The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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alpha particle mass energy equivalent in MeV
 $m_{\rm \alpha}c^2$
 Numerical value  3727.379 4066 MeV
 Standard uncertainty     0.000 0011 MeV
  Relative standard uncertainty  3.0 x 10-10
 Concise form  3727.379 4066(11) MeV    
 
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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