1111.1831 (Nikolai Korchagin et al.)

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

Nikolai Korchagin, Nikolai Kochelev, Nikolai Nikolaev

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.

View original: http://arxiv.org/abs/1111.1831