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arXiv 2502.04579hep-ph
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代际三希格斯二重态模型中的味约束

Flavor Constraints in a Generational Three Higgs Doublet Model

Wolfgang Altmannshofer, Kevin Toner

AI总结:

本研究提出一种代际三希格斯二重态模型,通过非标准汤川耦合与代际真空期望值层级解释味疑难,在对齐极限下得到类标准模型希格斯,结合味物理约束下新希格斯可轻至1 TeV以下。

摘要:

我们提出了一种超越自然味守恒的三希格斯二重态模型(3HDM,Three Higgs Doublet Model),其中三个希格斯二重态各自通过非标准汤川结构主要与单代费米子耦合。三个希格斯二重态真空期望值的层级结构可部分解释标准模型(SM)的味疑难。结合实验观测到的125 GeV希格斯玻色子,我们主要在3HDM对齐极限下开展研究,以得到类标准模型希格斯粒子。为重现观测到的夸克CKM混合,该理论的中性希格斯玻色子必然在树图水平介导味改变中性流。我们考虑了中性K介子、B介子、D介子混合以及稀有轻子衰变$B_s/B^0/K_L\rightarrowμ^+μ^-/e^+e^-$带来的约束,确定了新物理希格斯玻色子质量可低至1 TeV甚至更轻的参数空间区域。

英文摘要:

We propose a Three Higgs Doublet Model (3HDM) that goes beyond natural flavor conservation and in which each of the three Higgs doublets couples mainly to a single generation of fermions via non-standard Yukawa structures. A hierarchy in the vacuum expectation values of the three Higgs doublets can partially address the SM flavor puzzle. In light of the experimentally observed $125$ GeV Higgs boson, we primarily work within a 3HDM alignment limit such that a Standard Model-like Higgs is recovered. In order to reproduce the observed CKM mixing among quarks, the neutral Higgs bosons of the theory necessarily mediate flavor changing neutral currents at the tree level. We consider constraints from neutral kaon, $B$ meson, and $D$ meson mixing as well as from the rare leptonic decays $B_s/B^0/K_L\rightarrowμ^+μ^-/e^+e^-$. We identify regions of parameter space in which the new physics Higgs bosons can be as light as a TeV or even lighter.

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