The flavor of UV physics

The flavor of UV physics
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紫外线物理的味道

DOI:
10.1007/jhep05(2021)257
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发表时间:
2021
影响因子:
5.4
通讯作者:
S. Westhoff
S. Westhoff
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
S. Bruggisser;R. Schäfer;D. van Dyk;S. Westhoff

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新的物理学在TeV尺度上不远处,应该会在较低能量的观测中留下一种虚效应的模式。关于紫外线理论的味道结构,这些效应告诉了我们什么?在标准模型有效场论(SMEFT)的框架下,我们在顶夸克和B物理观测量的联合分析中解决了Wilson系数的味结构。我们假设汤川耦合是味对称破缺的唯一来源,这一框架被称为最小味破坏。我们对LHC和B工厂测量的拟合表明,结合顶部和底部的可观测量对于确定紫外线理论中味道破坏的可能来源至关重要。该分析包括最小味破坏中SMEFT系数的完全解析展开和B → s味转变中SMEFT效应的详细研究。
New physics not far above the TeV scale should leave a pattern of virtual effects in observables at lower energies. What do these effects tell us about the flavor structure of a UV theory? Within the framework of the Standard Model Effective Field Theory (SMEFT), we resolve the flavor structure of the Wilson coefficients in a combined analysis of top-quark and B-physics observables. We assume that the Yukawa couplings are the only sources of flavor symmetry breaking, a framework known as Minimal Flavor Violation. Our fits to LHC and b-factory measurements show that combining top and bottom observables is crucial to pin down possible sources of flavor breaking in a UV theory. This analysis includes the full analytic expansion of SMEFT coefficients in Minimal Flavor Violation and a detailed study of SMEFT effects in b → s flavor transitions.
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