Dijet Azimuthal Decorrelations in \textit{pp

We present a study of dijet azimuthal decorrelations for central rapidities in \textit{pp} collisions at $\sqrt s$ = 10 TeV using the CMS detector. The event sample of the simulated data corresponds to 10 pb$^{-1}$ of integrated luminosity. The distributions are corrected back to the particle level, and the major sources of systematic uncertainties are discussed. Comparisons of the dijet azimuthal distributions from PYTHIA, HERWIG++, MADGRAPH, and perturbative QCD calculations are presented. The sensitivity of the dijet azimuthal distributions to the phenomenological parameters used to model initial and final-state radiation in PYTHIA are also investigated.