解析MFV-SMEFT中的香味结构
Resolving the Flavor Structure in the MFV-SMEFT
摘要：
我们从数据中约束标准模型有效场论（SMEFT）中Wilson系数的味结构。在SMEFT中，通过Cabibbo-Kobayashi-Maskawa混合矩阵关联了上型和下型夸克耦合中的新物理效应。我们利用这种关系来确定潜在的新来源的味道对称性破缺的高，低能量的数据从大型强子对撞机，LEP，和$b$工厂实验的全球分析。我们证明了这样一个分析的力量，通过执行有效的四夸克和两夸克耦合的组合适合一个大的风味，顶夸克，电弱，和双喷观测。所有四个扇区都需要完全解决四夸克耦合的味道结构，而不会在参数空间中留下盲目的方向。虽然我们在最小味违反的框架下工作，但我们的策略也适用于其他味模式，如$U(2)$味对称或leptoquark场景。
英文摘要：
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 the 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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