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arXiv 0810.4328hep-lat
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混合action格点量子色动力学的轻赝标介子质量和衰变常数

Light pseudoscalar meson masses and decay constants from mixed action lattice QCD

Christopher Aubin, Jack Laiho, Ruth S. Van de Water

摘要:

用畴壁价夸克和2+1味动力学交错夸克计算了轻赝标衰变常数fpi和fK及其比值。使用的MILC规范配置允许我们模拟在几个海夸克质量和空间体积,并与两个晶格间距。我们研究了我们的数值晶格数据的光衰减常数和介子质量是如何描述的次领先阶SU(3)混合作用手征微扰理论,并解释我们的手征和连续外推的策略。将我们对f_K/f_pi的结果与π介子和K介子轻子衰变的实验测量相结合,可以独立于模型确定|V_us| / |V_ud| ;我们发现初步值为|V_us| / |V_ud| = 0.2315(45)(7)。

英文摘要:

We calculate the light pseudoscalar decay constants, f_pi and f_K, and their ratio using domain wall valence quarks and 2+1 flavors of dynamical staggered quarks. Use of the MILC gauge configurations allows us to simulate at several sea quark masses and spatial volumes, and with two lattice spacings. We study how well our numerical lattice data for light decay constants and meson masses is described by next-to-leading order SU(3) mixed action chiral perturbation theory and explain our strategy for the chiral and continuum extrapolation. Combining our result for f_K/f_pi with experimental measurements of pion and kaon leptonic decays allows a model-independent determination of |V_us|/|V_ud|; we find a preliminary value of |V_us|/|V_ud| = 0.2315(45)(7).

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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