Phenomenological study of helicity amplitudes of high energy exclusive leptoproduction of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>ρ</mml:mi></mml:math>meson

Abstract

We apply a previously developed scheme to consistently include the twist-3 distribution amplitudes for transversely polarized $\ensuremath{\rho}$ mesons in order to evaluate, in the framework of ${k}_{T}$ factorization, the helicity amplitudes for exclusive leptoproduction of a light vector meson, at leading order in ${\ensuremath{\alpha}}_{s}$. We compare our results with high energy experimental data for the ratios of helicity amplitudes ${T}_{11}/{T}_{00}$ and ${T}_{01}/{T}_{00}$ and get a good description of the data.