Improved measurement of the positive-muon lifetime and determination of the Fermi constant.
نویسندگان
چکیده
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).
منابع مشابه
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عنوان ژورنال:
- Physical review letters
دوره 99 3 شماره
صفحات -
تاریخ انتشار 2007