Improved Measurement of the Positive-Muon Lifetime and Determination of the Fermi Constant
Journal Article
·
· Physical Review Letters
- Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801 (United States)
- Department of Physics, University of California, Berkeley, California 94720 (United States)
- TRIUMF, Vancouver, BC, V6T 2A3 (Canada)
- Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506 (United States)
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, {tau}{sub {mu}}=2.197 013(24) {mu}s, is in excellent agreement with the previous world average. The new world average {tau}{sub {mu}}=2.197 019(21) {mu}s determines the Fermi constant G{sub F}=1.166 371(6)x10{sup -5} GeV{sup -2} (5 ppm). Additionally, the precision measurement of the positive-muon lifetime is needed to determine the nucleon pseudoscalar coupling g{sub P}.
- OSTI ID:
- 20957895
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 3 Vol. 99; ISSN 0031-9007; ISSN PRLTAO
- Country of Publication:
- United States
- Language:
- English
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