Improved measurement of the positive-muon lifetime and determination of the Fermi constant.
作者信息
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, Ozben C S, Peng Q, Polly C C, Rath S, Roberts B L, Tishchenko V, Wait G D, Wasserman J, Webber D M, Winter P, Zołnierczuk P A
机构信息
Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.
出版信息
Phys Rev Lett. 2007 Jul 20;99(3):032001. doi: 10.1103/PhysRevLett.99.032001. Epub 2007 Jul 16.
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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