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 Z. 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 E. Busato 5 D. Calvet 5 S. Calvet 5 R. Camacho Toro 5 Diane Cinca 6 J. Donini 5 Ph. Gris 5 N. Ghodbane 5 C. Guicheney 5 H. Liao 5 D. Pallin 5 D. Paredes Hernandez 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
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.
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Journal articles
Journal of High Energy Physics, Institute of Physics (IOP), 2013, 1, pp.086. <10.1007/JHEP01(2013)086>


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Submitted on : Friday, November 9, 2012 - 8:00:11 AM
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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, Institute of Physics (IOP), 2013, 1, pp.086. <10.1007/JHEP01(2013)086>. <in2p3-00750107>

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