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

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...

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Veröffentlicht in:	Physical review letters 2007-07, Vol.99 (3), p.032001-032001, Article 032001
Hauptverfasser:	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
Format:	Artikel
Sprache:	eng
Schlagworte:	FERMI INTERACTIONS LIFETIME MUON BEAMS MUONS PLUS PHYSICS OF ELEMENTARY PARTICLES AND FIELDS SCINTILLATION COUNTERS
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Zusammenfassung:	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).
ISSN:	0031-9007 1079-7114
DOI:	10.1103/physrevlett.99.032001