منابع مشابه
Pomeron exchange and exclusive electroproduction of ρ-mesons in QCD
A Pomeron-exchange model of exclusive electroproduction of ρ-mesons is examined using a dressed-quark propagator. It is shown that by representing the photonρ-meson-Pomeron coupling by a nonperturbative, confined-quark loop, one obtains predictions for ρ-meson electroproduction that are in good agreement with experiment.
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 کاملFactorization for hard exclusive electroproduction of mesons in QCD
We formulate and prove a QCD factorization theorem for hard exclusive electroproduction of mesons in QCD. The proof is valid for the leading power in Q and all logarithms. This generalizes previous work on vector meson production in the diffractive region of small x. The amplitude is expressed in terms of off-diagonal generalizations of the usual parton densities. The full theorem applies to al...
متن کاملDeeply virtual and exclusive electroproduction of ω mesons
The exclusive ω electroproduction off the proton was studied in a large kinematical domain above the nucleon resonance region and for the highest possible photon virtuality (Q) with the 5.75 GeV beam at CEBAF and the CLAS spectrometer. Cross sections were measured up to large values of the four-momentum transfer (−t < 2.7 GeV) to the proton. The contributions of the interference terms σTT and σ...
متن کاملA fresh look at exclusive electroproduction of light vector mesons
Relying on the collinear factorization approach, we demonstrate that H1 and ZEUS measurements of exclusive light vector meson and photon electroproduction cross sections can be simultaneously described for photon virtualities ofQ 2GeV. Our findings reveal that quark exchanges are important in this small xBj region and that in leading order approximation the gluonic component is suppressed, e.g....
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ژورنال
عنوان ژورنال: Physics Letters B
سال: 2003
ISSN: 0370-2693
DOI: 10.1016/j.physletb.2003.09.087