Contribution of Nucleon Currents to Radiative Muon Capture by a Proton

The observables for the reaction ${\mu }^{-}+p\to n+\nu +\gamma$ are calculated for a general ($\mathrm{pn}\mu \nu$) coupling including all terms of order ($\frac{\mu }{M}$) and leading terms of order ${\left(\frac{\mu }{M}\right)}^2$, where $\mu$ is the meson mass and $M$ the nucleon mass. The nucleon anomalous magnetic moments are handled by the inclusion of a simple Pauli term and all other virtual pion effects are omitted here. The ($\frac{\mu }{M}$) terms change the radiative capture rate by as much as 30%. Parity-nonconserving effects are decreased only slightly.