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

Abstract : 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.
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http://hal.in2p3.fr/in2p3-00544228
Contributor : Emmanuelle Vernay <>
Submitted on : Tuesday, December 7, 2010 - 3:13:15 PM
Last modification on : Thursday, November 19, 2020 - 12:58:50 PM

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T. Stavreva, I. Schienbein, F. Arleo, K. Kovarik, F. Olness, et al.. Probing gluon and heavy-quark nuclear PDFs with photon + heavy quark production in pA collisions. Journal of High Energy Physics, Springer, 2011, 01, pp.152. ⟨10.1007/JHEP01(2011)152⟩. ⟨in2p3-00544228⟩

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