Strong-interaction effects in parity violation in pp scattering.

Abstract

Angular distributions have been calculated for the parity-violating longitudinal analyzing power A/sub z/ from 15 to 800 MeV, based on the parity-violating mixings between phases such as /sup 1/S/sub 0/-/sup 3/P/sub 0/, /sup 3/P/sub 2/-/sup 1/D/sub 2/, etc. At low energies the angular distributions are isotropic (except for the Coulomb region) and only the /sup 1/S/sub 0/-/sup 3/P/sub 0/ phases are important. At energies greater than 100 MeV, the angular distributions show structure due to the importance of higher-J mixings. At 800 MeV the higher-J mixings give contributions to the angular distribution which oscillate around zero and contribute little to the value of the angle-integrated A/sub Z/, even though these contributions may have relatively large maxima at 90/sup 0/ (c.m.). The reversal in the sign of the angle-integrated A/sub Z/ between low energies and 800 MeV comes about naturally from the phase shifts; thus this sign reversal is due solely to the strong-interaction contribution to the parity-violating interaction. Angular-dependence information will be required to separate the various contributions to A/sub Z/ from the possible parity-violating mixings.