Double parton interactions in γ = 3 jet events in pp collisions at √s = 1.96 TeV

Authors

V. M. Abazov, Joint Institute for Nuclear Research, Dubna, Russia
Kenneth A. Bloom, University of Nebraska-LincolnFollow
Gregory Snow, University of Nebraska-LincolnFollow
D0 Collaboration

Date of this Version

2010

Comments

Published in PHYSICAL REVIEW D 81, 052012 (2010). Copyright © 2010 The American Physical Society. Used by permission.

Abstract

We have used a sample of γ + 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 pp collision at √s = 1.96 TeV. The DP fraction and effective cross section (τ_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_T) jet transverse momentum p^jet2_T within the range 15 ≤ p^jet2_T ≤ 30 GeV. In this range, f_DP varies between 0.23 ≤ f_DP ≤ 0.47, while σ_eff has the average value σ^ave _eff = 16.4 ± 0.3(stat) ± 2.3(syst) mb.