Phenomenological Connection Between Hadronic Wavefunction and Its Radius

A picture for the hadronic structure is discussed based on previous work^[1]. The radius contributed from the valence Fock-state wavefunction (i.e., qq component) is calculated in ~ the light-cone framework. We propose a concept of the characteristic length λ to represent the contributions of higher Fock states to hadronic radii phenomenologically and calculate its value. Using an equivalence between the "intrinsic" radii of constituent quarks and the radii coming from higher Fock states we put forward a constraint on the hadronic wavefunctions of mesons. It is found that these wavefunctions lead to consistency between theories and experiments for D and B exclusive decays. We also give the radii for K, D and B mesons. The results show that the radius of K meson is in good agreement with experimental data.