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We investigated the possibility of determining internal structure of exotichadrons by using high-energy reaction processes, where quarks and gluons areappropriate degrees of freedom. In particular, it should be valuable toinvestigate the high-energy exclusive processes which include generalizedparton distributions (GPDs) and generalized distribution amplitudes (GDAs). TheGPDs and GDAs contain momentum distributions of partons and form factors. Wefound that the exotic nature appears in momentum distributions of quarks assuggested by the constituent-counting rule and in the form factors associatedwith exotic hadron sizes and the number of constituents. Transition GPDs toexotic hadrons could probe such exotic signatures. We also propose that theseexotic signatures should be found in exclusive production processes of exotichadrons from gamma^* gamma in electron-positron annihilation. For example, theGDAs contain information on a time-like form factor of the energy-momentumtensor of a hadron h. We show that the cross section of e gamma -> e+hbar h issensitive to the exotic signature by looking at the hbar h invariant-massdependence by taking light hadrons, h=f_0 (980) and a_0 (980). From such GDAmeasurements, the tomography of exotic hadrons becomes possible, for example,by Belle and BaBar experiments and by future linear collider.

Tomography of exotic hadrons in high-energy exclusive processes