Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-06-15
Phys.Rev. D66 (2002) 114011
Physics
High Energy Physics
High Energy Physics - Phenomenology
22 pages, latex, feynmf
Scientific paper
10.1103/PhysRevD.66.114011
Within a perturbative scalar QED model recently considered by Brodsky et al., we study how leading-twist Coulomb rescatterings affect the Drell-Yan cross section at small x = x_{target}, and compare to the case of deep inelastic scattering at small x_{B}. We show that in the range where the transverse momentum transferred to the target is large compared to its minimal value $\sim \morder{x}$, Coulomb rescatterings affect the DIS cross section but not the Drell-Yan production rate. This illustrates that the leading-twist parton distribution functions become non-universal when cross sections which are differential in target-related particles are considered.
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