Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2007-04-16
Phys.Rev.Lett.99:032002,2007
Physics
Nuclear Physics
Nuclear Experiment
submitted to Phys.Rev.Lett
Scientific paper
10.1103/PhysRevLett.99.032002
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.
Andreev Anatoly V.
Banks T. I.
Case T. A.
Chitwood D. B.
Clayton Steven M.
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