منابع مشابه
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 ...
متن کاملExclusive Photo-and Electroproduction of Mesons in the Gev Region
We consider the reactions γ p → M B, with M B being either K + Λ, K + Σ 0 , or π + n, within a diquark model which is based on perturbative QCD. The model parameters and the quark-diquark distribution amplitudes of the baryons are taken from previous investigations of electromagnetic baryon form factors and Compton-scattering off protons. Reasonable agreement with the few existing photoproduc-t...
متن کاملElectroproduction 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...
متن کاملNonperturbative and Perturbative Aspects of Photo- and Electroproduction of Vector Mesons
We discuss various aspects of vector meson production, first analysing the interplay between perturbative and nonperturbative aspects of the QCD calculation. Using a general method adapted to incorporate both perturbative and nonpertubative aspects, we show that nonperturbative effects are important for all experimentally available values of the photon virtuality Q. We compare the huge amount o...
متن کاملHard 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 ...
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ژورنال
عنوان ژورنال: Zeitschrift f�r Physik A Hadrons and Nuclei
سال: 1995
ISSN: 0939-7922,1434-601X
DOI: 10.1007/bf01289506