Measurement of the Fermi constant by FAST

Barczyk, A.
Kirkby, J.
Malgeri, L.
Berdugo, J.
Casaus, J.
Mañá, C.
Marín, J.
Martínez, G.
Sánchez, E.
Willmott, C.
Casella, Maria Chiara
Pohl, Martin
Deiters, K.
Dick, P.
Petitjean, C.

Open link

Publication date

January 2008

DOI

10.1016/j.physletb.2008.04.006

Publisher

Elsevier BV

ISSN

0370-2693

Citation count (estimate)

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 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)