This ratio is used to obtain a precise value of the muon mass and to reduce experimental muon Larmor frequency measurements to the muon magnetic moment anomaly. Measurements with an error $>$ $0.00001$ have been omitted. By convention, the minus sign on this ratio is omitted. CODATA values were fitted using their selection of data, plus other data from multiparameter fits.

VALUE DOCUMENT ID TECN CHG  COMMENT $3.183345142$ $\pm0.000000071$ TIESINGA 2021 RVUE 2018 CODATA value • • We do not use the following data for averages, fits, limits, etc. • • $3.183345142$ $\pm0.000000071$ MOHR 2016 RVUE 2014 CODATA value $3.183345107$ $\pm0.000000084$ MOHR 2012 RVUE 2010 CODATA value $3.183345137$ $\pm0.000000085$ MOHR 2008 RVUE 2006 CODATA value $3.183345118$ $\pm0.000000089$ MOHR 2005 RVUE 2002 CODATA value $3.18334513$ $\pm0.00000039$ LIU 1999 CNTR + HFS in muonium $3.18334539$ $\pm0.00000010$ MOHR 1999 RVUE 1998 CODATA value $3.18334547$ $\pm0.00000047$ COHEN 1987 RVUE 1986 CODATA value $3.1833441$ $\pm0.0000017$ KLEMPT 1982 CNTR + Precession strob $3.1833461$ $\pm0.0000011$ MARIAM 1982 CNTR + HFS splitting $3.1833448$ $\pm0.0000029$ CAMANI 1978 CNTR + See KLEMPT 1982 $3.1833403$ $\pm0.0000044$ CASPERSON 1977 CNTR + HFS splitting $3.1833402$ $\pm0.0000072$ COHEN 1973 RVUE 1973 CODATA value $3.1833467$ $\pm0.0000082$ CROWE 1972 CNTR + Precession phase

References