Generalized parton distributions from charged current meson production

Marat Siddikov,Iván Schmidt

doi:10.1103/physrevd.99.116005

Abstract

In this paper we prove that the simultaneous study of both $\rho$- and $\pi$-meson production by charged currents in Bjorken kinematics allows for a very clean extraction of the leading twist Generalized Parton Distributions of the target, with inherent control of the contribution of higher-twist corrections. Also, it might provide target-independent constraints on the distribution amplitudes of the produced mesons. We expect that such processes might be studied either in neutrino-induced or in electron-induced processes. According to our numerical estimates, the cross-sections of these processes are within the reach of JLab and EIC experiments.

Highlights

The structure of the hadrons remains up to now a challenging puzzle, which attracts a lot of attention from both theoretical and experimental viewpoints. This structure is parametrized in terms of the so-called generalized parton distributions (GPDs), which are directly related to amplitudes of physical processes in Bjorken kinematics [1,2]
The early analyses of GPDs were mostly based on experimental data on deeply virtual Compton scattering (DVCS) [3] and deeply virtual meson production (DVMP) [4,5,6,7,8,9,10,11,12,13,14,15,16,17], yet very soon it was realized that in view of the rich structure of GPDs, the poorly known wave functions of the produced mesons, as well as the sizable higher twist contributions [17,18,19,20,21], additional channels are needed
In this paper we studied the contributions for ρ-meson production in Bjorken kinematics

Summary

Introduction

The structure of the hadrons remains up to now a challenging puzzle, which attracts a lot of attention from both theoretical and experimental viewpoints. Nowadays, this structure is parametrized in terms of the so-called generalized parton distributions (GPDs), which are directly related to amplitudes of physical processes in Bjorken kinematics [1,2]. Since the amplitudes of physical processes typically include contributions of GPDs of several flavors and helicity states (sometimes convoluted with distribution amplitudes of other hadrons), the GPDs could be extracted only from self-consistent global fits of all available experimental data.

Objectives

Results

Conclusion