Photon-jet correlations and constraints on fragmentation functions

We study the production of a large-$p_T$ photon in association with a jet in proton-proton collisions. We examine the sensitivity of the jet rapidity distribution to the gluon distribution function in the proton. We then assess the sensitivity of various $\mathrm{\text{photon}}+\mathrm{\text{jet}}$ correlation observables to the photon fragmentation functions. We argue that RHIC data on photon-jet correlations can be used to constrain the photon fragmentation functions in a region which was barely accessible in LEP experiments.