The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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alpha particle mass
 $m_{\rm \alpha}$
 Numerical value  6.644 657 3357 x 10-27 kg
 Standard uncertainty  0.000 000 0020 x 10-27 kg
  Relative standard uncertainty  3.0 x 10-10
 Concise form  6.644 657 3357(20) x 10-27 kg    
 
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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