Electroproduction of longitudinally polarized vector mesons
نویسنده
چکیده
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 constructed from the CTEQ6 parton distribution functions (PDFs) by means of double distributions. The cross sections for longitudinal polarized virtual photons evaluated from this approach, are in very good agreement with experiment in a wide range of kinematics.
منابع مشابه
Hard diffractive electroproduction of heavy flavor vector mesons in QCD
We outline QCD predictions for the diffractive electroproduction of heavy flavor vector mesons and compare them with available data. ∗On leave of absence from the St.Petersburg Nuclear Physics Institute, Russia. Supported by BSF Grant No. 9200126 1 Diffractive electroproduction of heavy flavor vector mesons in QCD It has been understood recently that at sufficiently large Q diffractive electrop...
متن کاملHard diffractive electroproduction of vector mesons in QCD.
Hard diffractive electroproduction of longitudinally polarized vector mesons is calculated within the leading αs ln Q2 ΛQCD approximation of QCD using the leading order parton densities within the nucleon. Novel QCD features of the production of excited states and of the restoration of flavor symmetry are analyzed. At the onset of the asymptotic regime, our analysis finds an important role of q...
متن کاملProbing Transversity GPDs in Photo and Electroproduction of Two Vector Mesons
Electroproduction of two mesons well separated in rapidity allows the first feasible selective access to chiral-odd transversity GPDs provided one of these mesons is a transversely polarized vector meson ρT .
متن کاملExplicit Proof That Electroproduction of Transversely Polarized Mesons Vanishes in Perturbative Qcd
By means of an explicit one-loop calculation, it is shown that the leading twist contribution to the exclusive electroproduction of transversely polarized vector mesons from the nucleon vanishes. This confirms the all-orders proof by Collins and Diehl. Typeset using REVTEX Permanent Address: Department of Physics, Quaid-e-Azam University, Islamabad 45320, Pakistan
متن کاملar X iv : h ep - p h / 96 05 45 6 v 1 3 1 M ay 1 99 6 Polarized Lambdas in the Current Fragmentation Region ∗
Data on the nucleon spin structure suggests that the u (and d) quark distributions in the Λ hyperon may be polarized. If this correlation carries over into fragmentation, then the study of polarized Λ's in the current fragmentation region of deep inelastic lepton scattering will be a sensitive probe of nucleon spin structure. Λ production by polarized electrons from unpolarized targets can sear...
متن کامل