The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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deuteron-proton mass ratio
 $m_{\rm d}/m_{\rm p}$
 Value  1.999 007 500 87
 Standard uncertainty  0.000 000 000 19
  Relative standard uncertainty   9.3 x 10-11
 Concise form  1.999 007 500 87(19)    
 
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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