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arXiv 0710.4470hep-ex
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用KLOE探测器测量K_L \to πμν形状因子参数

Measurement of the K_L \to πμνform factor parameters with the KLOE detector

KLOE Collaboration

摘要:

利用在DAFNE收集的328 pb^{-1}的数据,对应于$\sim$ 180万$K_L\to πμν$衰变,我们测量了$K_{μ3}$形状因子参数。$K-π$矢量流的结构提供了强相互作用动力学的信息;它的知识对于测量CKM矩阵元$V_{us}$所需的相空间积分的评估和K介子衰变中轻子普适性的测试是必要的。使用矢量和标量形状因子的新参数化,我们发现$λ_+$ = \pt(25.7 \pm 0.6),-3,和$λ_0$ = \pt(14.0 \pm 2.1),-3,.我们对$λ_0$的结果,以及最近对$f_π$,$f_K$和$f(0)$的晶格计算,满足Callan-Trieman关系

英文摘要:

Using 328 pb^{-1}of data collected at DAFNE corresponding to $\sim$ 1.8 million $K_L\to πμν$ decays, we have measured the $K_{μ3}$ form factor parameters. The structure of the $K-π$ vector-current provides information about the dynamics of the strong interaction; its knowledge is necessary for evaluation of the phase-space integral required for measuring the CKM matrix element $V_{us}$ and for testing lepton universality in kaon decays. Using a new parametrization for the vector and scalar form factors, we find $λ_+$=\pt(25.7\pm 0.6),-3, and $λ_0$=\pt(14.0\pm 2.1),-3,. Our result for $λ_0$, together with recent lattice calculations of $f_π$, $f_K$ and $f(0)$, satisfies the Callan-Trieman relation

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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