A determination of the cabibbo-kobayashi-maskawa parameter |V US | using K L decays
Journal
Physical Review Letters
Journal Volume
93
Journal Issue
18
Pages
181802-1-181802-4
Date Issued
2004
Author(s)
Alexopoulos, T. et al. (KTeV Collaboration)
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+/-0.0008(KTeV)+/-0.0021(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 |eta(+-)|=(2.228+/-0.005(KTeV)+/-0.009(ext))x10(-3).
Type
journal article