Measurement of the production cross section of an isolated photon associated with jets in proton-proton collisions at root s=7 TeV with the ATLAS detector
Number of Authors: 3036
2012 (English)In: Physical Review D, ISSN 1550-7998, Vol. 85, no 9, 092014- p.Article in journal (Refereed) Published
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 root s = 7 TeV is presented. Photons are reconstructed in the pseudorapidity range vertical bar eta(gamma)vertical bar < 1.37 and with a transverse energy E-T(gamma) > 25 GeV. Jets are reconstructed in the rapidity range vertical bar y(jet)vertical bar < 4.4 and with a transverse momentum p(T)(jet) > 20 GeV. The differential cross section d sigma/dE(T)(gamma) is measured, as a function of the photon transverse energy, for three different rapidity ranges of the leading-p(T) jet: vertical bar y(jet)vertical bar < 1.2, 1.2 <= vertical bar y(jet)vertical bar < 2.8 and 2.8 <= vertical bar y(jet)vertical bar < 4.4. For each rapidity configuration the same-sign (eta(gamma)y(jet) >= 0) and opposite-sign (eta(gamma) y(jet) < 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 E-T(gamma) <= 45 GeV, where the theoretical predictions overestimate the measured cross sections.
Place, publisher, year, edition, pages
2012. Vol. 85, no 9, 092014- p.
Deep-Inelastic Scattering, Gluon Distribution, Parton Distributions, Pp Collisions, Hera, Photoproduction, Collider, Nucleon, Events, Lhc
IdentifiersURN: urn:nbn:se:kth:diva-98422DOI: 10.1103/PhysRevD.85.092014ISI: 000304400000001ScopusID: 2-s2.0-84861724352OAI: oai:DiVA.org:kth-98422DiVA: diva2:537211
QC 20120626.2012-06-262012-06-262014-10-21Bibliographically approved