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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

CollaborationWith : Abdelalim Aly, Ahmed Aly / Alexandre, Gauthier / Backes, Moritz / Barone, Gaetano / Bell, Paul / Bell, William / Benhar Noccioli, Eleonora / Blondel, Alain / Bucci, Francesca / Clark, Allan Geoffrey / Dao, Valerio / Doglioni, Caterina / Ferrere, Didier / Gadomski, Szymon / Gonzalez Sevilla, Sergio / Goulette, Marc / Iacobucci, Giuseppe / La Rosa, Alessandro / Leger, Annie / Lister, Alison / Martin Dit Latour, Bertrand / Mermod, Philippe / Mora Herrera, Maria Clemencia Rosario / Nektarijevic, Snezana / Nikolics, Katalin / Pasztor, Arpad / Pohl, Martin / Rosbach, Kilian / Rosselet, Laurent / Wu, Xin
Published in Physical Review. D. 2012, vol. 85, no. 09, p. 092014
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.
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ATLAS COLLABORATION. 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. In: Physical Review. D, 2012, vol. 85, n° 09, p. 092014. doi: 10.1103/PhysRevD.85.092014 https://archive-ouverte.unige.ch/unige:39764

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Deposited on : 2014-08-26

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