The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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muon mass energy equivalent in MeV
 $m_{\rmssmu}c^2$
 Numerical value  105.658 3755 MeV
 Standard uncertainty    0.000 0023 MeV
  Relative standard uncertainty  2.2 x 10-8
 Concise form  105.658 3755(23) MeV    
 
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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