  In nuclear physics, it is well known that the electromagnetic (Coulomb)
interaction between final state products can drastically effect particle
reaction rates. Near thresholds, for example, nuclear alpha decay is suppressed
while nuclear beta decay is enhanced by final state Coulomb interactions. Here
we discuss high energy physics enhancement and/or suppression of reactions
wherein the potentials must include weak and strong as well as electromagnetic
interactions. Potentials due to the exchange of gluons and the exchange of a
hypothetical Higgs particle are explicitly considered.
