Isolated photon production and pion-photon correlations in high-energy $pp$ and $pA$ collisions

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 $\Delta \varphi$ between the photon and a forward pion. The characteristic double-peak structure of the correlation function around $\Delta \varphi \simeq \pi$ 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.

arXiv comment11 pages, 9 figures. Improved version to be published in Physical Review D

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Cited by in corpus (8)

• Mining for Gluon Saturation at Colliders
• Isolated photon-hadron production in high energy $pp$ and $pA$ collisions at RHIC and LHC
• Harmonics of Parton Saturation in Lepton-Jet Correlations at the EIC
• Inclusive prompt photon-jet correlations as a probe of gluon saturation in electron-nucleus scattering at small $x$
• Prompt photon production in proton collisions as a probe of parton scattering in high energy limit
• TMD parton showers for associated $\gamma$+jet production in electron-proton collisions at high energies
• Prompt photon production in high-energy $pA$ collisions at forward rapidity
• Isolated photon production in $pp$ collisions at forward rapidities and high multiplicity events