Frankfurt 2014 – wissenschaftliches Programm
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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 pT 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.