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arXiv 1111.2021hep-lat
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交错夸克的K -> pil nu形状因子

K -> pi l nu form factors with staggered quarks

E. Gamiz, C. DeTar, A. X. El-Khadra, A. S. Kronfeld, P. B. Mackenzie, J. Simone

摘要:

本文报道了用Fermilab-MILC方法计算提取CKM矩阵元所需的形状因子f_+^{Kpi}(0)的情况|V_{us}|从K半轻子衰变的实验数据。对价夸克采用HISQ公式,对海夸克采用asqtad作用量(MILC N_f=2+1组态)。我们讨论了计算的一般方法,包括使用扭曲的边界条件,以获得接近于零的动量传递值和不同的技术应用于的反射器适合。我们给出了晶格间距a=0.12fm和a=0.09fm的初步结果,以及轻夸克质量的几种选择。

英文摘要:

We report on the status of the Fermilab-MILC calculation of the form factor f_+^{K pi}(0), needed to extract the CKM matrix element |V_{us}| from experimental data on K semileptonic decays. The HISQ formulation is used in the simulations for the valence quarks, while the sea quarks are simulated with the asqtad action (MILC N_f=2+1 configurations). We discuss the general methodology of the calculation, including the use of twisted boundary conditions to get values of the momentum transfer close to zero and the different techniques applied for the correlators fits. We present initial results for lattice spacings a=0.12fm and a=0.09fm, and several choices of the light quark masses.

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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