QCD description of diffractiveρmeson electroproduction
نویسندگان
چکیده
منابع مشابه
The 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...
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 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 کاملHard Exclusive Electroproduction of Pseudoscalar Mesons and QCD Axial Anomaly
Hard exclusive electroproduction of π0, η, η mesons by the longitudinal photons is considered. With the help of the QCD factorization theorem we show that at sufficiently large virtualities Q2 amplitudes of hard exclusive processes may be calculated in terms of the target parton distributions and the minimal Fock component of the pseudoscalar meson light cone wave function at zero interquark di...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physical Review D
سال: 1997
ISSN: 0556-2821,1089-4918
DOI: 10.1103/physrevd.55.4329