The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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alpha particle mass in u
$m_{\rm \alpha}$
 Value  4.001 506 179 127 u
 Standard uncertainty  0.000 000 000 062 u
  Relative standard uncertainty   1.5 x 10-11
 Concise form  4.001 506 179 127(62) u    
 
Click here for correlation coefficient of this constant with other constants
Source: 2006 CODATA     
recommended values 		 Definition of
uncertainty 		      Correlation coefficient with
any other constant

 
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