Parity-Violating Effects in Two-Nucleon Systems
We report recent results obtained for the parity-violating (PV) asymmetries in pp elastic scattering, np radiative capture at thermal neutron energies, and deuteron electro-disintegration in quasi-elastic kinematics. The available data on the pp longitudinal asymmetry are used to put constraints on some of the P V vector-meson couplings occurring in the DDH model for the PV nucleon-nucleon interaction. In the np capture, we show that a measurement of the associated asymmetry will lead to an essentially model-independent determination of the PV pion coupling to the nucleon. Finally, in quasi-elastic electron scattering as demonstrate that the asymmetry induced by hadronic weak interactions (and associated currents) is two orders of magnitude smaller than that originating from interference of the 7- and Z-exchange amplitudes.
- Research Organization:
- Thomas Jefferson National Accelerator Facility, Newport News, VA (US)
- Sponsoring Organization:
- USDOE Office of Energy Research (ER) (US)
- DOE Contract Number:
- AC05-84ER40150
- OSTI ID:
- 809870
- Report Number(s):
- JLAB-THY-02-65; DOE/ER/40150-2415
- Country of Publication:
- United States
- Language:
- English
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