Darmstadt 2016 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 10: Heavy Ion Collision and QCD Phases III

HK 10.2: Vortrag

Montag, 14. März 2016, 17:00–17:15, S1/01 A01

Measurement of low-mass dielectrons in pp collisions at √s = 13 TeV with ALICE — •Ivan Vorobyev for the ALICE collaboration — Technische Universität München, Excellence Cluster Universe

Low-mass dielectrons are a unique experimental tool to investigate the hot and dense medium created in ultrarelativistic heavy-ion collisions. Electron-positron pairs are created during all stages of collision and do not interact strongly. Thus they carry important information unperturbed by strong final-state effects allowing us to probe the space-time evolution of the system including effects of chiral symmetry restoration.

Measurement of dielectron production in pp collisions serves as important vacuum reference to quantify modifications observed in heavy-ion collisions. In this talk we present the current status of dielectron measurements with ALICE central barrel spectrometer in pp collisions at centre-of-mass energies of 13 TeV collected during the LHC operation in 2015. Electrons are identified based on specific energy loss measurements in the Inner Tracking System (ITS) and the Time Projection Chamber (TPC) as well as time-of-flight information. Aspects of dielectron production in high-multiplicity pp collisions will also be discussed.