Measurement of the Fermi Constant by FAST

Details Measurement of the Fermi Constant by FAST Measurement of the Fermi Constant by FAST

2007-07-26

arxiv.org/abs/0707.3904v2

Phys.Lett.B663:172-180,2008

Physics

High Energy Physics

High Energy Physics - Experiment

15 pages, 6 figures

Scientific paper

10.1016/j.physletb.2008.04.006

An initial measurement of the lifetime of the positive muon to a precision of 16 parts per million (ppm) has been performed with the FAST detector at the Paul Scherrer Institute. The result is tau_mu = 2.197083 (32) (15) microsec, where the first error is statistical and the second is systematic. The muon lifetime determines the Fermi constant, G_F = 1.166353 (9) x 10^-5 GeV^-2 (8 ppm).

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