Double parton interactions in photon+3 jet events in ppbar collisions sqrt{s}=1.96 TeV

Details Double parton interactions in photon+3 jet events in ppbar collisions sqrt{s}=1.96 TeV Double parton interactions in photon+3 jet events in ppbar collisions sqrt{s}=1.96 TeV

2009-12-27

arxiv.org/abs/0912.5104v2

Phys.Rev.D81:052012,2010

Physics

High Energy Physics

High Energy Physics - Experiment

15 pages, 13 figures

Scientific paper

10.1103/PhysRevD.81.052012

We have used a sample of photon+3 jets events collected by the D0 experiment with an integrated luminosity of about 1 fb^-1 to determine the fraction of events with double parton scattering (f_DP) in a single ppbar collision at sqrt{s}=1.96 TeV. The DP fraction and effective cross section (sigma_eff), a process-independent scale parameter related to the parton density inside the nucleon, are measured in three intervals of the second (ordered in pT) jet transverse momentum pT_jet2 within the range 15 < pT_jet2 < 30 GeV. In this range, f_DP varies between 0.23 < f_DP < 0.47, while sigma_eff has the average value sigma_eff_ave = 16.4 +- 0.3(stat) +- 2.3(syst) mb.

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