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Barczyk, A.; Kirkby, J.; Malgeri, L.; Berdugo, J.; Casaus, J.; Mañá, C.; Marín, J.; Martínez, G.; Sánchez, E.; Willmott, C.; Casella, C.; Pohl, M.; Deiters, K.; Dick, P.; Petitjean, C.
Physics letters. B, 05/2008, Letnik: 663, Številka: 3Journal Article
An initial measurement of the lifetime of the positive muon to a precision of 16 parts per million (ppm) has been performed with the FAST1 detector at the Paul Scherrer Institute. The result is τμ=2.197083(32)(15)μs, where the first error is statistical and the second is systematic. The muon lifetime determines the Fermi constant, GF=1.166352(9)×10−5GeV−2 (8 ppm).
