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Article Dans Une Revue European Physical Journal C: Particles and Fields Année : 2014

Measurement of differential cross sections for the production of a pair of isolated photons in pp collisions at sqrt(s) = 7 TeV

S. Chatrchyan , M. Besançon (1) , F. Couderc (1) , M. Dejardin (1) , D. Denegri (1) , B. Fabbro (1) , J.L. Faure (1) , F. Ferri , S. Ganjour (1) , A. Givernaud (1) , P. Gras (1) , G. Hamel De Monchenault (1) , P. Jarry (1) , E. Locci (1) , J. Malcles (1) , A. Nayak (1) , J. Rander (1) , A. Rosowsky (1) , M. Titov (1) , S. Baffioni (2) , F. Beaudette (2) , P. Busson (2) , C. Charlot (2) , N. Daci (2) , T. Dahms (2) , M. Dalchenko (2) , L. Dobrzynski (2) , N. Filipovic (2) , A. Florent (2) , R. Granier De Cassagnac (2) , L. Mastrolorenzo (2) , P. Miné (2) , C. Mironov (2) , I.N. Naranjo (2) , M. Nguyen (2) , C. Ochando (2) , P. Paganini (2) , D. Sabes (2) , R. Salerno (2) , J.B. Sauvan (2) , Y. Sirois (2) , C. Veelken (2) , Y. Yilmaz (2) , A. Zabi (2) , J.-L. Agram (3) , J. Andrea (3) , D. Bloch (3) , J.-M. Brom (3) , E.C. Chabert (3) , C. Collard (3) , E. Conte (3) , F. Drouhin (3) , J.-C. Fontaine (3) , D. Gelé (3) , U. Goerlach (3) , C. Goetzmann (3) , P. Juillot (3) , A.-C. Le Bihan (3) , P. Van Hove (3) , S. Gadrat (4) , S. Beauceron (5) , N. Beaupere (5) , G. Boudoul (5) , S. Brochet (5) , C.A. Carrillo Montoya (5) , J. Chasserat (5) , R. Chierici (5) , D. Contardo (5) , P. Depasse (5) , H. El Mamouni (5) , J. Fan , J. Fay (5) , S. Gascon (5) , M. Gouzevitch (5) , B. Ille (5) , T. Kurca (5) , M. Lethuillier (5) , L. Mirabito (5) , S. Perries (5) , J.D. Ruiz Alvarez , L. Sgandurra (5) , V. Sordini (5) , M. Vander Donckt (5) , P. Verdier (2) , S. Viret (5) , H. Xiao (5)
S. Chatrchyan
  • Fonction : Auteur
F. Ferri
  • Fonction : Auteur
P. Busson
R. Granier De Cassagnac
C. Mironov
P. Paganini
J.-L. Agram
C. Collard
E. Conte
D. Contardo
J. Fan
  • Fonction : Auteur
M. Gouzevitch
M. Lethuillier
J.D. Ruiz Alvarez
  • Fonction : Auteur
V. Sordini
P. Verdier

Résumé

A measurement of differential cross sections for the production of a pair of isolated photons in proton-proton collisions at sqrt(s) = 7 TeV is presented. The data sample corresponds to an integrated luminosity of 5.0 inverse femtobarns collected with the CMS detector. A data-driven isolation template method is used to extract the prompt diphoton yield. The measured cross section for two isolated photons, with transverse energy above 40 and 25 GeV respectively, in the pseudorapidity range abs(eta) < 2.5, abs(eta) not in [1.44,1.57] and with an angular separation Delta R > 0.45, is 17.2 +/- 0.2 (stat.) +/- 1.9 (syst.) +/- 0.4 (lum.) pb. Differential cross sections are measured as a function of the diphoton invariant mass, the diphoton transverse momentum, the azimuthal angle difference between the two photons, and the cosine of the polar angle in the Collins-Soper reference frame of the diphoton system. The results are compared to theoretical predictions at leading, next-to-leading, and next-to-next-to-leading order in quantum chromodynamics.

Dates et versions

in2p3-01110956 , version 1 (29-01-2015)

Identifiants

Citer

S. Chatrchyan, M. Besançon, F. Couderc, M. Dejardin, D. Denegri, et al.. Measurement of differential cross sections for the production of a pair of isolated photons in pp collisions at sqrt(s) = 7 TeV. European Physical Journal C: Particles and Fields, 2014, 74, pp.3129. ⟨10.1140/epjc/s10052-014-3129-3⟩. ⟨in2p3-01110956⟩
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