

Prospects of Low-Mass Dielectron Measurements in ALICE with an upgraded Central Barrel Detector — •Carsten Klein for the ALICE collaboration — Institut für Kernphysik, Goethe-Universität Frankfurt

The measurement of electron-positron pairs in the low invariant mass region allows to study vacuum and in-medium properties of light vector mesons. Dielectrons also probe the production of thermal photons in heavy-ion collisions. ALICE is well-suited to perform this measurement due to its tracking and particle identification capabilities at very low momenta. However, Dalitz decays and photon conversions lead to a high combinatorial background. Additionally, coincident semi-leptonic decays of charm and anti-charm hadrons produce a continuum signal, which dominates over the thermal dielectron signal. Both contributions can be reduced by an upgraded Inner Tracking System (ITS), to be installed during LHC’s long shutdown 2 (2018). It will further improve the tracking efficiency at low p_T and provide detection capabilities for electrons from secondary vertices like conversions and heavy-quark decays. A simulation with the final design for an upgraded ITS was carried out. Our prediction of the impact on the low-mass dielectron measurement in Pb-Pb collisions at full LHC energy will be presented.
Supported by BMBF and the Helmholtz Association.