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Double parton interactions inγ+3jet events inpp¯collisions ats=1.96  TeV

Journal article published in 2010 by V. M. Abazov, B. Abbott, M. Abolins, B. S. Acharya, M. Adams, T. Adams, E. Aguilo, G. D. Alexeev, G. Alkhazov, A. Alton, G. Alverson, G. A. Alves, L. S. Ancu, M. Aoki, Y. Arnoud and other authors.
This paper is available in a repository.
This paper is available in a repository.

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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 pp̅ collision at √s=1.96 TeV. The DP fraction and effective cross section (σ 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 Τ ) jet transverse momentum p Τ jet2 within the range 15≤p Τ jet2 ≤30 GeV. In this range, f DP varies between 0.23≤f DP ≤0.47, while σ eff has the average value σ eff ave =16.4±0.3(stat)±2.3(syst) mb.