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Spacelike and timelike generalized parton distributions (GPDs) have beeninvestigated in charged-lepton scattering and electron-positron collisions viadeeply virtual Compton scattering and two-photon processes, respectively.Furthermore, we expect that hadron-accelerator-facility measurements will beperformed in future. The GPDs will play a crucial role in clarifying theorigins of hadron spins and masses in terms of quarks and gluons. It is alsopossible to probe internal pressure within hadrons for understanding theirstability. Gravitational form factors of hadrons used to be considered as apurely academic subject because gravitational interactions are too weak to bemeasured in microscopic systems. However, due to the development ofhadron-tomography field, it became possible to extract the gravitational formfactors from the actual GPD measurements without relying on directgravitational interactions. Neutrino reactions can also be used for GPD studiesin future, for example, by using the Long-Baseline Neutrino Facility atFermilab. The neutrino GPD measurements are valuable especially for finding theflavor dependence of the GPDs in a complementary way to the charged-leptonexperiments. We give an overview of the GPDs and discuss possible neutrino GPDmeasurements using the single-pion production processes $\nu + N \to \ell^- +N' + \pi$ and $\bar\nu + N \to \ell^+ + N' + \pi$.

Possible studies on generalized parton distributions and gravitational form factors in neutrino reactions