Darmstadt 2016 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 2: Heavy Ion Collision and QCD Phases I
HK 2.6: Talk
Monday, March 14, 2016, 15:30–15:45, S1/01 A01
Dielectron studies in Pb-Pb collisions with the ALICE experiment during the LHC Run-II — •Oton Vazquez Doce for the ALICE collaboration — Excellence Cluster Universe, TUM. Garching, Germany
Electromagnetic radiation is the ideal probe to study the formation of hot and dense matter in heavy ion collisions.
Real and virtual photons are produced in all the stages of the collision, allowing to study the whole system evolution. Moreover, electromagnetic radiation is transparent to the medium bringing information unaffected by final state interactions. By detecting photons and dileptons one can study the system temperature, via the extraction of thermal radiation, and the chiral symmetry restoration that is expected to happen in the deconfined phase via the modification of the spectral functions of vector mesons.
Dielectron studies in particular provide acces to the low pT region at colliders, allowing for a differential study in pT and invariant mass of the electron pair. In this presentation, the status of dielectron measurements in Pb-Pb collisions at centre-of-mass energies per nucleon pair of 5 TeV, recorded at the recent data taking period in December 2015, will be presented.
A study of a further low mass and pT acceptance increase for dielectron events in ALICE with a reduced magnetic field of 0.2T will be presented as well. Part of the future Pb-Pb run 3 data after the ALICE upgrade may be acquired with such a magnetic field configuration.