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- W2995438937 abstract "A new precision measurement of the mean lifetime of the positive muon, $ensuremath{tau}({ensuremath{mu}}^{+})$, is described. On the basis of 12 internally consistent, independent determinations performed under a variety of experimental conditions we obtain $ensuremath{tau}({ensuremath{mu}}^{+})=(2.203ifmmodepmelsetextpmfi{}0.004)$ ensuremath{mu}sec. These determinations were performed by means of an improved version of Swanson's digitron---a digital electronic time interval measuring device---embodying a continuous wave (CW) oscillator and several protective features. The available experimental conditions, in particular concerning the percentage of background events, were greatly superior to those available in earlier experiments here and elsewhere. Particular attention was paid to sources of systematic error, such as time dependence of background events and rate dependence of the over-all measuring process. All sources of background have been localized, their effects quantitatively exhibited and, in general, suppressed electronically during actual lifetime determinations.The prediction of the conserved vector-current theory, using $ft({mathrm{O}}^{14})=(3069ifmmodepmelsetextpmfi{}13)$ sec and ${m}_{ensuremath{mu}}=206.76{m}_{e}$, is (including radiative corrections) $ensuremath{tau}({ensuremath{mu}}^{+})=2.298ifmmodepmelsetextpmfi{}0.05$ ensuremath{mu}sec, and thus in disagreement with the experimental value reported here. This discrepancy is even greater than with the somewhat higher values obtained for $ensuremath{tau}({ensuremath{mu}}^{+})$ by other workers; these values are briefly reviewed.A full discussion of the logical operation of the digitron, and of time-interval measuring devices in general, is presented. In Appendix I (by R. Winston) a general formalism is given which establishes the connection between arbitrary interval distributions presented at the input of such devices and their corresponding output interval distributions." @default.
- W2995438937 created "2019-12-26" @default.
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- W2995438937 date "1962-03-01" @default.
- W2995438937 modified "2023-10-18" @default.
- W2995438937 title "Precision Measurement of theμ+Lifetime" @default.
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- W2995438937 doi "https://doi.org/10.1103/physrev.125.1686" @default.
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