Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-12-06
JHEP 1101:152,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
Scientific paper
10.1007/JHEP01(2011)152
We present a detailed phenomenological study of direct photon production in association with a heavy-quark jet in pA collisions at the Relativistic Heavy Ion Collider (RHIC) and at the Large Hadron Collider (LHC) at next-to-leading order in QCD. The dominant contribution to the cross-section comes from the gluon--heavy-quark (gQ) initiated subprocess, making \gamma + Q production a process very sensitive to both the gluon and the heavy-quark parton distribution functions (PDFs). Additionally, the RHIC and LHC experiments are probing complementary kinematic regions in the momentum fraction x_2 carried by the target partons. Thus, the nuclear production ratio R^{\gamma+Q}_{pA} can provide strong constraints, over a broad x-range, on the poorly determined nuclear parton distribution functions which are extremely important for the interpretation of results in heavy-ion collisions.
Arleo François
Kovarik Karol
Olness Fred
Owens Joseph F.
Schienbein Ingo
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