Bochum 2018 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 31: Heavy Ion Collisions and QCD Phases V

HK 31.6: Talk

Wednesday, February 28, 2018, 15:30–15:45, HZO 60

Measurement of low-mass dielectrons in minimum-bias and high-multiplicity pp collisions at 13 TeV with ALICE — •Ivan Vorobyev for the ALICE collaboration — Technische Universität München, Excellence Cluster Universe

Electron-positron pairs are a unique experimental tool to investigate the hot and dense medium created in ultra-relativistic heavy-ion collisions. Such pairs are produced during all stages of the collision and do not interact strongly. Therefore, they carry information about the medium properties and the whole space-time evolution of the system.

The studies of dielectron production in minimum-bias proton-proton collisions provide an important vacuum reference for any modifications observed in heavy-ion collisions. The measurement of dielectron pairs from semi-leptonic decays of correlated heavy-flavour hadrons allow further studies of the primordial heavy-flavour production. Recent studies of proton-proton collisions with high charged-particle multiplicities showed interesting results similar to the observations previously done in heavy-ion collisions. Measurements of low-mass dielectrons could provide further insight into the underlying physics processes.

In this talk we present the current status of the dielectron analysis with ALICE central barrel in pp collisions at 13 TeV. A particular focus of the discussion is put on the modification of dielectron spectrum in pp collisions collected with a trigger on high charged-particle multiplicities compared to the minimum-bias events.

This work is supported by BMBF and the DFG cluster of excellence "Origin and Structure of the Universe"