Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2010-10-05
Phys.Rev.Lett.106:041803,2011; Phys.Rev.Lett.106:079901,2011
Physics
High Energy Physics
High Energy Physics - Experiment
Accepted for publication in Phys. Rev. Lett
Scientific paper
10.1103/PhysRevLett.106.041803 1
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.
Battu S.
Carey Michael R.
Chitwood D. B.
Crnkovic J.
Debevec P. T.
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