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We study the Drell-Yan production cross section and structure functions inproton (deuteron)-nucleus collisions using the Color Glass Condensateformalism. The nucleus is treated in the Color Glass Condensate framework whichincludes both higher twist effects due to the inclusion of multiple scatteringsand leading twist pQCD shadowing due to the small x resummation, while theproton (or deuteron) is treated within the DGLAP improved parton model. Inparticular, the Drell-Yan structure functions are used in order to investigatethe Lam-Tung relation at small x, which is known to be identically zero atleading twist up to Next-to-Leading order, and is thus a good playground forstudying higher twist effects. In agreement with this, we find that violationsof this relation are more important for low momentum and invariant mass of theDrell-Yan pair, and also in the region of rapidity that corresponds to smallervalues of x in the nucleus.Comment: 25 pages, 16 postscript figure

Drell-Yan production and Lam-Tung relation in the color glass condensate formalism