Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2006-09-06
Phys.Rev.D76:074015,2007
Physics
High Energy Physics
High Energy Physics - Phenomenology
25 pages, 16 postscript figures
Scientific paper
10.1103/PhysRevD.76.074015
We study the Drell-Yan production cross section and structure functions in proton (deuteron)-nucleus collisions using the Color Glass Condensate formalism. The nucleus is treated in the Color Glass Condensate framework which includes both higher twist effects due to the inclusion of multiple scatterings and leading twist pQCD shadowing due to the small x resummation, while the proton (or deuteron) is treated within the DGLAP improved parton model. In particular, the Drell-Yan structure functions are used in order to investigate the Lam-Tung relation at small x, which is known to be identically zero at leading twist up to Next-to-Leading order, and is thus a good playground for studying higher twist effects. In agreement with this, we find that violations of this relation are more important for low momentum and invariant mass of the Drell-Yan pair, and also in the region of rapidity that corresponds to smaller values of x in the nucleus.
Gelis Francois
Jalilian--Marian Jamal
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