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Measurement of the differential cross sections for isolated direct photon pair production in p(p)over-bar collisions at root s=1.96 TeV
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2013 (English)In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 725, no 1-3, 6-14 p.Article in journal (Refereed) Published
Abstract [en]

We present measurements of direct photon pair production cross sections using 8.5 fb(-1) of data collected with the D0 detector at the Fermilab Tevatron p (p) over bar collider. The results are presented as differential distributions of the photon pair invariant mass d sigma/dM(gamma gamma), pair transverse momentum d sigma/dp(T)(gamma gamma) azimuthal angle between the photons d sigma/d Delta(phi)(gamma gamma), and polar scattering angle in the Collins-Soper frame d sigma/d vertical bar cos theta*vertical bar. Measurements are performed for isolated photons with transverse momenta p(T)(gamma) > 18 (17) GeV for the leading (next-to-leading) photon in P-T, pseudorapidities vertical bar eta(gamma)vertical bar < 0.9, and a separation in eta-phi space Delta R-gamma gamma > 0.4. We present comparisons with the predictions from Monte Carlo event generators DIPHOX and RESBOS implementing QCD calculations at next-to-leading order, 2 gamma NNLO at next-to-next-to-leading order, and SHERPA using matrix elements with higher-order real emissions matched to parton shower. 

Place, publisher, year, edition, pages
2013. Vol. 725, no 1-3, 6-14 p.
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:uu:diva-206971DOI: 10.1016/j.physletb.2013.06.036ISI: 000322606800002OAI: oai:DiVA.org:uu-206971DiVA: diva2:646590
Available from: 2013-09-09 Created: 2013-09-09 Last updated: 2017-12-06Bibliographically approved

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