Finite volume relations for two hadron matrix elements and form factors

Recently, a framework has been developed to study form factors of two hadron states probed by an external current. The method is based on relating two hadron finite-volume matrix elements, computed using lattice QCD, to the corresponding infinite-volume generalized form-factors. We review the formalism, as well as the analytic properties of the generalized form-factors. As a consistency check, we study the formalism in two limits: The limit where the interaction between the two hadrons is perturbative, and the limit where the system forms a bound state. These checks allow us to verify that the formalism yields the expected finite volume scaling relations.