Phenomenology of Distribution Amplitudes for the rho meson

TL;DR

This paper extracts the twist-2 and twist-3 distribution amplitudes of the rho meson from HERA data using dipole models, confirming consistency with theoretical predictions like Sum Rules and lattice calculations.

Contribution

It provides the first extraction of rho meson distribution amplitudes from experimental data using CGC and Regge inspired models, aligning with theoretical expectations.

Findings

Extracted rho meson DAs consistent with Sum Rules

Results agree with lattice predictions

Demonstrated effectiveness of dipole models in DA extraction

Abstract

We report on a successful extraction of the twist-2 and twist-3 Distribution Amplitudes (DAs) of the rho meson using the HERA data on diffractive rho photoproduction. We extract these DAs using several Colour Glass Condensate (CGC) inspired and a Regge inspired dipole models. All our extracted DAs are consistent with Sum Rules and lattice predictions.