# Quark Matter 2018

May 13 – 19, 2018
Venice, Italy
Europe/Zurich timezone
The organisers warmly thank all participants for such a lively QM2018! See you in China in 2019!

## Measurement of low-mass dielectrons in minimum-bias and high-multiplicity pp collisions at 13 TeV with ALICE

May 15, 2018, 5:00 PM
2h 40m
First floor and third floor (Palazzo del Casinò)

### First floor and third floor

#### Palazzo del Casinò

Poster Electromagnetic and weak probes

### Speaker

Ivan Vorobyev (Technische Universitaet Muenchen (DE))

### Description

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.

Measurements of dielectron production in minimum-bias proton-proton collisions provide an important vacuum reference for any modifications observed in heavy-ion collisions. Moreover, the measurement of e$^{+}$e$^{-}$ pairs from semi-leptonic decays of correlated heavy-flavour hadrons in the intermediate-mass region (1.2 < mee < 2.9 GeV/$c^{2}$) allow further studies and understandings of the primordial heavy-flavour production. Finally, 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 poster we present the latest results of the dielectron analysis with ALICE in pp collisions at $\sqrt{s}=13$ 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.

Collaboration ALICE Experiment Presenter name already specified

### Primary author

Ivan Vorobyev (Technische Universitaet Muenchen (DE))