A Precise Determination of the Pion-Nuclear Coupling Parameter from Weak   Processes in ^3He
  We utilize precise weak interaction experiments on atomic muon capture and beta decay in the A = 3 nuclei, and take into account the effects of nuclear "anomalous thresholds" to extract the pseudoscalar pi-^3He-^3H coupling parameter, G^{eff}(m_\pi^2) = 45.8+- 2.4. This is an order of magnitude improvement in precision over that from the use of pion-nuclear scattering data and dispersion relations. 
Nimai C. Mukhopadhyay (1 and 2) and K. Junker (2) ((1) RPI, (2) PSI)