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.

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

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