The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
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Correlation coefficient between two constants
tau energy equivalent
 $m_{\rmsstau}c^2$
 Numerical value  1776.86 MeV
 Standard uncertainty     0.12 MeV
  Relative standard uncertainty  6.8 x 10-5
 Concise form  1776.86(12) MeV    
 
Source: 2018 CODATA     
recommended values 		 Definition of
uncertainty 		       Correlation coefficient with
any other constant

 
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