The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
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tau mass energy equivalent in MeV
$m_{\rm \tau}c^2$
 Value  1776.99 MeV
 Standard uncertainty     0.29 MeV
  Relative standard uncertainty   1.6 x 10-4
 Concise form  1776.99(29) MeV    
 
Click here for correlation coefficient of this constant with other constants
Source: 2006 CODATA     
recommended values 		 Definition of
uncertainty 		      Correlation coefficient with
any other constant

 
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