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Azimuthal decorrelations and multiple parton interactions in gamma+2 jet and gamma+3 jet events in p(p)over-bar collisions at root s=1.96 TeV
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2011 (English)In: Physical Review D - Particles, Fields, Gravitation and Cosmology, ISSN 1550-7998, Vol. 83, no 5, 052008- p.Article in journal (Refereed) Published
Abstract [en]

Samples of inclusive gamma + 2 jet and gamma + 3 jet events collected by the D0 experiment with an integrated luminosity of about 1 fb(-1) in p (p) over bar collisions at root s = 1.96 TeV are used to measure cross sections as a function of the angle in the plane transverse to the beam direction between the transverse momentum (p(T)) of the gamma + leading jet system (jets are ordered in p(T)) and p(T) of the other jet for gamma + 2 jet, or p(T) sum of the two other jets for gamma + 3 jet events. The results are compared to different models of multiple parton interactions (MPI) in the PYTHIA and SHERPA Monte Carlo (MC) generators. The data indicate a contribution from events with double parton (DP) interactions and are well-described by predictions provided by the PYTHIA MPI models with p(T)-ordered showers and by SHERPA with the default MPI model. The gamma + 2 jet data are also used to determine the fraction of events with DP interactions as a function of the azimuthal angle and as a function of the second jet p(T).

Place, publisher, year, edition, pages
2011. Vol. 83, no 5, 052008- p.
National Category
Physical Sciences
URN: urn:nbn:se:uu:diva-151648DOI: 10.1103/PhysRevD.83.052008ISI: 000288696400002OAI: oai:DiVA.org:uu-151648DiVA: diva2:411038
Available from: 2011-04-15 Created: 2011-04-15 Last updated: 2013-03-01Bibliographically approved

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