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

Summary, in English

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 rapidities we analyze the correlation function in azimuthal angle Δφ between the photon and a forward pion. 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.

• Author: Victor P. Goncalves; Yuri Lima; Roman Pasechnik; Michal Šumbera
• Department/s: Theoretical Particle Physics - Has been reorganised
• Publishing year: 2020-05-01
• Language: English
• Publication/Series: Physical Review D
• Volume: 101
• Issue: 9
• Links: http://dx.doi.org/10.1103/PhysRevD.101.094019
• Document type: Journal article
• Publisher: American Physical Society
• Topic: Subatomic Physics
• Status: Published
• ISBN/ISSN/Other: ISSN: 2470-0010