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arXiv 0810.3323hep-ex
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在KLOE上与K介子物理的么正性和普适性

Unitarity and universality with kaon physics at KLOE

Erika De Lucia

摘要:

从\kl、\ks和\kpm衰变中提取CKM矩阵元\vus的所有相关输入都已在KLOE测量。从一个全球性的拟合只使用KLOE的结果,但\ks寿命,值$|\vus|\fzero = 0.2157 \pm 0.0006$,其中\fzero是形状因子参数化的强子矩阵元在零动量转移。比较了$K_{e3}$和$K_{\mu3}$模式的\fVus值,在0.8%的精度水平上检验了轻子的普适性。使用$\BR(\kpm \to \mudue)$的KLOE测量和衰减常数$f_K/f_π$的比率的晶格计算,从比率$Γ(K\toμν)/Γ(π\toμν)$获得值$\vus/\vud=0.2323(15)$。这些结果与$\vud = 0.97418(26)$一起,在0.6 $σ$水平上与CKM矩阵酉性相容。轻子和夸克弱耦合的普适性可以被检验,标准模型的新物理扩展的约束可以使用这些非常精确的K介子衰变测量来设定。

英文摘要:

All relevant inputs for the extraction of the CKM matrix element \vus from \kl, \ks and \kpm decays have been measured at KLOE. From a global fit using only KLOE results, but \ks lifetime, a value of $|\vus|\fzero = 0.2157 \pm 0.0006$ is obtained, where \fzero is the form factor parametrizing the hadronic matrix element evaluated at zero momentum transfer. Comparison of the values of \fVus for $K_{e3}$ and $K_{\mu3}$ modes provides a test of lepton universality at 0.8% level of accuracy. The value $\vus/\vud=0.2323(15)$ has been obtained from the ratio $Γ(K\toμν)/Γ(π\toμν)$ using KLOE measurement of $\BR(\kpm \to \mudue)$ and lattice calculation of the ratio of decay constants $f_K/f_π$. These results, together with $\vud = 0.97418(26)$, are compatible at 0.6$σ$ level with CKM matrix unitarity. The universality of lepton and quark weak couplings can be tested and constraints on new physics extensions of the Standard Model can be set using these very precise measurements from kaon decays.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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