The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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Constants,
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alpha particle mass energy equivalent in MeV
 $m_{\rm \alpha}c^2$
 Value  3727.379 378 MeV
 Standard uncertainty     0.000 023 MeV
  Relative standard uncertainty   6.2 x 10-9
 Concise form  3727.379 378(23) MeV    
 
Click here for correlation coefficient of this constant with other constants
Source: 2014 CODATA     
recommended values
 
Definition of
uncertainty
 
     Correlation coefficient with
any other constant

 
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