The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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helion-proton mass ratio
$m_{\rm h}/m_{\rm p}$
 Value  2.993 152 670 46
 Standard uncertainty  0.000 000 000 29
  Relative standard uncertainty   9.6 x 10-11
 Concise form  2.993 152 670 46(29)    
 
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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