Rapidity dependence of the photon to pion production ratio in high energy collisions

We investigate rapidity dependence of the ratio of photon and pion production cross sections in high energy proton (deuteron)–nucleus collisions at RHIC and LHC. This ratio, and its rapidity dependence can be a sensitive probe of high density QCD (Color Glass Condensate) dynamics and shed further light on the role of saturation physics at RHIC and LHC.