Photon-jet correlations in hadronic collisions

TL;DR

This paper compares $k_t$-factorization and NLO collinear-factorization methods for photon-jet correlations in proton-proton and proton-antiproton collisions across RHIC, Tevatron, and LHC energies, highlighting the dependence on unintegrated parton distributions.

Contribution

It provides a comparative analysis of two theoretical approaches for photon-jet correlations, incorporating various unintegrated parton distributions in the $k_t$-factorization framework.

Findings

Results vary with different UPDFs used in $k_t$-factorization.

NLO collinear results are used as a benchmark for comparison.

Correlation patterns depend on the chosen theoretical approach.

Abstract

We compare results of $k_t$-factorization approach and next-to-leading order collinear-factorization approach for photon-jet correlations in $pp$ and $p \bar p$ collisions at RHIC, Tevatron and LHC energies. We discuss correlations in azimuthal angle as well as in two-dimensional space of transverse momenta of photon and jet. Different unintegrated parton distributions (UPDF) are included in the $k_t$-factorization approach. The results depend on UPDFs used. The results of NLO collinear-factorization are shown for comparison.