Measurement of the Fermi Constant by FAST
A. Barczyk, J. Kirkby, L. Malgeri (CERN), J. Berdugo, J. Casaus, C., Mana, J. Marin, G. Martinez, E. Sanchez, C. Willmott (CIEMAT), C. Casella, M., Pohl (University of Geneva), K. Deiters, P. Dick, C. Petitjean (PSI) (for the, FAST Collaboration)
TL;DR
This paper reports a precise measurement of the muon lifetime using the FAST detector, leading to an improved determination of the Fermi constant with 8 ppm accuracy.
Contribution
First high-precision measurement of muon lifetime at FAST, refining the Fermi constant with 16 ppm precision.
Findings
Muon lifetime measured as 2.197083 microseconds
Fermi constant determined as 1.166353 x 10^-5 GeV^-2
Achieved 8 ppm accuracy in G_F
Abstract
An initial measurement of the lifetime of the positive muon to a precision of 16 parts per million (ppm) has been performed with the FAST detector at the Paul Scherrer Institute. The result is tau_mu = 2.197083 (32) (15) microsec, where the first error is statistical and the second is systematic. The muon lifetime determines the Fermi constant, G_F = 1.166353 (9) x 10^-5 GeV^-2 (8 ppm).
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