The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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electron-proton magnetic moment ratio
 $\mu_{\rm e}/\mu_{\rm p}$
 Value  -658.210 6866
 Standard uncertainty     0.000 0020
  Relative standard uncertainty   3.0 x 10-9
 Concise form  -658.210 6866(20)    
 
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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