Prompt photon production and photon-hadron correlations at RHIC and the LHC from the Color Glass Condensate

Abstract

We investigate inclusive prompt photon and semi-inclusive prompt photon-hadron production in high energy proton-nucleus collisions using the Color Glass Condensate (CGC) formalism which incorporates non-linear dynamics of gluon saturation at small x via Balitsky-Kovchegov equation with running coupling. For inclusive prompt photon production, we rewrite the cross-section in terms of direct and fragmentation contributions and show that the direct photon (and isolated prompt photon) production is more sensitive to gluon saturation effects. We then analyze azimuthal correlations in photon-hadron production in high energy proton-nucleus collisions and obtain a strong suppression of the away-side peak in photon-hadron correlations at forward rapidities, similar to the observed mono-jet production in deuteron-gold collisions at forward rapidity at RHIC. We make predictions for the nuclear modification factor R_{p(d)A} and photon-hadron azimuthal correlations in proton(deuteron)-nucleus collisions at RHIC and the LHC at various rapidities.

18 pages, 16 figures; v2: 3 plots added. The version to appear in PRD

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• Parton distributions for the LHC
• The Color Glass Condensate
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Cited by in corpus (25)

• Mining for Gluon Saturation at Colliders
• Direct numerical solution of the coordinate space Balitsky-Kovchegov equation at next to leading order
• Single-inclusive particle production in proton-nucleus collisions at next-to-leading order in the hybrid formalism
• Forward $J/\psi$ production in proton-nucleus collisions at high energy
• CGC predictions for p+A collisions at the LHC and signature of QCD saturation
• The importance of kinematic twists and genuine saturation effects in dijet production at the Electron-Ion Collider
• Probing the small-$x$ nuclear gluon distributions with isolated photons at forward rapidities in p+Pb collisions at the LHC
• Semi-inclusive photon-hadron production in pp and pA collisions at RHIC and LHC
• One-Loop Corrections to Dihadron Production in DIS at Small $x$
• Single Inclusive Hadron Production in DIS at Small $x$: Next to Leading Order Corrections
• 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
• Prompt photon - jet angular correlations at central rapidities in p+A collisions
• Dihadron Production in DIS at Small $x$ at Next to Leading Order: Transverse Photons
• Diphoton production in high-energy p+A collisions
• TMD parton showers for associated $\gamma$+jet production in electron-proton collisions at high energies
• Direct quarkonium-plus-gluon production in DIS in the Color Glass Condensate
• Small-$x$ QCD evolution of $2n$ Wilson line correlator: the weak field limit
• Isolated photon production in $pp$ collisions at forward rapidities and high multiplicity events
• Color Glass Condensate meets High Twist Expansion
• Physics with high-luminosity proton-nucleus collisions at the LHC
• Predictions for photon-jet correlations at forward rapidities in heavy-ion collisions
• Testing the CGC in proton-lead collisions at the LHC
• Coherent energy loss effects in dihadron azimuthal angular correlations in Deep Inelastic Scattering at small $x$
• Diffractive vector meson production in ultraperipheral heavy ion collisions from the Color Glass Condensate