Improved Measurement of the Positive Muon Lifetime and Determination of the Fermi Constant

Details Improved Measurement of the Positive Muon Lifetime and Determination of the Fermi Constant Improved Measurement of the Positive Muon Lifetime and Determination of the Fermi Constant

2007-04-16

arxiv.org/abs/0704.1981v2

Phys.Rev.Lett.99:032001,2007

Physics

High Energy Physics

High Energy Physics - Experiment

As published version (PRL, July 2007)

Scientific paper

10.1103/PhysRevLett.99.032001

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_mu = 2.197013(24) us, is in excellent agreement with the previous world average. The new world average tau_mu = 2.197019(21) us determines the Fermi constant G_F = 1.166371(6) x 10^-5 GeV^-2 (5 ppm). Additionally, the precision measurement of the positive muon lifetime is needed to determine the nucleon pseudoscalar coupling g_P.

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