Isolated photon-hadron production in high energy $pp$ and $pA$ collisions at RHIC and LHC

Abstract

We compute the isolated photon production in association with a charged hadron at mid rapidity in $pp$ and $pA$ based on the Color Glass Condensate (CGC) framework of high energy QCD where, for the first time, we incorporate the Sudakov effect of soft gluon emissions. Our results are based on the leading order $qg\to q\gamma$ channel in the CGC framework and confronted with the recent data from RHIC and LHC concerning the angular distributions and out-of-plane transverse momentum distributions. We find that, while the CGC computation alone results in too narrow distributions, with the help of the Sudakov effect, we can get a satisfactory description of the data. With this as a benchmark, we provide predictions for the magnitude of the nuclear effect brought by the phenomena of gluon saturation in the CGC.

arXiv commentminor corrections, matches the published version

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• Back-to-back inclusive dijets in DIS at small $x$: Sudakov suppression and gluon saturation at NLO
• Harmonics of Parton Saturation in Lepton-Jet Correlations at the EIC
• Direct quarkonium-plus-gluon production in DIS in the Color Glass Condensate
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• Color Glass Condensate meets High Twist Expansion
• Description of di-hadron saturation signals within a universal nuclear parton distribution function approach
• Physics with high-luminosity proton-nucleus collisions at the LHC
• Predictions for photon-jet correlations at forward rapidities in heavy-ion collisions
• Hydrodynamic model of heavy-ion collisions with low momentum components