Abstract
A first measurement of the positive muon lifetime—to a precision of 16 parts per million (ppm)—has been performed with the FAST detector at the Paul Scherrer Institute (PSI). The obtained result, compatible with the present world average and of comparable precision, is τμ+ = 2.197 083 (32) (15) μs, the first error being statistical and the second systematic. The Fermi coupling constant GF, derived from the reported measurement of the muon lifetime, is GF = [1.166353 (9)]×10−5 GeV−2.
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