Abstract
The following theorem is proved in SU(2) and SU(3) groups, that is, the absolute magnitude of the non zero crossing matrix element between s-channel amplitude in the singlet state and t- or u-channel amplitude in a given arbitrary multiplet state is never smaller than the absolute magnitude of the crossing matrix element between s-channel amplitude in an arbitrary multiplet state and t- or u-channel amplitude in a given arbitrary multiplet state. Possible implications of this theorem in the high energy scattering are discussed.