Artigo
Measurement of the production cross section for pairs of isolated photons in pp collisions at root s=7 TeV
Fecha
2012-01-01Registro en:
Journal of High Energy Physics. New York: Springer, n. 1, p. 145, 2012.
1126-6708
10.1007/JHEP01(2012)133
WOS:000300183300050
WOS000300183300050.pdf
Autor
Yerevan Phys Inst
Inst Hochenergiephys OeAW
Natl Ctr Particle & High Energy Phys
Univ Antwerp
Univ Libre Brussels
Univ Ghent
Catholic Univ Louvain
Univ Mons
Centro Brasileiro de Pesquisas Físicas (CBPF)
Universidade do Estado do Rio de Janeiro (UERJ)
Universidade Estadual Paulista (Unesp)
Universidade Federal do ABC (UFABC)
Suez Canal Univ
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British Univ
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Univ Haute Alsace
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Univ Cyprus
Soltan Inst Nucl Studies
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Lab Instrumentacao & Fis Expt Particulas
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Resumen
The integrated and differential cross sections for the production of pairs of isolated photons is measured in proton-proton collisions at a centre-of-mass energy of 7TeV with the CMS detector at the LHC. A data sample corresponding to an integrated luminosity of 36 pb(-1) is analysed. A next-to-leading-order perturbative QCD calculation is compared to the measurements. A discrepancy is observed for regions of the phase space where the two photons have an azimuthal angle difference Delta phi less than or similar to 2.8 rad.