The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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Thomson cross section
 $\sigma_{\rm e}$
 Value  0.665 245 871 58 x 10-28 m2
 Standard uncertainty  0.000 000 000 91 x 10-28 m2
  Relative standard uncertainty   1.4 x 10-9
 Concise form  0.665 245 871 58(91) x 10-28 m2    
 
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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