# Quark Matter 2019 - the XXVIIIth International Conference on Ultra-relativistic Nucleus-Nucleus Collisions

3-9 November 2019
Wanda Reign Wuhan Hotel
Asia/Shanghai timezone

## Nuclear modification factor of isolated photon production in pp and PbPb collisions at 5.02 TeV with the CMS detector

4 Nov 2019, 17:40
20m
Wanda Han Show Theatre & Wanda Reign Wuhan Hotel

#### Wanda Han Show Theatre & Wanda Reign Wuhan Hotel

Poster Presentation Initial state and approach to equilibrium

### Speaker

Yeonju Go for CMS Collaboration (Korea University (KR))

### Description

High-transverse-momentum prompt photons, as colorless objects, do not interact strongly with the medium and provide a direct way to test pQCD and the nuclear PDF. The transverse energy spectra and the nuclear modification factors of isolated photons are measured in pp and PbPb collisions at 5.02 TeV using the CMS detector. The data are compared to JETPHOX NLO calculations and found to be consistent with the prediction of the nuclear modification factor. The measurements significantly improve the accuracy compared to the previous CMS results at 2.76 TeV. No significant modification of isolated photon cross-sections in PbPb collisions with respect to pp collisions is observed in the pseudorapidity range $|\eta| < 1.44$ and $E_{T}$ between 25 to 200 GeV at various collision centralities.

### Primary author

Yeonju Go for CMS Collaboration (Korea University (KR))

### Presentation Materials

There are no materials yet.