A phenomenological study of helicity amplitudes of high energy exclusive leptoproduction of the rho meson

TL;DR

This paper uses a phenomenological approach to calculate helicity amplitudes in high-energy exclusive rho meson leptoproduction, incorporating twist-3 distribution amplitudes within the kT factorization framework, and compares results with experimental data.

Contribution

It introduces a consistent scheme to include twist-3 distribution amplitudes for transversely polarized rho mesons in helicity amplitude calculations.

Findings

Good agreement with experimental data for helicity amplitude ratios

Validates the use of twist-3 distribution amplitudes in the model

Demonstrates the effectiveness of the kT factorization approach

Abstract

We apply a previously developed scheme to consistently include the twist-3 distribution amplitudes for transversely polarized rho meson in order to evaluate, in the framework of kT factorization, the helicity amplitudes for exclusive leptoproduction of a light vector meson, at leading order in alphaS. We compare our results with high energy experimental data for the ratios of helicity amplitudes T11/T00 and T01/T00 and get a good description of the data.