منابع مشابه
Coherence Effects in Diffractive Electroproduction of ρ Mesons from Nuclei
A systematic multiple scattering formalism for vector meson electroproduction from nuclei is developed, with emphasis on the formation, propagation and hadronization scales for quark-gluon fluctuations of the virtual high-energy photon. The theory is compared to HERMES measurements of ρ electroproduction on 14 N. The nuclear transparency as a function of the vector meson propagation length is w...
متن کاملDiffractive electroproduction of ρ meson excitations
We use perturbative QCD and parton-hadron duality to estimate the cross sections for the diffractive electroproduction of ρ ′ (1 −) and ρ(3 −) resonances which occur in the 1.3– 1.8 GeV mass interval. We present the cross sections and the ratios σ L /σ T as a function of Q 2. We compare the predictions with those for the diffractive electroproduction of ρ mesons. We show how such diffractive el...
متن کاملPomeron 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 کاملThe QCD description of diffractive ρ meson electroproduction
We critically review the QCD predictions for the cross sections σL and σT for diffractive ρmeson electroproduction in longitudinally and transversely polarised states in the HERA energy region. We show that both perturbative and non-perturbative approaches which involve convolution with the ρ meson wave function predict values of σT which fall-off too quickly with increasing Q2, in comparison w...
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...
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ژورنال
عنوان ژورنال: International Letters of Chemistry, Physics and Astronomy
سال: 2013
ISSN: 2299-3843
DOI: 10.18052/www.scipress.com/ilcpa.24.50