The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
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reduced muon Compton wavelength
 $\lbar_{\rm C,\rmssmu}$
 Numerical value  1.867 594 306 x 10-15 m
 Standard uncertainty  0.000 000 042 x 10-15 m
  Relative standard uncertainty  2.2 x 10-8
 Concise form  1.867 594 306(42) x 10-15 m    
 
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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