A Determination of the CKM Parameter |Vus|
KTeV Collaboration: T. Alexopoulos, et al
TL;DR
This paper reports a precise determination of the CKM matrix element |Vus| using new measurements of KL decay modes and form factors, contributing to the understanding of quark mixing and CP violation.
Contribution
It provides a new measurement of |Vus| and CP violation parameter |eta+-| based on updated experimental data from the KTeV experiment at Fermilab.
Findings
|Vus| = 0.2252 with combined uncertainties
|eta+-| = 2.228 x 10^-3 with uncertainties
Enhanced precision in CKM and CP violation parameters
Abstract
We present a determination of the CKM 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 +- 0.0008(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)]E-3.
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