Improved measurement of the positive-muon lifetime and determination of the Fermi constant
- Chitwood, D. B.
- Banks, T. I.
- Barnes, M. J.
- Battu, S.
- Carey, R. M.
- Cheekatmalla, S.
- Clayton, S. M.
- Crnkovic, J.
- Crowe, K. M.
- Debevec, P. T.
- Dhamija, S.
- Earle, W.
- Gafarov, A.
- Giovanetti, K.
- Gorringe, T. P.
- Gray, F. E.
- Hance, M.
- Hertzog, D. W.
- Hare, M. F.
- Kammel, P.
- Kiburg, B.
- Kunkle, J.
- Lauss, B.
- Logashenko, I.
- Lynch, K. R.
- McNabb, R.
- Miller, J. P.
- Mulhauser, F.
- Onderwater, C. J. G.
- Oezben, C. S.
- Peng, Q.
- Polly, C. C.
- Rath, S.
- Roberts, B. L.
- Tishchenko, V.
- Wait, G. D.
- Wasserman, J.
- Webber, D. M.
- Winter, P.
- Zolnierczuk, P. A.
- null, null
- Ozben, C.
Publication date
July 2007
DOIAbstract
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) mu s, is in excellent agreement with the previous world average. The new world average tau(mu)=2.197019(21) mu s determines the Fermi constant G(F)=1.166371(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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