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

G. Aad; T. Abajyan; B. Abbott; Mogens Dam; Jørgen Beck Hansen; Peter Henrik Hansen; John Renner Hansen; Jørn Dines Hansen; Esben Bryndt Klinkby; Ask Emil Løvschall-Jensen; Nele Maria Philomena Boelaert; Simon Johann Franz Heisterkamp; Morten Dam Jørgensen; Sascha Mehlhase; Björn Stefan Nilsson; Troels Christian Petersen; Stefania Xella

doi:10.1007/JHEP01(2013)086

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

G. Aad, T. Abajyan, B. Abbott, Mogens Dam, Jørgen Beck Hansen, Peter Henrik Hansen, John Renner Hansen, Jørn Dines Hansen, Esben Bryndt Klinkby, Ask Emil Løvschall-Jensen, Nele Maria Philomena Boelaert, Simon Johann Franz Heisterkamp, Morten Dam Jørgensen, Sascha Mehlhase, Björn Stefan Nilsson, Troels Christian Petersen, Stefania Xella

Experimental Particle Physics

48 Citations (Scopus)

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 √s=7TeV . 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 (|η| < 1.37 and 1.52 < |η| < 2.37) and with an angular separation ΔR > 0.4, is 44.0_-4.2^+3.2 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.[Figure not available: see fulltext.]

Original language	English
Article number	086
Journal	Journal of High Energy Physics (Online)
Volume	2013
Issue number	1
ISSN	1126-6708
DOIs	https://doi.org/10.1007/JHEP01(2013)086
Publication status	Published - 1 Jan 2013

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Aad, G., Abajyan, T., Abbott, B., Dam, M., Hansen, J. B., Hansen, P. H., Hansen, J. R., Hansen, J. D., Klinkby, E. B., Løvschall-Jensen, A. E., Boelaert, N. M. P., Heisterkamp, S. J. F., Jørgensen, M. D., Mehlhase, S., Nilsson, B. S., Petersen, T. C., & Xella, S. (2013). Measurement of isolated-photon pair production in pp collisions at root s=7 TeV with the ATLAS detector. Journal of High Energy Physics (Online), 2013(1), [086]. https://doi.org/10.1007/JHEP01(2013)086

Aad, G, Abajyan, T, Abbott, B, Dam, M , Hansen, JB , Hansen, PH , Hansen, JR , Hansen, JD, Klinkby, EB, Løvschall-Jensen, AE, Boelaert, NMP, Heisterkamp, SJF, Jørgensen, MD, Mehlhase, S, Nilsson, BS, Petersen, TC & Xella, S 2013, 'Measurement of isolated-photon pair production in pp collisions at root s=7 TeV with the ATLAS detector', Journal of High Energy Physics (Online), vol. 2013, no. 1, 086. https://doi.org/10.1007/JHEP01(2013)086

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title = "Measurement of isolated-photon pair production in pp collisions at root s=7 TeV with the ATLAS detector",

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 √s=7TeV . 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 (|η| < 1.37 and 1.52 < |η| < 2.37) and with an angular separation ΔR > 0.4, is 44.0-4.2+3.2 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.[Figure not available: see fulltext.]",

author = "G. Aad and T. Abajyan and B. Abbott and Mogens Dam and Hansen, {J{\o}rgen Beck} and Hansen, {Peter Henrik} and Hansen, {John Renner} and Hansen, {J{\o}rn Dines} and Klinkby, {Esben Bryndt} and L{\o}vschall-Jensen, {Ask Emil} and Boelaert, {Nele Maria Philomena} and Heisterkamp, {Simon Johann Franz} and J{\o}rgensen, {Morten Dam} and Sascha Mehlhase and Nilsson, {Bj{\"o}rn Stefan} and Petersen, {Troels Christian} and Stefania Xella",

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AU - Aad, G.

AU - Abajyan, T.

AU - Abbott, B.

AU - Dam, Mogens

AU - Hansen, Jørgen Beck

AU - Hansen, Peter Henrik

AU - Hansen, John Renner

AU - Hansen, Jørn Dines

AU - Klinkby, Esben Bryndt

AU - Løvschall-Jensen, Ask Emil

AU - Boelaert, Nele Maria Philomena

AU - Heisterkamp, Simon Johann Franz

AU - Jørgensen, Morten Dam

AU - Mehlhase, Sascha

AU - Nilsson, Björn Stefan

AU - Petersen, Troels Christian

AU - Xella, Stefania

PY - 2013/1/1

Y1 - 2013/1/1

N2 - 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 √s=7TeV . 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 (|η| < 1.37 and 1.52 < |η| < 2.37) and with an angular separation ΔR > 0.4, is 44.0-4.2+3.2 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.[Figure not available: see fulltext.]

AB - 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 √s=7TeV . 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 (|η| < 1.37 and 1.52 < |η| < 2.37) and with an angular separation ΔR > 0.4, is 44.0-4.2+3.2 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.[Figure not available: see fulltext.]

U2 - 10.1007/JHEP01(2013)086

DO - 10.1007/JHEP01(2013)086

M3 - Journal article

SN - 1126-6708

VL - 2013

JO - Journal of High Energy Physics (Online)

JF - Journal of High Energy Physics (Online)

IS - 1

M1 - 086

ER -

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

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