  Measurements of parity-violating longitudinal analyzing powers Az (normalized
asymmetries) in polarized proton-proton scattering and in polarized neutron
capture on the proton (n+p -> d+gamma) provide a unique window on the interplay
between the weak and strong interactions between and within hadrons. Several
new proton-proton parity violation experiments are presently either being
performed or are being prepared for execution in the near future: at TRIUMF at
221 MeV and 450 MeV and at COSY (Forschungszentrum Juelich) in the multi-GeV
range. A new measurement of the parity-violating gamma ray asymmetry with a
ten-fold improvement in the accuracy over previous measurements is being
developed at LANSCE. These experiments are intended to provide stringent
constraints on the set of six effective weak meson-nucleon coupling constants,
which characterize the weak interaction between hadrons in the energy domain
where meson exchange models provide an appropriate description. The 221 MeV pp
experiment is unique in that it selects a single transition amplitude, 3P2 -
1D2, and consequently constrains the weak meson-nucleon coupling constant
h_rho^(pp). The n+p -> d+gamma experiment is mainly sensitive to the weak
pion-nucleon coupling constant f_pi. Together with the existing pp parity
violation experimental results one may be able to delineate the various weak
meson-nucleon coupling constants. The anomalous result obtained at 6 GeV/c on a
water target requires that a new multi-GeV pp parity violation experiment be
performed.
