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

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dc.creatorAndreev, V. A.
dc.creatorBanks, T. I.
dc.creatorCase, T. A.
dc.creatorChitwood, D. B.
dc.creatorClayton, S. M.
dc.creatorCrowe, K. M.
dc.creatorDeutsch, J.
dc.creatorEgger, J.
dc.creatorFreedman, S. J.
dc.creatorGanzha, V. A.
dc.creatorGorringe, T.
dc.creatorGray, F. E.
dc.creatorHertzog, D. W.
dc.creatorHildebrandt, M.
dc.creatorKammel, P.
dc.creatorKiburg, B.
dc.creatorKnaack, S.
dc.creatorKravtsov, P. A.
dc.creatorKrivshich, A. G.
dc.creatorLauss, B.
dc.creatorLynch, K. L.
dc.creatorMaev, E. M.
dc.creatorMaev, O. E.
dc.creatorMulhauser, F.
dc.creatorÖzben, C. S.
dc.creatorPetitjean, C.
dc.creatorPetrov, G. E.
dc.creatorPrieels, R.
dc.creatorSchapkin, G. N.
dc.creatorSemenchuk, G. G.
dc.creatorSoroka, M. A.
dc.creatorTishchenko, V.
dc.creatorVasilyev, A. A.
dc.creatorVorobyov, A. A.
dc.creatorVznuzdaev, M. E.
dc.creatorWinter, P.
dc.date2007-04-16
dc.date.accessioned2026-07-07T10:59:36Z
dc.date.available2026-07-07T10:59:36Z
dc.descriptionThe 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 $μ^-$ disappearance rate in hydrogen and the world average for the $μ^+$ 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 $μp$ atom is measured to be $Λ_S=725.0 \pm 17.4 s^{-1}$, from which the induced pseudoscalar coupling of the nucleon, $g_P(q^2=-0.88 m_μ^2)=7.3 \pm 1.1$, is extracted. This result is consistent with theoretical predictions for $g_P$ that are based on the approximate chiral symmetry of QCD.
dc.descriptionsubmitted to Phys.Rev.Lett
dc.identifierhttps://arxiv.org/abs/0704.2072
dc.identifierhttp://arxiv.org/abs/0704.2072
dc.identifierPhys.Rev.Lett.99:032002,2007
dc.identifierdoi:10.1103/PhysRevLett.99.032002
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/187457
dc.subjectNuclear Experiment
dc.titleMeasurement of the Rate of Muon Capture in Hydrogen Gas and Determination of the Proton's Pseudoscalar Coupling $g_P$
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