The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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helion-electron mass ratio
 $m_{\rm h}/m_{\rm e}$
 Numerical value  5495.885 279 84
 Standard uncertainty     0.000 000 16
  Relative standard uncertainty  2.9 x 10-11
 Concise form  5495.885 279 84(16)    
 
Click here for correlation coefficient of this constant with other constants
Source: 2022 CODATA     
recommended values 		 Definition of
uncertainty 		      Correlation coefficient with
any other constant

 
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