The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
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tau mass in u
 $ m_{\rm\tau}/{\rm u} = m_{\rm\tau}/m_{\rm u} $
 Numerical value  1.907 54 u
 Standard uncertainty  0.000 13 u
  Relative standard uncertainty  6.8 x 10-5
 Concise form  1.907 54(13) u    
 
Click here for correlation coefficient of this constant with other constants
Source: 2018 CODATA     
recommended values 		 Definition of
uncertainty 		      Correlation coefficient with
any other constant

 
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