D0 results on diphoton direct production and double parton interactions in photon + 3 jet events

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We report the measurement of differential diphoton direct production cross sections and a study of photon + 3-jet events with double parton (DP) interactions, based on data taken with the D0 experiment at the Fermilab Tevatron proton-antiproton collider. We measure single differential cross sections as a function of the diphoton mass, the transverse momentum of the diphoton system, the azimuthal angle between the photons, and the polar scattering angle of the photons. In addition, we measure double differential cross sections considering the last three kinematic variables in three diphoton mass bins. The results are compared with different perturbative QCD predictions ... continued below

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6 pages

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Sawyer, Lee & U., /Louisiana Tech. January 1, 2010.

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We report the measurement of differential diphoton direct production cross sections and a study of photon + 3-jet events with double parton (DP) interactions, based on data taken with the D0 experiment at the Fermilab Tevatron proton-antiproton collider. We measure single differential cross sections as a function of the diphoton mass, the transverse momentum of the diphoton system, the azimuthal angle between the photons, and the polar scattering angle of the photons. In addition, we measure double differential cross sections considering the last three kinematic variables in three diphoton mass bins. The results are compared with different perturbative QCD predictions and event generators. We have used a sample of photon + 3-jet events collected by the D0 experiment with an integrated luminosity of about 1 fb{sup -1} to determine the fraction of events with double parton scattering (f{sub DP}) in a single p{bar p} collision at {radical}s = 1.96 TeV. The DP fraction and effective cross section ({sigma}{sub eff}), a process-independent scale parameter related to the parton density inside the nucleon, are measured in three intervals of the second (ordered in p{sub T}) jet transverse momentum p{sub T}{sup jet2} within the range 15 < p{sub T}{sup jet} < 30 GeV. In this range, f{sub DP} varies between 0.23 < f{sub DP} < 0.47, while {sigma}{sub eff} has the average value {sigma}{sub eff}{sup ave} = 16.4 {+-} 0.3(stat) {+-} 2.3(syst) mb.

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6 pages

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  • Journal Name: PoS DIS2010:134,2010; Conference: Prepared for 18th International Workshop on Deep Inelastic Scattering and Related Subjects (DIS 2010), Florence, Italy, 19-23 Apr 2010

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  • Report No.: FERMILAB-CONF-10-542-E
  • Grant Number: AC02-07CH11359
  • Office of Scientific & Technical Information Report Number: 1004300
  • Archival Resource Key: ark:/67531/metadc840357

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  • January 1, 2010

Added to The UNT Digital Library

  • May 19, 2016, 3:16 p.m.

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  • Nov. 23, 2016, 12:18 p.m.

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Sawyer, Lee & U., /Louisiana Tech. D0 results on diphoton direct production and double parton interactions in photon + 3 jet events, article, January 1, 2010; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc840357/: accessed December 11, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.