Abstract
The Holdeman-Thaler modified optical theorem is used to compute Coulomb contributions to the parity-violating helicity dependence of proton total cross sections. For 15-MeV protons incident on hydrogen, the result is a modest (perhaps 20%) reduction in the experimental signal, while for 6-GeV protons on water, there is a comparable (15%) enhancement. The large experimental signal reported at 6 GeV is shown to imply an order-of-magnitude enhancement by strong interactions of the weak forward scattering amplitude. A phase convention is proposed to facilitate application of the modified optical theorem to the general problem of measuring total cross sections in the presence of Coulomb forces.
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