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(mu)=2.197013(24) mu s, is in excellent agreement with the previous world average. The new world average tau(mu)=2.197019(21) mu s determines the Fermi constant G(F)=1.166371(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).
Original language | English |
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Journal | Physical Review Letters |
Volume | 99 |
Issue number | 3 |
DOIs | |
Publication status | Published - 20 Jul 2007 |
Externally published | Yes |
Keywords
- RADIATIVE-CORRECTIONS
- NEUTRON DECAY