Approaches to inclusive semileptonic B(s)-meson decays from Lattice QCD
Approaches to inclusive semileptonic B(s)-meson decays from Lattice QCD
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DOI：
10.1007/jhep07(2023)145
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发表时间：
2023-05
影响因子：
5.4
通讯作者：
Alessandro Barone;S. Hashimoto;A. Jüttner;T. Kaneko;R. Kellermann
中科院分区：
文献类型：
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作者：
Alessandro Barone;S. Hashimoto;A. Jüttner;T. Kaneko;R. Kellermann
本文从格点QCD出发，讨论了半轻子B（s）介子衰变的包容衰变率的非微扰计算。精确的标准模型预测是寻找新物理学的关键因素，这种类型的计算最终可能为Cabibbo-Kobayashi-Maskawa（CKM）矩阵元素的包容性和排他性决定之间的长期紧张关系提供新的见解|V CB|和|V ub|.我们给出了对B s→ Xc lν l的初步格点计算结果，其中初始B夸克在格点上用相对论重夸克（RHQ）形式描述，其它价夸克用畴壁费米子离散，近似地模拟在它们的物理夸克质量上.我们比较了两种不同的方法来计算衰减率从格数据的欧几里德n点函数，即切比雪夫和巴克斯吉尔伯特方法。我们进一步研究了基态介子占主导地位的包容性衰变率，并指出我们的战略对计算更全面的系统误差预算。
We address the nonperturbative calculation of the inclusive decay rate of semileptonic B (s)-meson decays from lattice QCD. Precise Standard-Model predictions are key ingredients in searches for new physics, and this type of computation may eventually provide new insight into the long-standing tension between the inclusive and exclusive determinations of the Cabibbo-Kobayashi-Maskawa (CKM) matrix elements| V cb| and| V ub|. We present results from a pilot lattice computation for B s→ X c lν l, where the initial b quark described by the relativistic-heavy-quark (RHQ) formalism on the lattice and the other valence quarks discretised with domain-wall fermions are simulated approximately at their physical quark masses. We compare two different methods for computing the decay rate from lattice data of Euclidean n-point functions, namely Chebyshev and Backus-Gilbert approaches. We further study how much the ground-state meson dominates the inclusive decay rate and indicate our strategy towards a computation with a more comprehensive systematic error budget.