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Precision measurement of the positive muon lifetime by the MuLan collaboration

By C. J. G. Onderwater

Abstract

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)×10−5GeV−2(0.6ppm), 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

Topics: To be checked by Faculty
Year: 2012
DOI identifier: 10.1016/j.nuclphysbps.2012.02.048
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Provided by: NARCIS
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