# Quark Matter 2018

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

## Direct virtual photons production in minimum-bias and high-multiplicity pp collisions at sqrt(s) = 13 TeV at the LHC with ALICE

15 May 2018, 17:00
2h 40m
First floor and third floor (Palazzo del Casinò)

### First floor and third floor

#### Palazzo del Casinò

Poster Electromagnetic and weak probes

### Speaker

Oton Vazquez Doce (Technische Universitaet Muenchen (DE))

### Description

Dielectrons produced in ultra-relativistic heavy-ion collisions provide a unique probe of the system evolution as they are unperturbed by final-state interactions. Among the different physics sources of dielectrons, thermal radiation in the form of real and virtual photons is of particular interest as it carries information about the temperature of the hot and dense system created in such collisions.

In heavy-ion collisions, the very low dielectron mass region ($m_{\rm ee} < 0.3 GeV/c^2$) provides information on the temperature of the system via the measurement of thermal radiation in the form of quasi-real virtual photons.Recently, one has observed collective phenomena in high-multiplicity pp collisions that are similar to the ones observed in heavy-ion collisions. If such collisions produce a thermalised system, it should emit thermal radiation as well.

We present the status for the search of such radiation in high-multiplicity pp collisions together with a vacuum reference measurement in minimum bias pp collisions at $\sqrt{s}$ = 13 TeV.

Centralised submission by Collaboration Presenter name already specified Experiment ALICE

### Primary author

Oton Vazquez Doce (Technische Universitaet Muenchen (DE))