The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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tau-muon mass ratio
 $m_{\rmsstau}/m_{\rmssmu}$
 Numerical value  16.8170
 Standard uncertainty   0.0011
  Relative standard uncertainty  6.8 x 10-5
 Concise form  16.8170(11)    
 
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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