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; 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; Zolnierczuk, P A

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; Zolnierczuk, P A.

Afiliação

Chitwood DB; Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.

Phys Rev Lett ; 99(3): 032001, 2007 Jul 20.

Article em En | MEDLINE | ID: mdl-17678280

ABSTRACT

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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Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Phys Rev Lett Ano de publicação: 2007 Tipo de documento: Article País de afiliação: Estados Unidos

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