The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
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neutron-proton mass difference in u
 $m_{\rm n}-m_{\rm p}$
 Numerical value  1.388 449 33 x 10-3 u
 Standard uncertainty  0.000 000 49 x 10-3 u
  Relative standard uncertainty  3.5 x 10-7
 Concise form  1.388 449 33(49) x 10-3 u    
 
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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