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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weak mixing angle
 $\sin^2\theta_{\rm W}$
 Value  0.2223
 Standard uncertainty  0.0021
  Relative standard uncertainty   9.5 x 10-3
 Concise form  0.2223(21)    
 
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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