Accessing proton generalized parton distributions and pion distribution amplitudes with the exclusive pion-induced Drell-Yan process at J-PARC

TL;DR

This paper explores how the exclusive pion-induced Drell-Yan process can be used at J-PARC to access nucleon GPDs and pion distribution amplitudes, providing a new experimental test of QCD in hadron structure studies.

Contribution

It presents recent theoretical developments and assesses the feasibility of measuring the process at J-PARC to probe nucleon GPDs in a novel way.

Findings

Feasibility of measuring the process at J-PARC is analyzed.

The process offers a new way to access nucleon GPDs at large timelike virtuality.

Theoretical descriptions of the process in terms of GPDs and distribution amplitudes are discussed.

Abstract

Generalized parton distributions (GPDs) encoding multidimensional information of hadron partonic structure appear as the building blocks in a factorized description of hard exclusive reactions. The nucleon GPDs have been accessed by deeply virtual Compton scattering and deeply virtual meson production with lepton beam. A complementary probe with hadron beam is the exclusive pion-induced Drell-Yan process. In this paper, we discuss recent theoretical advances on describing this process in terms of nucleon GPDs and pion distribution amplitudes. Furthermore, we address the feasibility of measuring the exclusive pion-induced Drell-Yan process $\pi^- p \to \mu^+\mu^- n$ via a spectrometer at the High Momentum Beamline being constructed at J-PARC in Japan. Realization of such measurement at J-PARC will provide a new test of perturbative QCD descriptions of a novel class of hard exclusive reactions. It will also offer the possibility of experimentally accessing nucleon GPDs at large timelike virtuality.