The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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electron-neutron mass ratio
 $m_{\rm e}/m_{\rm n}$
 Numerical value  5.438 673 4424 x 10-4
 Standard uncertainty  0.000 000 0026 x 10-4
  Relative standard uncertainty  4.8 x 10-10
 Concise form  5.438 673 4424(26) x 10-4    
 
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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