Phys. Rev. Lett. 99, 032001 (2007) [5 pages]Improved Measurement of the Positive-Muon Lifetime and Determination of the Fermi Constant
The mean life of the positive muon has been measured to a precision of 11 ppm using a low-energy, pulsed muon beam stopped in a ferromagnetic target, which was surrounded by a scintillator detector array. The result, τμ=2.197 013(24) μs, is in excellent agreement with the previous world average. The new world average τμ=2.197 019(21) μs determines the Fermi constant GF=1.166 371(6)×10-5 GeV-2 (5 ppm). Additionally, the precision measurement of the positive-muon lifetime is needed to determine the nucleon pseudoscalar coupling gP. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.99.032001
DOI:
10.1103/PhysRevLett.99.032001
PACS:
14.60.Ef, 13.35.Bv
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