Azimuthal decorrelations and multiple parton interactions in $\gamma$+2 jet and $\gamma$+3 jet events in $p\bar{p}$ collisions at $\sqrt{s}=1.96$ TeV

The D0 collaboration
Phys.Rev.D 83 (2011) 052008, 2011.

Abstract (data abstract)
Fermilab Tevatron. Measurements of the distributions of the azimuthal decorrelation variables DELTA(S) and DELTA(PHI) in samples of inclusive GAMMA+3JETS and GAMMA+2JETS from proton-antiproton collisions at a centre-of-mass energy of 1.96 TeV. The data sample has an integrated luminosity of about 1 FB-1. In the 3JETS sample DELTA(S) is the azimuthal angle between the PT vector of the leading GAMMA+JET system and the PT sum of the other two jets. Similarily in the 2JET sample DELTA(PHI) is the azimuthal angle between the PT vector of the leading GAMMA+JET system and the other jet PT vector.

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