The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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Fermi coupling constant
 $G_{\rm F}/(\hbar c)^3$
 Value  1.166 3787 x 10-5 GeV-2
 Standard uncertainty  0.000 0006 x 10-5 GeV-2
  Relative standard uncertainty   5.1 x 10-7
 Concise form  1.166 3787(6) x 10-5 GeV-2    
 
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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