The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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muon g factor
 $g_{\rmssmu^-}$
 Numerical value  -2.002 331 8418
 Standard uncertainty   0.000 000 0013
  Relative standard uncertainty  6.3 x 10-10
 Concise form  -2.002 331 8418(13)    
 
Click here for correlation coefficient of this constant with other constants
Source: 2018 CODATA     
recommended values 		 Definition of
uncertainty 		      Correlation coefficient with
any other constant

 
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