The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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proton Compton wavelength
 $\lambda_{\rm C,p}$
 Value  1.321 409 853 96 x 10-15 m
 Standard uncertainty  0.000 000 000 61 x 10-15 m
  Relative standard uncertainty   4.6 x 10-10
 Concise form  1.321 409 853 96(61) x 10-15 m    
 
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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