The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
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reduced tau Compton wavelength
 $ \lbar_{\rm C,\tau} = \hbar/m_{\rm\tau} c $
 Numerical value  1.110 538 x 10-16 m
 Standard uncertainty  0.000 075 x 10-16 m
  Relative standard uncertainty  6.8 x 10-5
 Concise form  1.110 538(75) x 10-16 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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