Dijet and photon-jet correlations in proton-proton collisions at RHIC

Abstract

We discuss correlations in azimuthal angle as well as correlations in two-dimensional space of transverse momenta of two jets as well as photon and jet. Some $k_t$-factorization subprocesses are included for the first time in the literature. Different unintegrated gluon/parton distributions are used in the $k_t$-factorization approach. The results depend on UGDF/UPDF used. The collinear NLO $2\to 3$ contributions dominate over $k_t$-factorization cross section at small relative azimuthal angles as well as for asymmetric transverse momentum configurations.

Comments: an invited talk at the Memorial Workshop on Hadronic and Quark Matter devoted to J.Zimanyi, Budapest, July 2-4, 2007