The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
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electron magnetic moment anomaly
 $ a_{\rm e} = |\mu_{\rm e}|/\mu_{\rm B} -1 = |\mu_{\rm e}|/(e\hbar/2m_{\rm e}) -1$
 Numerical value  1.159 652 181 28 x 10-3
 Standard uncertainty  0.000 000 000 18 x 10-3
  Relative standard uncertainty  1.5 x 10-10
 Concise form  1.159 652 181 28(18) x 10-3    
 
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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