Radiative Muon Capture on Hydrogen and the Induced Pseudoscalar Coupling

Details Radiative Muon Capture on Hydrogen and the Induced Pseudoscalar Coupling Radiative Muon Capture on Hydrogen and the Induced Pseudoscalar Coupling

1996-08-22

arxiv.org/abs/nucl-ex/9608005v1

Phys.Rev.Lett.77:4512-4515,1996

Physics

Nuclear Physics

Nuclear Experiment

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

Scientific paper

10.1103/PhysRevLett.77.4512

The first measurement of the elementary process $\mu^- p \rightarrow \nu_{\mu} n \gamma$ 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.

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