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

TL;DR

This paper investigates azimuthal and transverse momentum correlations in proton-proton collisions at RHIC, incorporating novel subprocesses within the $k_t$-factorization framework and analyzing the dependence on different gluon/parton distributions.

Contribution

It introduces for the first time certain $k_t$-factorization subprocesses and compares results using various unintegrated gluon/parton distributions.

Findings

Collinear NLO $2 o 3$ processes dominate at small azimuthal angles.

Results vary significantly depending on the choice of UGDF/UPDF.

Inclusion of new subprocesses enhances the understanding of jet and photon correlations.

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.