Abstract
Nuclear shadowing effects are checked in the production of direct photons and neutral pions in heavy-ion collisions at RHIC/LHC energy within a next-to-leading order perturbative QCD parton model. The transverse momentum dependence of the nuclear modification factors is presented in p + A and A + A collisions to distinguish different parameterizations for nuclear shadowing effects. Our numerical results show that in central A + A collisions the nuclear modification factor for direct photons is more sensitive to shadowing effects than the factor for pion hadrons, and it is a powerful observable to discriminate different parameterizations for parton distributions.
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