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  1.166 364 x 10-5 GeV-2
 Standard uncertainty  0.000 005 x 10-5 GeV-2
  Relative standard uncertainty   4.3 x 10-6
 Concise form  1.166 364(5) x 10-5 GeV-2    
 
Click here for correlation coefficient of this constant with other constants
Source: 2010 CODATA     
recommended values 		 Definition of
uncertainty 		      Correlation coefficient with
any other constant

 
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