Anomalous quark-gluon chromomagnetic interaction and high energy $\rho$-meson electroproduction

Abstract

It is shown that existence of a large anomalous chromomagnetic moment of quark induced by non-perturbative structure of QCD leads to the additional contribution to exclusive $\rho$-meson electroproduction off proton target. The significant contribution coming from new type of quark-gluon interaction to the $\rho$-meson production cross section for both transversal and longitudinal polarization of virtual photon is found. Such non-perturbative contribution together with conventional perturbative two-gluon exchange allows us to describe the experimental data at low $Q^2$ for transversal polarization. However, in the longitudinal polarization case there is still some discrepancy with the data. The possible source of this deviation is discussed.

Latex, 10 pages, 4 figures, references added and typos fixed

References in corpus (4)

• A phenomenological study of helicity amplitudes of high energy exclusive leptoproduction of the rho meson
• Spin Density Matrix Elements in Exclusive rho^0 Electroproduction on 1H and 2H Targets at 27.5 GeV Beam Energy
• Selected highlights from the study of mesons
• Diffractive production of vector mesons in Deep Inelastic Scattering within k_t-factorization approach

Cited by in corpus (1)

• Exclusive production of $\rho$ meson in gamma-proton collisions: $d\sigma /dt$ and the role of helicity flip processes