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

2004/06/01 by KTeV Collaboration, T. Alexopoulos, W. To +56 · 3 citations
Physics and Astronomy · #Fermilab #High-Energy Particle Collisions Research #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #hep-ex

paper · pdf · doi:10.1103/physrevlett.93.181802

published as Phys.Rev.Lett.93:181802,2004 · Submitted to Phys. Rev. Lett.; 4 pages, 4 figures

arxiv created 2004/06/01 · openalex publication_date 2004/10/25 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We present a determination of the Cabibbo-Kobayashi-Maskawa parameter |V_us| based on new measurements of the six largest K_L branching fractions and semileptonic form factors by the KTeV (E832) experiment at Fermilab. We find |V_us|=0.2252\ifmmode±\else\textpm\fi0.0008_KTeV\ifmmode±\else\textpm\fi0.0021_ext, where the errors are from KTeV measurements and from external sources. We also use the measured branching fractions to determine the CP violation parameter |\ensuremathη_+\ensuremath-|=(2.228\ifmmode±\else\textpm\fi0.005_KTeV\ifmmode±\else\textpm\fi0.009_ext)\ifmmode×\else\texttimes\fi10^\ensuremath-3.

Citations

• CP-Violation in the Renormalizable Theory of Weak Interaction

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