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Journal Articles Journal of High Energy Physics Year : 2013

Measurement of isolated-photon pair production in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector

G. Aad , S. Albrand (1) , M.L. Andrieux (1) , Q. Buat (1) , B. Clement (1) , J. Collot (1) , S. Crépé-Renaudin (1) , B. Dechenaux (1) , T. Delemontex (1) , P.A. Delsart (1) , M.H. Genest (1) , J.Y. Hostachy (1) , E. Laisne (1) , F. Ledroit-Guillon (1) , A. Lleres (1) , A. Lucotte (1) , F. Malek (1) , J. Stark (1) , X. Sun (1) , B. Trocmé (1) , C. Weydert (1) , C. Biscarat (2) , G. Rahal (2) , S. Abdel Khalek (3) , H. Abreu (3) , N. Andari (3) , C. Arnault (3) , E. Augé (3) , P. Barrillon (3) , M. Benoit (3) , S. Binet (3) , C. Bourdarios (3) , C. de La Taille (3) , J.B. de Vivie de Regie (3) , L. Duflot (3) , M. Escalier (3) , L. Fayard (3) , D. Fournier (3) , J.-F. Grivaz (3) , S. Henrot-Versillé (3) , J. Hrivnac (3) , L. Iconomidou-Fayard (3) , J. Idarraga (3) , M. Kado (3) , N. Lorenzo Martinez (3) , A. Lounis (3) , N. Makovec (3) , P. Matricon (3) , F. Niedercorn (3) , L. Poggioli (3) , P. Puzo (3) , A. Renaud (3) , D. Rousseau (3) , G. Rybkin (3) , J.B. Sauvan (3) , J. Schaarschmidt (3) , A.C. Schaffer (3) , L. Serin (3) , S. Simion (3) , R. Tanaka (3) , M. Teinturier (3) , J.J. Veillet (3) , I. Vukotic (3) , F. Wicek (3) , D. Zerwas (3) , Zhiqing Zhang (3) , L. Aperio Bella (4) , B. Aubert (4) , N. Berger (4) , J. Colas (4) , M. Delmastro (4) , L. Di Ciaccio (4) , T.K.O. Doan (4) , S. Elles (4) , C. Goy (4) , T. Hryn'Ova (4) , S. Jézéquel (4) , M. Kataoka (4) , J. Labbe (4) , R. Lafaye (4) , J. Leveque (4) , V.P. Lombardo (4) , N. Massol (4) , P. Perrodo (4) , E. Petit (4) , H. Przysiezniak (4) , E. Richter-Was (4) , G. Sauvage (4) , E. Sauvan (4) , M. Schwoerer (4) , T. Todorov (4) , D. Tsionou (4) , I. Wingerter-Seez (4) , R. Zitoun (4) , D. Boumediene (5) , Emmanuel Busato (5) , D. Calvet (5) , S. Calvet (5) , Reina Coromoto Camacho Toro (5) , Diane Cinca (6) , J. Donini (5) , Ph. Gris (5) , N. Ghodbane (5) , C. Guicheney (5) , H. Liao (5) , D. Pallin (5) , Daniela Paredes Hernández (5) , F. Podlyski (5) , C. Santoni (5) , F. Vazeille (5) , F. Vannucci (7) , S. Aoun (8) , C. P. Bee (8) , C. Bertella (8) , N. Bousson (8) , J. C. Clémens (8) , Y. Coadou (8) , F. Djama (8) , F. Etienne (8) , L. Feligioni (8) , D. Hoffmann (8) , F. Hubaut (8) , E. B. F. G. Knoops (8) , E. Le Guirriec (8) , B. Li (8) , J. Maurer (8) , E. Monnier (8) , J. Odier (8) , P. Pralavorio (8) , A. Rozanov (8) , M. Talby (8) , N. Tannoury (8) , E. Tiouchichine (8) , S. Tisserant (8) , J. Toth (8) , F. Touchard (8) , M. Ughetto (8) , L. Vacavant (8)
G. Aad
E. Augé
D. Rousseau
Zhiqing Zhang
  • Function : Author
  • PersonId : 829631
N. Berger
C. Goy
T. Hryn'Ova
S. Calvet
Diane Cinca
F. Vannucci
  • Function : Author
Y. Coadou

Abstract

The ATLAS experiment at the LHC has measured the production cross section of events with two isolated photons in the final state, in proton-proton collisions at sqrt(s) = 7 TeV. The full data set collected in 2011, corresponding to an integrated luminosity of 4.9 fb-1, is used. The amount of background, from hadronic jets and isolated electrons, is estimated with data-driven techniques and subtracted. The total cross section, for two isolated photons with transverse energies above 25 GeV and 22 GeV respectively, in the acceptance of the electromagnetic calorimeter (|eta|<1.37 and 1.52<|eta|<2.37) and with an angular separation Delta R>0.4, is 44.0 (+3.2) (-4.2) pb. The differential cross sections as a function of the di-photon invariant mass, transverse momentum, azimuthal separation, and cosine of the polar angle of the largest transverse energy photon in the Collins--Soper di-photon rest frame are also measured. The results are compared to the prediction of leading-order parton-shower and next-to-leading-order and next-to-next-to-leading-order parton-level generators.

Dates and versions

in2p3-00750107 , version 1 (09-11-2012)

Identifiers

Cite

G. Aad, S. Albrand, M.L. Andrieux, Q. Buat, B. Clement, et al.. Measurement of isolated-photon pair production in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector. Journal of High Energy Physics, 2013, 1, pp.086. ⟨10.1007/JHEP01(2013)086⟩. ⟨in2p3-00750107⟩
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