The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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Constants,
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Uncertainty
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proton-muon mass ratio
 $m_{\rm p}/m_{\rm \mu}$
 Value  8.880 243 38
 Standard uncertainty  0.000 000 20
  Relative standard uncertainty   2.2 x 10-8
 Concise form  8.880 243 38(20)    
 
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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