The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
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muon-neutron mass ratio
 $m_{\rmssmu}/m_{\rm n}$
 Numerical value  0.112 454 5170
 Standard uncertainty  0.000 000 0025
  Relative standard uncertainty  2.2 x 10-8
 Concise form  0.112 454 5170(25)    
 
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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