A determination of the Cabibbo-Kobayashi-Maskawa parameter |V us| using KL decays

T Alexopoulos; M Arenton; R F Barbosa; A R Barker; L Bellantoni; A Bellavance; E Blucher; G J Bock; E Cheu; S Childress; R Coleman; M D Corcoran; B Cox; A R Erwin; R Ford; A Glazov; A Golossanov; J Graham; J Hamm; K Hanagaki; Y B Hsiung; H Huang; V Jejer; D A Jensen; R Kessler; H G E Kobrak; K Kotera; J LaDue; A Ledovskoy; P L McBride; E Monnier; K S Nelson; H Nguyen; R Niclasen; V Prasad; X R Qi; E J Ramberg; R E Ray; M Ronquest; E Santos; P Shanahan; J Shields; W Slater; D Smith; N Solomey; E C Swallow; P A Toale; R Tschirhart; Y W Wah; J Wang; H B White; J Whitmore; M Wilking; B Winstein; R Winston; E T Worcester; T Yamanaka; E D Zimmerman; KTeV Collaboration

doi:10.1103/PhysRevLett.93.181802

A determination of the Cabibbo-Kobayashi-Maskawa parameter |V us| using KL decays

Phys Rev Lett. 2004 Oct 29;93(18):181802. doi: 10.1103/PhysRevLett.93.181802. Epub 2004 Oct 25.

Authors

Affiliation

¹ University of Wisconsin, Madison, WI 53706, USA.

PMID: 15525151
DOI: 10.1103/PhysRevLett.93.181802

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).