论文标题
标准模型有效现场理论的平方四边形操作员对介子混合的影响
Effects of squared four-fermion operators of the Standard Model Effective Field Theory on meson mixing
论文作者
论文摘要
标准模型有效场理论（SMEFT）是一种参数化新物理（NP）的通用方法，该物理学（NP）与标准模型（SM）自由度相互作用，尊重SM的对称性。 NP相互作用中的高阶项可能会导致相当大的影响，这是有意义的现象学研究的强制性，例如对中性介子混合的贡献，这通常会将NP的尺度推向能量量表，这超出了相似者直接搜索的范围。我讨论了尺寸6尺寸的双插入的领先重新归一化，这些尺寸为6四效操作员通过一个单位（即$ | |Δf| = 1 $，$ f = $ f = $ f = $ f = $ f = $ f = $ f = $ f = $ tramey-，hamm-thos toblavor），dimension-8运算符与梅森混合（即$ | exf |δf|δf| euf = 2 $），然后，我考虑与大野瓦人成比例的贡献的现象学意义，通过领先的对数贡献对Dimension-6运营商的Wilson系数设定了界限。鉴于SMEFT对低能量编码成熟模型的根本兴趣，这项工作强调了在SMEFT的Dimension-6操作员的现象学应用中考虑Dimension-8操作员的需求。
The Standard Model Effective Field Theory (SMEFT) is a universal way of parametrizing New Physics (NP) manifesting as new, heavy particle interactions with the Standard Model (SM) degrees of freedom, that respect the SM gauged symmetries. Higher order terms in the NP interactions possibly lead to sizable effects, mandatory for meaningful phenomenological studies, such as contributions to neutral meson mixing, which typically pushes the scale of NP to energy scales much beyond the reach of direct searches in colliders. I discuss the leading-order renormalization of double-insertions of dimension-6 four-fermion operators that change quark flavor by one unit (i.e., $ | ΔF | = 1 $, $ F = $ strange-, charm-, or bottom-flavor), by dimension-8 operators relevant to meson mixing (i.e., $ | ΔF | = 2 $) in SMEFT. Then, I consider the phenomenological implications of contributions proportional to large Yukawas, setting bounds on the Wilson coefficients of operators of dimension-6 via the leading logarithmic contributions. Given the underlying interest of SMEFT to encode full-fledged models at low energies, this work stresses the need to consider dimension-8 operators in phenomenological applications of dimension-6 operators of SMEFT.
