The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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electron-tau mass ratio
 $m_{\rm e}/m_{\rm \tau}$
 Value  2.875 92 x 10-4
 Standard uncertainty  0.000 26 x 10-4
  Relative standard uncertainty   9.0 x 10-5
 Concise form  2.875 92(26) x 10-4    
 
Click here for correlation coefficient of this constant with other constants
Source: 2014 CODATA     
recommended values
 
Definition of
uncertainty
 
     Correlation coefficient with
any other constant

 
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