Abstract
A phenomenological study of the isolated photon production in high energy $pp$ and $pA$ collisions at RHIC and LHC energies is performed. Using the color dipole approach we investigate the production cross section differential in the transverse momentum of the photon considering three different phenomenological models for the universal dipole cross section. We also present the predictions for the rapidity dependence of the ratio of $pA$ to $pp$ cross sections. As a further test of the formalism, for different energies and photon rapidites we analyse the correlation function in azimuthal angle $\Delta\phi$ between the photon and a forward pion. The characteristic double-peak structure of the correlation function around $\Delta \phi\simeq \pi$ observed previously for Drell-Yan pair production is found for isolated photon emitted into the forward rapidity region which can be tested by future experiments.
Highlights
The isolated photon production in pp and pA high-energy collisions represents an attractive and clean probe for strong interactions in soft [1,2,3] and perturbative regimes of quantum chromodynamics (QCD) [4,5,6] as well as nuclear effects and medium-induced QCD phenomena [7,8,9]
The characteristic double-peak structure of the correlation function around Δφ ≃ π observed previously for Drell-Yan pair production is found for an isolated photon emitted into the forward rapidity region which can be tested by future experiments
III, we present our numerical results for the transverse momentum distributions of the produced isolated photon as well as the pA-to-pp ratio of the production cross sections
Summary
The isolated (prompt) photon production in pp and pA high-energy collisions represents an attractive and clean probe for strong interactions in soft [1,2,3] and perturbative regimes of quantum chromodynamics (QCD) [4,5,6] as well as nuclear effects and medium-induced QCD phenomena [7,8,9]. The prompt photon production in hadron-hadron and hadron-nucleus collisions can be employed to set further constraints on parton density functions (PDFs) in specific kinematic domains not sufficiently well explored by HERA [10,11,12] For this purpose, such studies are in the focus of ongoing and planned measurements at the LHC [2,13,14,15,16] and at RHIC [3,17,18,19,20,21]
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