Measurement of the production cross section of an isolated photon associated with jets in proton-proton collisions at s√=7 TeV with the ATLAS detector

Barton, Adam and Borissov, Guennadi and Bouhova-Thacker, Eva and Brodbeck, Timothy and Chilingarov, Alexandre and Davidson, Ruth and de Mora, Lee and Dearnaley, William and Fox, Harald and Henderson, Robert and Hughes, Gareth and Jones, Roger William Lewis and Kartvelishvili, Vakhtang and Long, Robin and Love, Peter and Ratoff, Peter and Smizanska, Maria and Walder, James (2012) Measurement of the production cross section of an isolated photon associated with jets in proton-proton collisions at s√=7  TeV with the ATLAS detector. Physical Review D, 85 (9). ISSN 1550-7998

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Abstract

A measurement of the cross section for the production of an isolated photon in association with jets in proton-proton collisions at a center-of-mass energy s√=7  TeV is presented. Photons are reconstructed in the pseudorapidity range |ηγ|<1.37 and with a transverse energy EγT>25  GeV. Jets are reconstructed in the rapidity range |yjet|<4.4 and with a transverse momentum pjetT>20  GeV. The differential cross section dσ/dEγT is measured, as a function of the photon transverse energy, for three different rapidity ranges of the leading-pT jet: |yjet|<1.2, 1.2≤|yjet|<2.8 and 2.8≤|yjet|<4.4. For each rapidity configuration the same-sign (ηγyjet≥0) and opposite-sign (ηγyjet<0) cases are studied separately. The results are based on an integrated luminosity of 37  pb−1, collected with the ATLAS detector at the LHC. Next-to-leading order perturbative QCD calculations are found to be in fair agreement with the data, except for EγT≲45  GeV, where the theoretical predictions overestimate the measured cross sections.

Item Type:
Journal Article
Journal or Publication Title:
Physical Review D
Additional Information:
Published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. © 2012 CERN, for the ATLAS Collaboration
ID Code:
68163
Deposited By:
Deposited On:
20 Dec 2013 00:07
Refereed?:
Yes
Published?:
Published
Last Modified:
31 Mar 2020 02:56