The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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alpha particle mass
$m_{\rm \alpha}$
 Value  6.644 656 75 x 10-27 kg
 Standard uncertainty  0.000 000 29 x 10-27 kg
  Relative standard uncertainty   4.4 x 10-8
 Concise form  6.644 656 75(29) x 10-27 kg    
 
Click here for correlation coefficient of this constant with other constants
Source: 2010 CODATA     
recommended values 		 Definition of
uncertainty 		      Correlation coefficient with
any other constant

 
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