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

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arxiv 1204.1319 v2 pith:ODNFUVCX submitted 2012-04-05 hep-ph hep-exnucl-exnucl-th

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

Jamal Jalilian-Marian , Amir H. Rezaeian This is my paper
classification hep-ph hep-exnucl-exnucl-th
keywords productionphotonphoton-hadronpromptcollisionscorrelationsrhicazimuthal
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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.

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Cited by 1 Pith paper

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  1. Probing Saturation Effect in Heavy Meson Pair Correlation in Forward $pA$ Collisions

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    Heavy meson pair correlations in forward pA collisions are computed in the CGC framework with Sudakov resummation, reproducing LHCb data and showing a mass hierarchy in R_pA that strengthens at higher rapidity.