  We investigated the possibility of determining internal structure of exotic
hadrons by using high-energy reaction processes, where quarks and gluons are
appropriate degrees of freedom. In particular, it should be valuable to
investigate the high-energy exclusive processes which include generalized
parton distributions (GPDs) and generalized distribution amplitudes (GDAs). The
GPDs and GDAs contain momentum distributions of partons and form factors. We
found that the exotic nature appears in momentum distributions of quarks as
suggested by the constituent-counting rule and in the form factors associated
with exotic hadron sizes and the number of constituents. Transition GPDs to
exotic hadrons could probe such exotic signatures. We also propose that these
exotic signatures should be found in exclusive production processes of exotic
hadrons from gamma^* gamma in electron-positron annihilation. For example, the
GDAs contain information on a time-like form factor of the energy-momentum
tensor of a hadron h. We show that the cross section of e gamma -> e+hbar h is
sensitive to the exotic signature by looking at the hbar h invariant-mass
dependence by taking light hadrons, h=f_0 (980) and a_0 (980). From such GDA
measurements, the tomography of exotic hadrons becomes possible, for example,
by Belle and BaBar experiments and by future linear collider.
