论文标题
单位性和分析性的风味限制
Flavor Constraints from Unitarity and Analyticity
论文作者
论文摘要
我们使用散射幅度的单位性和分析性来限制标准模型有效现场理论中的费米子操作员。对于质量尺寸8处的四个特里米昂操作员，我们将风味叠加散布在固定标准模型表示中，并发现威尔逊系数受到约束，以使其与任何一对纯密度矩阵的收缩是正面的。这些约束意味着风味竞争是由其持有风味的表兄弟所限制的。例如，LEP数据似乎已经排除了某些运算符，以$ \至3E $测量。
We use unitarity and analyticity of scattering amplitudes to constrain fermionic operators in the standard model effective field theory. For four-fermion operators at mass dimension 8, we scatter flavor superpositions in fixed standard model representations and find the Wilson coefficients to be constrained so that their contraction with any pair of pure density matrices is positive. These constraints imply that flavor-violating couplings are upper-bounded by their flavor-conserving cousins. For instance, LEP data already appears to preclude certain operators in upcoming $μ\to 3e$ measurements.
