The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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electron-muon mass ratio
 $m_{\rm e}/m_{\rmssmu}$
 Numerical value  4.836 331 69 x 10-3
 Standard uncertainty  0.000 000 11 x 10-3
  Relative standard uncertainty  2.2 x 10-8
 Concise form  4.836 331 69(11) x 10-3    
 
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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