A Precise Determination of the Pion-Nuclear Coupling Parameter from Weak Processes in ^3He

Details A Precise Determination of the Pion-Nuclear Coupling Parameter from Weak Processes in ^3He A Precise Determination of the Pion-Nuclear Coupling Parameter from Weak Processes in ^3He

1996-12-13

arxiv.org/abs/nucl-th/9612035v1

Phys.Rev.Lett. 77 (1996) 5342-5345

Physics

Nuclear Physics

Nuclear Theory

to be published in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.77.5342

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.

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