Induced Pseudoscalar Coupling Constant

Details Induced Pseudoscalar Coupling Constant Induced Pseudoscalar Coupling Constant

1998-11-03

arxiv.org/abs/nucl-th/9811009v2

Physics

Nuclear Physics

Nuclear Theory

11 pages, 2 figures

Scientific paper

The recent TRIUMF experiment for $\mu^- p \to n \nu_{\mu} \gamma$ gave a surprising result that the induced pseudoscalar coupling constant $g_P$ was larger than the value obtained from $\mu^- p \to n \nu_{\mu}$ experiment as much as 44 %. Reexamining contribution of the axial vector current, we found an additional term to the matrix element of Beder and Fearing which was used to extract the $g_P$ value from the measured photon energy spectrum. This additional term plays a key role to restore the reliability of $g_P (- 0.88 m_{\mu}^2) = 6.77 g_A (0)$.

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