Electroproduction of vector mesons - factorization of end-point contributions
arXiv:hep-ph/0301182 · doi:10.1140/epjc/s2003-01238-9
Abstract
The end-point contributions in the quark longitudinal momentum fraction of the virtual photon ($γ^*$) to vector meson ($V$) impact factor to the diffractive electroproduction amplitude can be factorized in terms of a generalized parton evolution of the target parton distribution. The result is used to model the helicity amplitudes $γ^* p \to V p$ in terms of small $x$ generalized parton distributions.
24 pages LaTex, 4 eps-figures