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

  title={Improved measurement of the positive-muon lifetime and determination of the Fermi constant.},
  author={D. B. Chitwood and Thomas I. Banks and Michael J. Barnes and S. Battu and R. M. Carey and Santosh Kumar Cheekatmalla and S. M. Clayton and Jason D. Crnkovic and Kenneth M. Crowe and P. T. Debevec and Seema Dhamija and W. Earle and Aleksandr Gafarov and Kevin Giovanetti and T. P. Gorringe and F. Gray and Michael Hance and D. W. Hertzog and M. Hare and Peter Kammel and Brendan Kiburg and Joshua Milo Kunkle and Bernhard Lauss and I. Logashenko and Kevin R. Lynch and R. McNabb and Jonathan Miller and Françoise Mulhauser and C. J. G. Onderwater and Cenap S. Ozben and Q. Peng and C. Polly and Shubhalaxmi Rath and B. L. Roberts and Vladimir Tishchenko and G. D. Wait and Joachim Wasserman and David M. Webber and Peter Winter and Piotr A. Zolnierczuk},
  journal={Physical review letters},
  volume={99 3},
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… 
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