CERN Accelerating science

ATLAS Slides
Report number	ATL-PHYS-SLIDE-2010-231
Title	Evidence for Prompt Photon Production in pp Collisions at $\sqrt{s}= 7 TeV$ with the ATLAS Detector
Author(s)	Tojo, J (KEK, Tsukuba)
Collaboration	ATLAS collaboration
Submitted to	35th International Conference on High Energy Physics, Paris, France, 22 - 28 Jul 2010
Submitted by	[email protected] on 04 Aug 2010
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; ATLAS
Free keywords	egamma ; prompt photon ; EGAMMA
Abstract	Photon identification is important for many physics signatures at the LHC, as well as for detector calibration purposes. Prompt photon identification in ATLAS relies on the fine granularity of the electromagnetic calorimeter, which provides event by event rejection of the dominant background from photons from pi^0 decays, and on the inner detector, which allows us to reconstruct photon conversions to electron-positron pairs. The cross-section of prompt photon production at LHC is large enough that only a small integrated luminosity is required to produce a significant number of signal events. This contribution describes the extraction of the prompt photon signal above the background in the early LHC data with the ATLAS detector collected at a center of mass energy of 7 TeV.