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. 2007 Jul 20;99(3):032001.
doi: 10.1103/PhysRevLett.99.032001. Epub 2007 Jul 16.

Improved measurement of the positive-muon lifetime and determination of the Fermi constant

D B Chitwood  1 , T I Banks, M J Barnes, S Battu, R M Carey, S Cheekatmalla, S M Clayton, J Crnkovic, K M Crowe, P T Debevec, S Dhamija, W Earle, A Gafarov, K Giovanetti, T P Gorringe, F E Gray, M Hance, D W Hertzog, M F Hare, P Kammel, B Kiburg, J Kunkle, B Lauss, I Logashenko, K R Lynch, R McNabb, J P Miller, F Mulhauser, C J G Onderwater, C S Ozben, Q Peng, C C Polly, S Rath, B L Roberts, V Tishchenko, G D Wait, J Wasserman, D M Webber, P Winter, P A Zołnierczuk; MuLan Collaboration
Affiliations

Improved measurement of the positive-muon lifetime and determination of the Fermi constant

D B Chitwood et al. Phys Rev Lett. .

Abstract

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(micro)=2.197 013(24) micros, is in excellent agreement with the previous world average. The new world average tau(micro)=2.197 019(21) micros determines the Fermi constant G(F)=1.166 371(6)x10(-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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