# Europhysics Conference on High-Energy Physics 2011

20-27 July 2011
Alpes Congrès - Alpexpo
Europe/Paris timezone

## Measurement of the Differential Isolated Prompt Photon Production Cross Section in pp Collisions at sqrt(s)= 7 TeV

23 Jul 2011, 09:00
15m
Bayard (Alpes Congrès - Alpexpo)

### Bayard

#### Alpes Congrès - Alpexpo

Parallel session talk QCD

### Speaker

Nicolas Pierre Chanon

### Description

A measurement of the differential cross section for the inclusive production of isolated prompt photons in proton-proton collisions at a center-of-mass energy sqrt(s)=7 TeV is presented. The data sample corresponds to an integrated luminosity of 36/pb recorded by the CMS detector at the LHC. Photons are required to have a pseudorapidity |η|<2.5 and ET>25 GeV. Photon candidates are identified by using the ratio of the energy measured in the electromagnetic calorimeter to momentum measured in the tracker for converted photons, and isolation measured in the tracker and calorimeters. The measured cross section is presented as a function of photon transverse energy ET in four pseudorapidity regions. It is compared with next-to-leading-order perturbative QCD calculations.

### Primary author

Dr Manfred Krammer (HEPHY, Vienna)

### Presentation Materials

 Transparents