UNIVERSALITY IN THE ELECTROPRODUCTION OF VECTOR MESONS

Electroproduction of Vector Mesons

Exclusive electroproduction of vector mesons (VMs) is a particularly good process for studying the transition from the soft to the hard regime of strong interactions [1], the former being well described within the Regge phenomenology while the latter by perturbative QCD (pQCD). The interest in this interplay comes from the need to understand at which scale a partonic language is applicable. The...

Hard Electroproduction of Vector Mesons

In this talk I am going to report on an ongoing analysis [1, 2, 3] of hard electroproduction of light vector mesons within the handbag approach which is based on QCD factorization into hard subprocesses and generalized parton distributions (GPDs) encoding the soft, nonperturbative physics. As is well-known the leading-twist contribution (i.e. employing the collinear approximation) evaluated to ...

Deeply Virtual Electroproduction of Vector Mesons

Electroproduction of longitudinally polarized vector mesons

It is reported on an analysis of electroproduction of light vector mesons at small Bjorken-x (xBj) within the handbag approach. The partonic subprocesses, meson electroproduction off quarks or gluons, are calculated within the modified perturbative approach (m.p.a.) in which quark transverse momenta are retained. The soft hadronic matrix elements, generalized parton distributions (GPDs), are co...

Transversity GPD in photo- and electroproduction of two vector mesons

The chiral-odd generalized parton distribution (GPD), or transversity GPD, of the nucleon can be accessed experimentally through the photoor electroproduction of two vector mesons on a polarized nucleon target, γN → ρ1ρ2N , where ρ1 is produced at large transverse momentum, ρ2 is transversely polarized, and the mesons are separated by a large rapidity gap. We predict the cross section for this ...