Dijet Azimuthal Decorrelations in Proton-Proton Collisions at a Center of Mass Energy of 7 TeV

Measurements of dijet azimuthal decorrelations for central rapidities in pp collisions at a center of mass energy of 7 TeV using the CMS detector at the CERN LHC are presented. The analysis is based on an inclusive dijet event sample corresponding to an integrated luminosity of 2.9/pb. The results are compared to predictions from perturbative QCD calculations and various MC event generators. The dijet azimuthal distributions are found to be sensitive to initial-state gluon radiation.