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 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.