Nuclear shadowing and prompt photons at relativistic hadron colliders

Details Nuclear shadowing and prompt photons at relativistic hadron colliders Nuclear shadowing and prompt photons at relativistic hadron colliders

2008-07-10

arxiv.org/abs/0807.1680v2

Phys.Rev.C78:037901,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 3 figures. Version to be published in PRC

Scientific paper

10.1103/PhysRevC.78.037901

The production of prompt photons at high energies provides a direct probe of the dynamics of the strong interactions. In particular, one expect that it could be used to constrain the behavior of the nuclear gluon distribution in $pA$ and $AA$ collisions. In this letter we investigate the influence of nuclear effects in the production of prompt photons and estimate the transverse momentum dependence of the nuclear ratios $R_{pA} = {\frac{d\sigma (pA)}{dy d^2 p_T}} / A {\frac{d\sigma (pp)}{dy d^2 p_T}}$ and $R_{AA} = {\frac{d\sigma (AA)}{dy d^2 p_T}} / A^2 {\frac{d\sigma (pp)}{dy d^2 p_T}}$ at RHIC and LHC energies. We demonstrate that the study of these observables can be useful to determine the magnitude of the shadowing and antishadowing effects in the nuclear gluon distribution.

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