# Europhysics Conference on High-Energy Physics 2011

Jul 20 – 27, 2011
Alpes Congrès - Alpexpo
Europe/Paris timezone

## Measurement of the Cross Section for Prompt Isolated Diphoton Production in p\bar p Collisions at \sqrt{s} = 1.96 TeV.

Jul 23, 2011, 9:45 AM
15m
Bayard (Alpes Congrès - Alpexpo)

### Bayard

#### Alpes Congrès - Alpexpo

Parallel session talk QCD

### Speaker

Dr Costas Vellidis (Fermilab)

### Description

We report a measurement of the cross section of prompt isolated photon pair production in ppbar collisions at a total CM energy of 1.96 TeV using data of 5.4/fb integrated luminosity collected with the CDF II detector at the Fermilab Tevatron. The measured differential cross section is compared with three perturbative QCD predictions, a Leading Order (LO) parton shower Monte Carlo and two Next-to-Leading Order (NLO) calculations. The NLO calculations reproduce most aspects of the data. By including photon radiation from quarks before and after hard scattering, the parton shower Monte Carlo becomes competitive with the NLO predictions.

### Primary author

Dr Christina Mesropian (The Rockefeller University)

 Slides