arXiv 2211.166012022-11-29hep-lat

用蒸馏法研究畴壁费米子在物理点的$Kπ$散射

Towards $Kπ$ scattering with domain-wall fermions at the physical point using distillation

Nelson Pitanga Lachini, Peter Boyle, Felix Erben, Michael Marshall, Antonin Portelli

备注：: arXiv admin note: substantial text overlap with arXiv:2112.09804

摘要：

共振在标准模型唯象学中起着重要的作用。特别是，强子共振在$B$和$D$衰变中起作用，这可能是新物理学搜索的核心。格点量子色动力学模拟结合有限体积方法，现在可以用来可靠地研究强耦合散射过程，如$Kπ$，从而强子共振$K^*$。在这项工作中，我们接近$Kπ$散射畴壁$N_f = 2+1$ RBC-UKQCD系综在物理π质量。我们使用网格和强子软件中的蒸馏方法来计算算子基集。这允许解决本征值问题以提取低能有限体积光谱，然后将其转换为散射信息。我们更新的计算状态，审查涂抹过程中，概述了变分分析，并得出结论，显示初步数据。

英文摘要：

Resonances play an important role in Standard Model phenomenology. In particular, hadronic resonances feature in $B$ and $D$ decays, which can be central for New Physics searches. Lattice QCD simulations combined with the finite-volume method can nowadays be used to reliably study strongly coupled scattering processes such as $Kπ$ and thus the hadronic resonance $K^*$. In this work, we approach $Kπ$ scattering on a domain-wall $N_f = 2+1$ RBC-UKQCD ensemble at a physical pion mass. We use the distillation method within Grid and Hadrons software to compute sets of operator basis. That allows solving an eigenvalue problem to extract the low-energy finite-volume spectra, which are then translated into scattering information. We update the state of the calculation by reviewing the smearing process, outlining the variational analysis and concluding by showing preliminary data.

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