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Numrering	Referens	Omslagsbild	Hitta
1.	Abazov, V. M., et al. (författare) 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 2011 Ingår i: Physical Review D - Particles, Fields, Gravitation and Cosmology. - 1550-7998 .- 1550-2368. ; 83:5, s. 052008- Tidskriftsartikel (refereegranskat)abstract 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).
2.	Abazov, V. M., et al. (författare) Measurement of the differential cross sections for isolated direct photon pair production in p(p)over-bar collisions at root s=1.96 TeV 2013 Ingår i: Physics Letters B. - : Elsevier BV. - 0370-2693 .- 1873-2445. ; 725:1-3, s. 6-14 Tidskriftsartikel (refereegranskat)abstract 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.

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Typ av publikation: tidskriftsartikel (2)

Typ av innehåll: refereegranskat (2)

Författare/redaktör: Abbott, B. (2); Borissov, G. (2); Brandt, A. (2); Brandt, O. (2); Brock, R. (2); Burdin, S. (2); visa fler...; Chakraborty, D. (2); Cooke, M. (2); Denisov, S. P. (2); Enari, Y. (2); Evans, H. (2); Fiedler, F. (2); Filthaut, F. (2); Fox, H. (2); Grohsjean, A. (2); Gutierrez, P. (2); Han, L. (2); Hensel, C. (2); Hohlfeld, M. (2); Hubacek, Z. (2); Kehoe, R. (2); Khanov, A. (2); Kupco, A. (2); Lammers, S. (2); Li, L. (2); Liu, Y. (2); Lokajicek, M. (2); Meyer, J. (2); Nayyar, R. (2); Neal, H. A. (2); Nunnemann, T. (2); Penning, B. (2); Pleier, M. -A. (2); Price, D. (2); Qian, J. (2); Quadt, A. (2); Sanders, M. P. (2); Sawyer, L. (2); Scanlon, T. (2); Schamberger, R. D. (2); Schwanenberger, C. (2); Schwienhorst, R. (2); Severini, H. (2); Shabalina, E. (2); Simak, V. (2); Skubic, P. (2); Snyder, S. (2); Stark, J. (2); Strauss, M. (2); Tsybychev, D. (2); visa färre...

Lärosäte: Uppsala universitet (2); Stockholms universitet (1)

Språk: Engelska (2)

Forskningsämne (UKÄ/SCB): Naturvetenskap (1)

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