The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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electron to alpha particle mass ratio
 $m_{\rm e}/m_\alpha$
 Numerical value  1.370 933 554 787 x 10-4
 Standard uncertainty  0.000 000 000 045 x 10-4
  Relative standard uncertainty  3.3 x 10-11
 Concise form  1.370 933 554 787(45) 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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