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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
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
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Number of Authors: 3036
2012 (English)In: Physical Review D, ISSN 1550-7998, E-ISSN 1550-2368, Vol. 85, no 9, 092014- p.Article in journal (Refereed) Published
Abstract [en]

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.
Keyword [en]
Deep-Inelastic Scattering, Gluon Distribution, Parton Distributions, Pp Collisions, Hera, Photoproduction, Collider, Nucleon, Events, Lhc
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-98422DOI: 10.1103/PhysRevD.85.092014ISI: 000304400000001Scopus ID: 2-s2.0-84861724352OAI: oai:DiVA.org:kth-98422DiVA: diva2:537211
Note

QC 20120626.

Available from: 2012-06-26 Created: 2012-06-26 Last updated: 2017-12-07Bibliographically approved

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Strandberg, Jonas

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