Münster 2017 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 3: Heavy Ion Collisions and QCD Phases II

HK 3.7: Vortrag

Montag, 27. März 2017, 18:30–18:45, F 3

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 ultra-relativistic heavy-ion collisions. Since they are created during all stages of the collision and do not interact strongly, they carry information about the medium properties unperturbed by strong final-state effects allowing us to probe the whole space-time evolution of the system.

Measurements of dielectron production in pp collisions serves as important vacuum reference to quantify modifications observed in heavy-ion collisions. It also provides complementary information on heavy-flavour production via correlated semi-leptonic decays. Recent studies of pp collisions with high charged-particle multiplicities showed surprising results similar to the observations previously seen in heavy-ion collisions. Measurements of low-mass dielectrons could provide additional information regarding the underlying physics processes.

In this talk we present the current status of the dielectron analysis with ALICE central barrel in pp collisions at a centre-of-mass energy of 13 TeV. A particular focus of the discussion will be put on the dielectron production in pp collisions collected with a trigger on high charged-particle multiplicities.

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