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

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 $ρ$-meson electroproduction off proton target. The significant contribution coming from new type of quark-gluon interaction to the $ρ$-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.

No reviews yet.

No comments yet.