Parity nonconserving two-pion exchange in elastic pp scattering is investigated in the presence of phenomenological strong distortions in various models. Parity violation is included in N N π vertex considering N N and N ∆(1232) intermediate states in box and crossed box diagrams. Using the derived parity nonconserving two-pion exchange potential we calculate the longitudinal analyzing powerĀ L in elastic pp scattering. The predicted effect is of the same order as vector meson exchanges.

Three pion dominated observables of the parity nonconserving interactions between the cold neutrons and parahydrogen are calculated. The transversely polarized neutron spin rotation, unpolarized neutron longitudinal polarization, and photon-asymmetry of the radiative polarized neutron capture are considered. For the numerical evaluation of the observables, the strong interactions are taken into account by the Reid93 potential and the parity nonconserving interactions by the DDH model along with the two-pion exchange. * tero.partanen@helsinki.fi

We calculate the asymmetries in parity nonconserving deuteron photodisintegration due to circularly polarized photons γd → np with the photon laboratory energy ranging from the threshold up to 10 MeV and the radiative capture of thermal polarized neutrons by protons np → γd. We use the leading order electromagnetic Hamiltonian neglecting the smaller nuclear exchange currents. Comparative calculations are done by using the Reid93 and Argonne v18 potentials for the strong interaction and the DDH and FCDH "best" values for the weak couplings in a weak one-meson exchange potential. A weak N ∆ transition potential is used to incorporate also the ∆(1232)-isobar excitation in the coupled-channels formalism. * Electronic address: tero.partanen@helsinki.fi † Electronic address: jouni.niskanen@helsinki.fi where the superscript "(−)" on the wavefunctions refers to the incoming wave boundary conditions. The |T 0 are the relevant isospin states for the pn-interaction, Y LS JM (r) the eigenfunctions of the coupled total angular momentum, and U J(−) κκ ′ (k, r) the complex-valued radial wavefunctions. The quantum numbers LST (relative orbital angular momentum L, total spin S, and total isospin T ), which may be changed by the nuclear forces, are denoted for brevity by κ which

The parity nonconserving longitudinal analyzing powerĀ L is calculated in elastic pp scattering at the energies below the approximate inelastic region T lab = 350 MeV. The short-ranged heavy meson ρ and ω exchanges as well as the longer-ranged 2π exchanges are considered as the mediators of the parity nonconserving interactions. The DDH "best" coupling values are used as the parity nonconserving meson-N N couplings. Also three different parity nonconserving two-pion exchange potentials by various authors are compared.