Vus determination from KLOE

被引：0
|
作者：
De Lucia, Erika [1 ]
机构：
[1] Lab Nazl Frascati INFN, Rome, Italy
来源：
2007 EUROPHYSICS CONFERENCE ON HIGH ENERGY PHYSICS, PTS 1-12 | 2008年 / 110卷
关键词：
D O I：
10.1088/1742-6596/110/5/052011
中图分类号：
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号：
摘要：
KLOE recent experimental results on K-L, K-S and K-+/- decays relevant for the extraction of the CKM matrix element V-us are reported, including the preliminary measurement of BR(K-pi 2(+)) presented at this conference. From a global fit using only KLOE results a value of vertical bar V-us vertical bar f(+)(0) = 0.21556 +/- 0.00059 is obtained, where f(+)(0) is the form factor parametrizing the hadronic matrix element evaluated at zero momentum transfer. From the ratio of the radiative inclusive decay rates of K-+/- -> mu(+/-)nu(gamma) and pi(+/-) -> mu(+/-)nu(gamma), combined with the KLOE measurement of BR(K-+/- -> mu(+/-)nu) and the lattice calculation of the ratio of decay constants f(K)/f(pi) = 1.189(7), the value V-us/V-ud = 0.2323(15) has been obtained. These results, together with V-ud = 0.97372(26), are compatible at 1.5 sigma level with CKM matrix unitarity.
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