The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
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alpha particle-electron mass ratio
 $m_{\rm \alpha}/m_{\rm e}$
 Numerical value  7294.299 541 42
 Standard uncertainty     0.000 000 24
  Relative standard uncertainty  3.3 x 10-11
 Concise form  7294.299 541 42(24)    
 
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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