Indico has been upgraded to version 3.1. Details in the SSB

# 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 isolated photons in p–Pb collisions at 5.02 TeV with the EMCal detector in 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

Erwann Masson (Subatech, IN2P3-CNRS (FR))

### Description

In high energy hadron collisions, direct photons can be produced at different stages and are of particular interest to study the hot QCD medium since they escape it without being affected.

At high transverse momentum ($p_{\text{T}}$), these photons may come from hard scattering processes (prompt photons) and from high $p_{\text{T}}$ parton fragmentation. Their measurement in proton-proton collisions allows to test pQCD and to put constraints on parton distribution functions. In proton-ion collisions (e.g., p–Pb), measuring direct photons enables to study cold nuclear effects and especially access nuclear parton distribution functions (nPDF). Their knowledge is crucial to understand the direct photon production in a context of hot nuclear matter where other mechanisms occur in addition.

One can access prompt photons experimentally with an isolation procedure. The isolated photon production in p–Pb collisions at $\sqrt{s_{\text{NN}}} = 5.02\,\text{TeV}$ measured with the ALICE ElectroMagnetic Calorimeter (EMCal) will be discussed in this poster.

Collaboration ALICE Experiment Presenter name already specified

### Primary author

Erwann Masson (Subatech, IN2P3-CNRS (FR))