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20 April 2024

» arxiv » 1010.0991

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Measurement of the Positive Muon Lifetime and Determination of the Fermi Constant to Part-per-Million Precision
D.M. Webber ; V. Tishchenko ; Q.~Peng ; S. Battu ; R.M. Carey ; D.B. Chitwood ; J. Crnkovic ; P.T. Debevec ; S. Dhamija ; W. Earle ; A. Gafarov ; K. Giovanetti ; T.P. Gorringe ; F.E. Gray ; Z. Hartwig ; D.W. Hertzog ; B. Johnson ; P. Kammel ; B. Kiburg ; S. Kizilgul ; J. Kunkle ; B. Lauss ; I. Logashenko ; K.R. Lynch ; R. McNabb ; J.P. Miller ; F. Mulhauser ; C.J.G. Onderwater ; J. Phillips ; S. Rath ; B.L. Roberts ; P. Winter ; B. Wolfe ;
Date:	5 Oct 2010
Abstract:	We report a measurement of the positive muon lifetime to a precision of 1.0~parts per million (ppm); it is the most precise particle lifetime ever measured. The experiment used a time-structured, low-energy muon beam and a segmented plastic scintillator array to record more than 2 x 10^{12} decays. Two different stopping target configurations were employed in independent data-taking periods. The combined results give tau_{mu^+}(MuLan) = 2196980.3(2.2)~ps, more than 15 times as precise as any previous experiment. The muon lifetime gives the most precise value for the Fermi constant: G_F(MuLan) = 1.1663788 (7) x 10^-5 GeV^-2 (0.6~ppm). It is also used to extract the mu^-p singlet capture rate, which determines the proton’s weak induced pseudoscalar coupling g_P.
Source:	arXiv, 1010.0991
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