Abstract
It is shown that existence of a large anomalous chromomagnetic moment of quark induced by nonperturbative structure of QCD leads to the additional contribution to exclusive ρ-meson electroproduction off proton target. The 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 nonperturbative 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.
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Korchagin, N., Kochelev, N. & Nikolaev, N. Anomalous quark-gluon chromomagnetic interaction and high-energy ρ-meson electroproduction. Phys. Part. Nuclei Lett. 10, 1–6 (2013). https://doi.org/10.1134/S1547477113010111
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DOI: https://doi.org/10.1134/S1547477113010111