Radiative Muon Capture on Hydrogen and the Induced Pseudoscalar Coupling

Abstract

The first measurement of the elementary process ${\mu }^{-}p\to {\nu }_{\mu }n\gamma$ is reported. A photon pair spectrometer was used to measure the partial branching ratio ($2.10\pm 0.22)\times 10^{-8}$ for photons of k > 60 MeV. The value of the weak pseudoscalar coupling constant determined from the partial branching ratio is $g_p(q^2=-0.88m_{\mu }^2)=(9.8\pm 0.7\pm 0.3)\cdot g_a(0)$, where the first error is the quadrature sum of statistical and systematic uncertainties and the second error is due to the uncertainty in ${\lambda }_{op}$, the decay rate of the ortho to para $p\mu p$ molecule. This value of g_p is $\sim$1.5 times the prediction of PCAC and pion-pole dominance.

13 pages, RevTeX type, 3 figures (encapsulated postscript), submitted to Phys. Rev. Lett

References in corpus (1)

• QCD Accurately Predicts the Induced Pseudoscalar Coupling Constant

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