Hadron tomography studies by generalized parton distributions and distribution amplitudes

Abstract

We discuss hadron-tomography studies for the nucleon and exotic hadrons by high-energy hadron reactions. First, the constituent-counting rule is explained for determining internal quark configurations of exotic-hadron candidates by scaling properties of high-energy exclusive cross sections. Next, possibilities are discussed for investigating the generalized parton distributions (GPDs) of the nucleon and exotic hadrons at J-PARC. In particular, we study hadronic 2 → 3 process p + p → N + π + B, exclusive Drell-Yan process, and exotic-hadron GPDs. For determining three-dimensional structure of unstable exotic hadrons, we consider s-t crossed quantities of the GPDs called generalized distribution amplitudes (GDAs), which can be investigated at KEKB.We explain possible studies of the GDAs by two-photon processes.