Angular Dependence of the Nuclear Enhancement of Drell-Yan Pairs

Details Angular Dependence of the Nuclear Enhancement of Drell-Yan Pairs Angular Dependence of the Nuclear Enhancement of Drell-Yan Pairs

1999-07-30

arxiv.org/abs/hep-ph/9907567v3

Phys.Rev.Lett.83:4261-4264,1999

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages LaTeX, 5 figures; v2: discussion in the summary extended, some references added; v3: manuscript somewhat shortened, eq

Scientific paper

10.1103/PhysRevLett.83.4261

We calculate the nuclear enhancement in the angular distribution of Drell-Yan pairs produced in proton-nucleus reactions. Nuclear effects are encoded in universal twist-4 parton correlation functions. We find that the Lam-Tung relation for the angular coefficients of the lepton-pair distribution holds for the double-hard, but not for the soft-hard contribution. We also predict that nuclear enhancement effects at RHIC energies can be large.

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