APS » PROLA » Phys. Rev. Lett. » Volume 93 » Issue 18

Phys. Rev. Lett. 93, 181802 (2004) [4 pages]

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

Download: PDF (120 kB) or Buy this Article (Use Article Pack) Export: BibTeX or EndNote (RIS)

T. Alexopoulos et al. KTeV Collaboration
Show All Authors/Affiliations

Received 1 June 2004; published 25 October 2004

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)×10-3.


©2004 The American Physical Society

URL: http://link.aps.org/abstract/PRL/v93/e181802
DOI: 10.1103/PhysRevLett.93.181802
PACS: 12.15.Hh, 13.20.Eb, 13.25.Es

* Permanent address: University of São Paulo, São Paulo, Brazil.
† Deceased.
‡ Permanent address: C.P.P. Marseille/C.N.R.S., France.
§ Permanent address: University of São Paulo, São Paulo, Brazil.

[ Abstract  |  Previous article  |  Next article  |  Issue 18 ]