Double parton interactions in photon + 3 jet and photon + b/c jet + 2 jet events in ppbar collisions at sqrts=1.96 TeV
Abstract
We determine the fraction of events with double parton (DP) scattering in a single ppbar collision at sqrts=1.96 TeV in samples of photon + 3 jet and photon + b/c jet + 2 jet events collected with the D0 detector and corresponding to an integrated luminosity of about 8.7 fb-1. The DP fractions and effective cross sections (sigmaeff) are measured for both event samples using the same kinematic selections. The measured DP fractions range from 0.21 to 0.17, with effective cross sections in the photon + 3 jet and photon + b/c jet + 2 jet samples of sigmaeffincl = 12.7 +- 0.2 (stat) +- 1.3 (syst) mb and sigmaeffHF = 14.6 +- 0.6 (stat) +- 3.2 (syst) mb, respectively.
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