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arXiv 2301.09229hep-lat
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具有高度改进的交错夸克的$B$ -介子半轻子衰变

$B$-meson semileptonic decays with highly improved staggered quarks

Andrew Lytle, Carleton DeTar, Aida El-Khadra, Elvira Gámiz, Steven Gottlieb, William Jay, Andreas Kronfeld, James Simone, Alejandro Vaquero

摘要:

我们提出了一个更新的费米实验室晶格和MILC合作计划,计算半轻子$B_{(s)}$介子衰变的形状因子。我们的计算使用了高度改进的交错夸克(HISQ)的作用量的海和价夸克,并合奏与上,下,奇怪,和魅力夸克在海中。使用MILC协作的规范系综的高度改进的作用量,使晶格间距降至$a\approx0.03$ fm,允许重价夸克与轻夸克和奇异夸克一样被离散化。价夸克的这种统一处理允许绝对归一化的矢量电流,绕过微扰匹配的需要,这一直是我们合作的$B$ -介子衰变形状因子的先前计算中的不确定性的来源。所有初步形状因子结果均设盲。

英文摘要:

We present an update of the Fermilab Lattice and MILC Collaborations project to compute the form factors for semileptonic $B_{(s)}$-meson decays. Our calculation uses the highly improved staggered quark (HISQ) action for sea and valence quarks, and ensembles with up, down, strange, and charm quarks in the sea. Using a highly improved action with the MILC Collaboration's gauge ensembles with lattice spacings down to $a\approx0.03$ fm, allows the heavy valence quarks to be treated with the same discretization as the light and strange quarks. This unified treatment of the valence quarks allows for absolutely normalized vector currents, bypassing the need for perturbative matching, which has been a source of uncertainty in previous calculations of $B$-meson decay form factors by our collaboration. All preliminary form-factor results are blinded.

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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