The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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Correlation coefficient between two constants
muon mass energy equivalent
 $m_{\rmssmu}c^2$
 Numerical value  1.692 833 804 x 10-11 J
 Standard uncertainty  0.000 000 038 x 10-11 J
  Relative standard uncertainty  2.2 x 10-8
 Concise form  1.692 833 804(38) x 10-11 J    
 
Source: 2018 CODATA     
recommended values 		 Definition of
uncertainty 		       Correlation coefficient with
any other constant

 
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