Precision measurement of the positive muon lifetime by the MuLan collaboration

We report the result of a measurement of the positive muon lifetime τμ to one part-per-million (ppm) by the MuLan collaboration using a low-energy pulsed muon beam and a segmented array of plastic scintillators to record over 2×1012 decay positrons. Two different in-vacuum muon-stopping targets were...

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Bibliographic Details
Published in:Nuclear physics. Section B, Proceedings supplement Proceedings supplement, 2012-04, Vol.225-227, p.232-235
Main Author: Tishchenko, V.
Format: Article
Language:English
Subjects:
Fermi constant
Muon lifetime
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Summary:We report the result of a measurement of the positive muon lifetime τμ to one part-per-million (ppm) by the MuLan collaboration using a low-energy pulsed muon beam and a segmented array of plastic scintillators to record over 2×1012 decay positrons. Two different in-vacuum muon-stopping targets were used in separate data-taking periods. The combined result gives τμ+(MuLan)=2196980.3(2.2)ps(1ppm). This measurement of the muon lifetime provides the most precise determination of the Fermi constant, GF(MuLan)=1.1663788(7)×10−5 GeV−2(0.6 ppm), and will be used to extract the capture rates of the negative muon on the proton and the deuteron in the ongoing MuCap and MuSun experiments.
ISSN:0920-5632
1873-3832
DOI:10.1016/j.nuclphysbps.2012.02.048