The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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muon mass
$m_{\rm \mu}$
 Value  1.883 531 594 x 10-28 kg
 Standard uncertainty  0.000 000 048 x 10-28 kg
  Relative standard uncertainty   2.5 x 10-8
 Concise form  1.883 531 594(48) x 10-28 kg    
 
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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