The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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Planck constant over 2 pi times c in MeV fm
 $ \hbar c $
 Value  197.326 9788 MeV fm
 Standard uncertainty    0.000 0012 MeV fm
  Relative standard uncertainty   6.1 x 10-9
 Concise form  197.326 9788(12) MeV fm    
 
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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