Measurement of the rate of muon capture in hydrogen gas and determination of the proton's pseudoscalar coupling g(P)
(2007) Physical Review Letters — Vol. 99, p. 32002 (2007)
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- (en) The rate of nuclear muon capture by the proton has been measured using a new experimental technique based on a time projection chamber operating in ultra-clean, deuterium-depleted hydrogen gas at 1 MPa pressure. The capture rate was obtained from the difference between the measured $\mu^-$ disappearance rate in hydrogen and the world average for the $\mu^+$ decay rate. The target's low gas density of 1% compared to liquid hydrogen is key to avoiding uncertainties that arise from the formation of muonic molecules. The capture rate from the hyperfine singlet ground state of the $\mu p$ atom is measured to be $\Lambda_S=725.0 \pm 17.4 s^{-1}$, from which the induced pseudoscalar coupling of the nucleon, $g_P(q^2=-0.88 m_\mu^2)=7.3 \pm 1.1$, is extracted. This result is consistent with theoretical predictions for $g_P$ that are based on the approximate chiral symmetry of QCD. Comment: submitted to Phys.Rev.Lett
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Prieels, R., Andreev, V. A., Deutsch, J., & et al. (2007). Measurement of the rate of muon capture in hydrogen gas and determination of the proton’s pseudoscalar coupling g(P). Physical Review Letters, 99, 32002. https://doi.org/10.1103/PhysRevLett.99.032002 (Original work published 2007)