Measurements of integrated and differential cross sections for isolated photon pair production in pp collisions at $\sqrt{s}=8$ TeV with the ATLAS detector

M. Aaboud N. Berger 1 A.M. Burger 1 M. Delmastro 1 L. Di Ciaccio 1 S. Elles 1 K. Grevtsov 1 T. Guillemin 1 T. Hryn’ova 1 S. Jézéquel 1 O. Kivernyk 1 I. Koletsou 1 R. Lafaye 1 Jérémy Lévêque 1 N. Lorenzo Martinez 1 P. Mastrandea 1 S. Raspopov 1 E. Sauvan 1 B.H. Smart 1 S. Todorova-Nova 1 A. Vallier 1 I. Wingerter-Seez 1 E. Yatsenko 1 S. Berlendis 2 C. Camincher 2 J. Collot 2 S. Crépé-Renaudin 2 P.A. Delsart 2 C. Gabaldon 2 M.H. Genest 2 J.Y. Hostachy 2 F. Ledroit-Guillon 2 A. Lleres 2 A. Lucotte 2 F. Malek 2 T. Meideck 2 E. Petit 2 N.P. Readioff 2 J. Stark 2 B. Trocmé 2 G. Aad 3 M. Alstaty 3 M. Barbero 3 A. Calandri 3 T.P. Calvet 3 Y. Coadou 3 K. de Vasconcelos Corga 3 C. Diaconu 3 F. Djama 3 R. El Kosseifi 3 V. Ellajosyula 3 L. Feligioni 3 A. Hadef 3 G.D. Hallewell 3 F. Hubaut 3 S.J. Kahn 3 E. B. F. G. Knoops 3 R. Kukla 3 E. Le Guirriec 3 K. Liu 3 D. Madaffari 3 E. Monnier 3 S. Muanza 3 E. Nagy 3 P. Pralavorio 3 Y. Rodina 3 A. Rozanov 3 M. Talby 3 T. Theveneaux-Pelzer 3 R.E. Ticse Torres 3 S. Tisserant 3 J. Toth 4, 3 F. Touchard 3 L. Vacavant 3 R. Wolff 3
1 LAPP/Laboratoire d'Annecy-le-Vieux de Physique des Particules - Laboratoire d'Annecy de Physique des Particules
2 LPSC - Laboratoire de Physique Subatomique et de Cosmologie
3 CPPM - Centre de Physique des Particules de Marseille
4 Wigner Research Centre for Physics [Budapest]
Abstract : A measurement of the production cross section for two isolated photons in proton--proton collisions at a center-of-mass energy of $\sqrt{s}=8$ TeV is presented. The results are based on an integrated luminosity of 20.2 fb$^{-1}$ recorded by the ATLAS detector at the Large Hadron Collider. The measurement considers photons with pseudorapidities satisfying $|\eta^{\gamma}|<1.37$ or ${1.56<|\eta^{\gamma}|<2.37}$ and transverse energies of respectively $E_{\mathrm{T,1}}^{\gamma}>40$ GeV and $E_{\mathrm{T,2}}^{\gamma}>30$ GeV for the two leading photons ordered in transverse energy produced in the interaction.The background due to hadronic jets and electrons is subtracted using data-driven techniques. The fiducial cross sections are corrected for detector effects and measured differentially as a function of six kinematic observables. The measured cross section integrated within the fiducial volume is $16.8 \pm 0.8$ pb. The data are compared to fixed-order QCD calculations at next-to-leading-order and next-to-next-to-leading-order accuracy as well as next-to-leading-order computations including resummation of initial-state gluon radiation at next-to-next-to-leading logarithm or matched to a parton shower, with relative uncertainties varying from 5% to 20%.
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Journal articles
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http://hal.in2p3.fr/in2p3-01507438
Contributor : Claudine Bombar <>
Submitted on : Thursday, April 13, 2017 - 10:47:04 AM
Last modification on : Tuesday, November 26, 2019 - 4:12:08 PM

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M. Aaboud, N. Berger, A.M. Burger, M. Delmastro, L. Di Ciaccio, et al.. Measurements of integrated and differential cross sections for isolated photon pair production in pp collisions at $\sqrt{s}=8$ TeV with the ATLAS detector. Physical Review D, American Physical Society, 2017, 95, pp.112005. ⟨10.1103/PhysRevD.95.112005⟩. ⟨in2p3-01507438⟩

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