SIGNATURE OF REGGE CUTS COUPLED TO SPINNING PARTICLES

It is proved, by perturbation theory and by the method of Sudakov, that if two Regge poles with trajectories α1, α2 and signatures τ1, τ2 are exchanged, the resulting Regge branch point at j=α1+α2-1 appears only in partial-wave amplitudes of signature τ1τ2η, where η=-1 if both Regge poles are fermions and η=+1 otherwise. An example is given from the case of proton-proton scattering. © 1969 The American Physical Society.