  The parity nonconserving longitudinal analyzing power A_L is calculated in
elastic pp scattering at the energies below the approximate inelastic region
T_lab = 350 MeV. The short-ranged heavy meson rho and omega exchanges as well
as the longer-ranged two pion exchanges are considered as the mediators of the
parity nonconserving interactions. The DDH "best" coupling values are used as
the parity nonconserving meson-NN couplings. Also three different parity
nonconserving two-pion exchange potentials by various authors are compared.
