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Dispersive Analysis Ofklμ3andkle3scalar and Vector Form Factors Using KTeV Data

Physical review D Particles, fields, gravitation, and cosmology/Physical review D, Particles, fields, gravitation, and cosmology(2010)

Univ Chicago

Cited 25|Views62
Abstract
Using the published KTeV samples of K-L -> pi(+/-)e(-/+)nu and K-L -> pi(+/-)mu(-/+)nu decays, we perform a reanalysis of the scalar and vector form factors based on the dispersive parametrization. We obtain phase-space integrals I-K(e) = 0.15446 +/- 0.00025 and I-K(mu) = 0.10219 +/- 0.00025. For the scalar form factor parametrization, the only free parameter is the normalized form factor value at the Callan-Treiman point (C); our best-fit results in InC = 0.1915 +/- 0.0122. We also study the sensitivity of C to different parametrizations of the vector form factor. The results for the phase-space integrals and C are then used to make tests of the standard model. Finally, we compare our results with lattice QCD calculations of F-K/F-pi and f(+)(0).
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要点】:本文利用KTeV数据对K-L -> pi(+/-)e(-/+)nu和K-L -> pi(+/-)mu(-/+)nu衰变的标量和矢量形式因子进行分散性分析,测试了标准模型,并与格点QCD计算结果进行了比较。

方法】:通过使用分散性参数化方法重新分析标量和矢量形式因子,并基于已发表的KTeV数据样本。

实验】:利用KTeV数据集,得到相空间积分I-K(e)和I-K(mu)的值,以及标量形式因子在Callan-Treiman点的最佳拟合结果,并探究了标量形式因子C对不同矢量形式因子参数化的敏感性。结果用于测试标准模型,并与格点QCD计算结果进行了对比。