The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
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alpha particle-proton mass ratio
 $m_{\rm \alpha}/m_{\rm p}$
 Numerical value  3.972 599 690 09
 Standard uncertainty  0.000 000 000 22
  Relative standard uncertainty  5.5 x 10-11
 Concise form  3.972 599 690 09(22)    
 
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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