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26 April 2024

» arxiv » arxiv.0704.2072

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Measurement of the Rate of Muon Capture in Hydrogen Gas and Determination of the Proton's Pseudoscalar Coupling $g_P$
V.A. Andreev ; T.I. Banks ; T.A. Case ; D.B. Chitwood ; S.M. Clayton ; K.M. Crowe ; J. Deutsch ; J. Egger ; S.J. Freedman ; V.A. Ganzha ; T. Gorringe ; F.E. Gray ; D.W. Hertzog ; M. Hildebrandt ; P. Kammel ; B. Kiburg ; S. Knaack ; P.A. Kravtsov ; A.G. Krivshich ; B. Lauss ; K.L. Lynch ; E.M. Maev ; O.E. Maev ; F. Mulhauser ; C.S. Özben ; C. Petitjean ; G.E. Petrov ; R. Prieels ; G.N. Schapkin ; G.G. Semenchuk ; M.A. Soroka ; V. Tishchenko ; A.A. Vasilyev ; A.A. Vorobyov ; M.E. Vznuzdaev ; P. Winter ;
Date:	16 Apr 2007
Subject:	Nuclear Experiment (nucl-ex)
Abstract:	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.
Source:	arXiv, arxiv.0704.2072
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