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Measurement of the Fermi Constant by FAST

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arxiv 0707.3904 v2 pith:5XDBKAZ5 submitted 2007-07-26 hep-ex

Measurement of the Fermi Constant by FAST

A. Barczyk , J. Kirkby , L. Malgeri (CERN) , J. Berdugo , J. Casaus , C. Mana , J. Marin , G. Martinez
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E. Sanchez C. Willmott (CIEMAT) C. Casella M. Pohl (University of Geneva) K. Deiters P. Dick C. Petitjean (PSI) (for the FAST Collaboration)
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keywords constantfastfermilifetimemeasurementmuonbeendetector
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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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