# Measurement of the Differential Cross Section for Isolated Prompt Photon Production in pp Collisions at 7 TeV

7 CMS
IP2I Lyon - Institut de Physique des 2 Infinis de Lyon
Abstract : A measurement of the differential cross section for the inclusive production of isolated prompt photons in proton-proton collisions at a centre-of-mass energy of 7 TeV is presented. The data sample corresponds to an integrated luminosity of 36 inverse picobarns recorded by the CMS detector at the LHC. The measurement covers the pseudorapidity range |eta|<2.5 and the transverse energy range 25 < ET < 400 GeV, corresponding to the kinematic region 0.007 < xT < 0.114. Photon candidates are identified with two complementary methods, one based on photon conversions in the silicon tracker and the other on isolated energy deposits in the electromagnetic calorimeter. The measured cross section is presented as a function of ET in four pseudorapidity regions. The next-to-leading-order perturbative QCD calculations are consistent with the measured cross section.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00624254
Contributor : Claudine Bombar <>
Submitted on : Friday, September 16, 2011 - 11:19:05 AM
Last modification on : Monday, June 28, 2021 - 3:56:02 PM

### Citation

S. Chatrchyan, D. Sillou, M. Besancon, S. Choudhury, M. Dejardin, et al.. Measurement of the Differential Cross Section for Isolated Prompt Photon Production in pp Collisions at 7 TeV. Physical Review D, American Physical Society, 2011, 84, pp.052011. ⟨10.1103/PhysRevD.84.052011⟩. ⟨in2p3-00624254⟩

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