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We present a determination of the CKM parameter |Vus| based on newmeasurements of the six largest KL branching fractions and semileptonic formfactors by the KTeV (E832) experiment at Fermilab. We find |Vus| = 0.2252 +-0.0008(KTeV) +- 0.0021(ext), where the errors are from KTeV measurements andfrom external sources. We also use the measured branching fractions todetermine the CP violation parameter |eta+-| = [2.228 +- 0.005(KTeV) +-0.009(ext)]E-3.Comment: Submitted to Phys. Rev. Lett.; 4 pages, 4 figure

physical review letters

A Determination of the Cabibbo-Kobayashi-Maskawa Parameter<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mo stretchy="false">|</mml:mo><mml:msub><mml:mi>V</mml:mi><mml:mrow><mml:mi>u</mml:mi><mml:mi>s</mml:mi></mml:mrow></mml:msub><mml:mo stretchy="false">|</mml:mo></mml:math>_ Using<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>K</mml:mi><mml:mi>L</mml:mi></mml:msub></mml:math>Decays

A Determination of the Cabibbo-Kobayashi-Maskawa Parameter|Vus|_ UsingKLDecays