The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
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proton-muon mass ratio
 $m_{\rm p}/m_{\rmssmu}$
 Numerical value  8.880 243 37
 Standard uncertainty  0.000 000 20
  Relative standard uncertainty  2.2 x 10-8
 Concise form  8.880 243 37(20)    
 
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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