# Initial Stages 2021

Jan 10 – 15, 2021
Weizmann Institute of Science
Asia/Jerusalem timezone
See you at IS2023 in Copenhagen in June 2023

## Dielectron production in pp and p-Pb collisions at sqrt(s_NN) = 5.02 TeV

Jan 11, 2021, 7:40 PM
1h 30m
Patio (vDLCC)

### Patio

#### vDLCC

bullet talk (poster) The initial stages of heavy-ion collisions

### Speaker

Horst Sebastian Scheid (Goethe University Frankfurt (DE))

### Description

Dileptons are a prime probe of the deconfined state of strongly interacting matter, the quark--gluon plasma (QGP), produced in high-energy heavy-ion collisions, as they are not affected by strong interactions after their creation.
A measurement of the thermal radiation from the QGP in the mass region between the $\phi$ and the $\rm J/\psi$ allows to estimate the medium temperature. In this region the main component of the dielectron continuum is originating from correlated semileptonic decays of open-charm and beauty hadrons.
The production of dielectrons originating from the decays of heavy-flavour hadrons in small systems can provide crucial insight for the measurement of thermal radiation in nucleus-nucleus collisions.

In this talk, the latest results on dielectron production in pp and p--Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeV will be presented.
We will discuss the production of heavy-flavour quarks in pp collisions compared with model predictions including different quark production mechanisms, as well as a possible modification of their production cross sections in p--Pb collisions. The data from both collision systems will be presented in terms of the dielectron nuclear modification factor $R_{\rm pPb}$.
Possible deviations from the vacuum baseline will be addressed in the light of present cold nuclear matter effects along with possible collective effects in small systems.

### Primary author

Horst Sebastian Scheid (Goethe University Frankfurt (DE))

### Presentation materials

 IS21_scheid_dielectrons.pdf VIDEO_scheid_IS2021.mp4