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Measurement of the Positive Muon Lifetime and Determination of the Fermi Constant to Part-per-Million Precision

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arxiv 1010.0991 v2 pith:ZRFKVQO2 submitted 2010-10-05 hep-ex nucl-ex

D.M. Webber , V. Tishchenko , Q.~Peng , S. Battu , R.M. Carey , D.B. Chitwood , J. Crnkovic , P.T. Debevec
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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
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classification hep-exnucl-ex
keywords lifetimemuonpreciseconstantexperimentfermimeasurementmulan
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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.

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Cited by 4 Pith papers

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  1. Three-loop corrections to the Fermi decay constant in the $\overline{\rm{MS}}$ scheme

    hep-ph 2025-07 conditional novelty 7.0 of 10

    The leading three-loop corrections to the Fermi decay constant in the pure MS scheme are computed, shifting the Standard Model Higgs VEV down by about 3.5 MeV and cutting residual scale dependence to below 2e-6.

  2. On the extraction of $\alpha_\textit{em}(m_Z^2)$ at Tera-$Z$

    hep-ph 2025-01 conditional novelty 7.0 of 10

    Forward-region Bhabha ratios at Tera-Z could extract alpha_em(m_Z^2) with a projected statistical sensitivity of about 6e-6, below the current bottleneck.

  3. Neutrino Induced Charged Current Coherent Pion Production for Constraining the Muon Neutrino Flux at DUNE

    hep-ph 2025-02 conditional novelty 6.0 of 10

    Monte Carlo projections indicate that neutrino-induced coherent pion production can constrain the DUNE muon-neutrino flux normalization to about 1.5% (in-situ pion-argon measurement) or 2-5% (external pion-argon data)...

  4. Complete $\mathcal{O}(\alpha_s^2)$ Corrections to the Leptonic Invariant Mass Spectrum in $b\to X_c l\bar{\nu}_l$ Decay

    hep-ph 2024-11 accept novelty 6.0 of 10

    The authors complete the O(alpha_s^2) perturbative correction to the q^2 spectrum of b -> X_c l nu_l, adding the triple-charm channel, and confirm the existing single-charm result.

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