Mesonic and Binding Contributions to the Nuclear Drell-Yan Process
arXiv:nucl-th/9712005 · doi:10.1016/S0375-9474(98)00607-1
Abstract
We have evaluated the Drell-Yan cross section in nuclei paying special attention to the meson cloud contribution from pion and rho-meson, for which an accurate calculation using the meson nuclear spectral functions is used. Similarly, the nucleonic contribution is evaluated in terms of a relativistic nucleon spectral function. Fair agreement with experiment is found for different nuclei and the results show a sizeable contribution from the renormalized meson cloud. In order to reproduce the experiment a novel element is introduced, consisting of a gradual energy loss of the incoming proton in its pass through the nucleus which produces a strong A dependence at x_1 large.
11 pages, LaTeX, 4 PostScript figures, submitted to Physics Letters B