Parity nonconservation in pp scattering has been studied by measuring the helicity dependence of the cross section, Az^ia* -

The transverse polarization of electrons emitted in the beta decay of polarized 8Li nuclei has been measured. For the time-reversal violating triple correlation parameter we find R=(0.9+/-2.2)x10(-3). This result is in agreement with the standard model and yields improved constraints on exotic tensor contributions to the weak interaction. Combined with other experimental results and using a model for the coupling constants, a new limit for the mass of a possible scalar leptoquark, m(LQ)>560 GeV/c(2) (90% C.L.), is obtained.

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Cross-section and vector-analyzing-power data for three star configurations of the 2 H(p ជ ,pp)n breakup reaction at E p lab ϭ65 MeV were measured in a kinematically complete experiment. They are compared to rigorous Faddeev calculations involving five realistic charge-dependent nucleon-nucleon potentials: Argonne v 18 , CD Bonn, Nijmegen 93, Nijmegen I, and Nijmegen II. A general satisfactory agreement between theory and experiment has been found. However, there exist also a few minor discrepancies in cross sections in some regions of phase space. The experimental data are compared also to the calculations including the ͑-͒ Tucson-Melbourne three-body force. Their effects are either negligible or increase the disagreement with the experiment. ͓S0556-2813͑97͒01601-4͔

Parity nonconservation has been studied in elastic pa scattering at 46 MeV with longitudinally polarized protons. The longitudinal analyzing power averaged over the range of laboratory scattering angles of roughly 30° to 60° is found to be A z = ( -3.3 ±0.9) x 10~7. This result and measurements in other light nuclear systems are used to determine weak meson-nucleon coupling constants.