The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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muon-electron mass ratio
 $m_{\rmssmu}/m_{\rm e}$
 Numerical value  206.768 2830
 Standard uncertainty    0.000 0046
  Relative standard uncertainty  2.2 x 10-8
 Concise form  206.768 2830(46)    
 
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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