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The rate of nuclear muon capture by the proton has been measured using a newexperimental technique based on a time projection chamber operating inultra-clean, deuterium-depleted hydrogen gas at 1 MPa pressure. The capturerate was obtained from the difference between the measured $\mu^-$disappearance rate in hydrogen and the world average for the $\mu^+$ decayrate. The target's low gas density of 1% compared to liquid hydrogen is key toavoiding uncertainties that arise from the formation of muonic molecules. Thecapture rate from the hyperfine singlet ground state of the $\mu p$ atom ismeasured to be $\Lambda_S=725.0 \pm 17.4 s^{-1}$, from which the inducedpseudoscalar coupling of the nucleon, $g_P(q^2=-0.88 m_\mu^2)=7.3 \pm 1.1$, isextracted. This result is consistent with theoretical predictions for $g_P$that are based on the approximate chiral symmetry of QCD.

Measurement of the Rate of Muon Capture in Hydrogen Gas and Determination of the Proton's Pseudoscalar Coupling $g_P$