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A determination of the Cabibbo-Kobayashi-Maskawa parameter |V us| using KL decays |
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| Authors: | Alexopoulos T Arenton M Barbosa R F Barker A R Bellantoni L Bellavance A Blucher E Bock G J Cheu E Childress S Coleman R Corcoran M D Cox B Erwin A R Ford R Glazov A Golossanov A Graham J Hamm J Hanagaki K Hsiung Y B Huang H Jejer V Jensen D A Kessler R Kobrak H G E Kotera K LaDue J Ledovskoy A McBride P L Monnier E Nelson K S Nguyen H Niclasen R Prasad V Qi X R Ramberg E J Ray R E Ronquest M Santos E Shanahan P Shields J Slater W Smith D Solomey N Swallow E C Toale P A Tschirhart R Wah Y W Wang J White H B Whitmore J Wilking M Winstein B Winston R Worcester E T Yamanaka T |
| Affiliation: | University of Wisconsin, Madison, WI 53706, USA. |
| 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). |
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