P Measurements of isolated prompt photons in pp collisions with the ATLAS detector

THE ATLAS COLL. , M. TRIPIANA; MARIA TERESA DOVA ET AL.

Conferencia; 2011 Europhysics Conference on High Energy Physics; 2011

We present the latest ATLAS measurement of the cross section for the inclusive production of isolated prompt photons of pp collisions at a centre-of-mass energy sqrts = 7 TeV, as well as the measurement of diphoton production. Photon candidates are identified by combining information from the calorimeters and from the inner tracker. Residual background in the selected sample is estimated from data, based on the observed distribution of the transverse isolation energy in a narrow cone around the photon candidate. The results are compared to predictions from next-to-leading order perturbative QCD calculations.