The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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electron-muon magnetic moment ratio
 $\mu_{\rm e}/\mu_{\rm \mu}$
 Value  206.766 9880
 Standard uncertainty    0.000 0046
  Relative standard uncertainty   2.2 x 10-8
 Concise form  206.766 9880(46)    
 
Click here for correlation coefficient of this constant with other constants
Source: 2014 CODATA     
recommended values
 
Definition of
uncertainty
 
     Correlation coefficient with
any other constant

 
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