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We present a detailed phenomenological study of direct photon production inassociation with a heavy-quark jet in pA collisions at the Relativistic HeavyIon Collider (RHIC) and at the Large Hadron Collider (LHC) at next-to-leadingorder in QCD. The dominant contribution to the cross-section comes from thegluon--heavy-quark (gQ) initiated subprocess, making \gamma + Q production aprocess very sensitive to both the gluon and the heavy-quark partondistribution functions (PDFs). Additionally, the RHIC and LHC experiments areprobing complementary kinematic regions in the momentum fraction x_2 carried bythe target partons. Thus, the nuclear production ratio R^{\gamma+Q}_{pA} canprovide strong constraints, over a broad x-range, on the poorly determinednuclear parton distribution functions which are extremely important for theinterpretation of results in heavy-ion collisions.

Probing gluon and heavy-quark nuclear PDFs with photon + heavy quark production in pA collisions