Artigo
Measurement of the differential cross section for isolated prompt photon production in pp collisions at 7 TeV
Fecha
2011-09-29Registro en:
Physical Review D. College Pk: Amer Physical Soc, v. 84, n. 5, p. 29, 2011.
1550-7998
10.1103/PhysRevD.84.052011
WOS:000306432100003
WOS000306432100003.pdf
Autor
Yerevan Phys Inst
Inst Hochenergiephys OeAW
Natl Ctr Particle & High Energy Phys
Univ Antwerp
Vrije Univ Brussel
Univ Libre Brussels
Univ Ghent
Catholic Univ Louvain
Univ Mons
Centro Brasileiro de Pesquisas Físicas (CBPF)
Univ Estado Rio de Janeiro
Joint Inst Nucl Res
Petersburg Nucl Phys Inst
Russian Acad Sci
Institute for Theoretical and Experimental Physics (ITEP)
Moscow MV Lomonosov State Univ
PN Lebedev Phys Inst
State Res Ctr Russian Federat
University of Belgrade
Vinca Inst Nucl Sci
CIEMAT
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Resumen
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 of 7 TeV is presented. The data sample corresponds to an integrated luminosity of 36 pb(-1) recorded by the CMS detector at the LHC. The measurement covers the pseudorapidity range vertical bar eta vertical bar < 2.5 and the transverse energy range 25 < E-T < 400 GeV, corresponding to the kinematic region 0.007 < x(T) < 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 E-T in four pseudorapidity regions. The next-to-leading-order perturbative QCD calculations are consistent with the measured cross section.