A Determination of the Cabibbo-Kobayashi-Maskawa Parameter |Vus|_ Using KL Decays

T. Alexopoulos et al. (KTeV Collaboration)
Phys. Rev. Lett. 93, 181802 – Published 25 October 2004

Abstract

We present a determination of the Cabibbo-Kobayashi-Maskawa parameter |Vus| based on new measurements of the six largest KL branching fractions and semileptonic form factors by the KTeV (E832) experiment at Fermilab. We find |Vus|=0.2252±0.0008KTeV±0.0021ext, where the errors are from KTeV measurements and from external sources. We also use the measured branching fractions to determine the CP violation parameter |η+|=(2.228±0.005KTeV±0.009ext)×103.

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  • Received 1 June 2004

DOI:https://doi.org/10.1103/PhysRevLett.93.181802

©2004 American Physical Society

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Vol. 93, Iss. 18 — 29 October 2004

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