Model for Reggeon-Pomeranchukon cuts

A model is presented for calculating Reggeon-Pomeranchukon cuts, making use explicitly of the Mandelstam diagram. External spins are treated in a natural way. Calculation for the general case is outlined and it is shown that in practical application the cut can be calculated in a standard way. Cuts associated with the exchanges of $\pi$, $\rho$, $B$, and $A_2$ are considered, and characteristics of the $RP$ cuts, as well as the structure functions, are extracted and discussed. It is found that the model differs considerably from the absorption model. Two suppression schemes are operative which control the magnitudes of cut contributions to amplitudes with "naturality" opposite to the Reggeon. The $\pi P$ cut is found to be a unique case because of the smallness of the pion mass. In general, the $RP$ cuts are self-conspiratorial. At very high energies, all cuts, except $\pi P$ cut, exhibit quasifactorization.