Resolving the flavor structure in the MFV-SMEFT

Resolving the flavor structure in the MFV-SMEFT
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解析 MFV-SMEFT 中的风味结构

DOI:
10.1007/jhep02(2023)225
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发表时间:
2023
期刊:
JHEP
影响因子:
--
通讯作者:
Bruggisser Sebastian
Bruggisser Sebastian
中科院分区:
--
文献类型:
--
作者:
Bruggisser Sebastian

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我们从数据中约束标准模型有效场论 (SMEFT) 中威尔逊系数的风味结构。在 SMEFT 中,上型夸克和下型夸克耦合中的新物理效应通过 Cabibbo-Kobayashi-Maskawa 混合矩阵关联起来。我们利用这种关系,在对 LHC、LEP 和 b 工厂实验的高能和低能数据进行全局分析时,确定风味对称性破坏的潜在新来源。我们通过对有效的四夸克和二夸克耦合进行组合拟合来证明这种分析的威力,这些耦合有助于产生大量的风味、顶夸克、电弱和双杰可观测量。需要所有四个扇区才能完全解析左手性四夸克耦合的风味结构,而不在参数空间中留下盲方向。尽管我们在最小风味违规的框架下工作,但我们的策略也适用于其他风味模式,例如 U (2) 风味对称或轻夸克场景。
We constrain the flavor structure of Wilson coefficients in the Standard Model Effective Field Theory (SMEFT) from data. In the SMEFT, new physics effects in couplings of up-type and down-type quarks are related through the Cabibbo-Kobayashi-Maskawa mixing matrix. We exploit this relation to pin down potential new sources of flavor symmetry breaking in a global analysis of high-and low-energy data from the LHC, LEP, and b factory experiments. We demonstrate the power of such an analysis by performing a combined fit of effective four-quark and two-quark couplings contributing to a large set of flavor, top-quark, electroweak, and dijet observables. All four sectors are needed to fully resolve the flavor structure of left-chiral four-quark couplings without leaving blind directions in the parameter space. Although we work in the framework of minimal flavor violation, our strategy applies as well to other flavor patterns, like U (2) flavor symmetry or leptoquark scenarios.
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