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arXiv 2301.08641hep-ph
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轻子味特定的扩展 Higgs 模型

Lepton Flavor Specific Extended Higgs Model

B. L. Gonçalves, Matthew Knauss, Marc Sher

AI总结:

本文提出一个轻子味特定的四双重态扩展 Higgs 模型,其中一个 Higgs 耦合夸克,另三个分别耦合电子、μ子和 τ 子,在满足各项约束和对齐极限下,发现最轻额外标量可大量衰变为电子和 μ 子。

摘要:

在扩展 Higgs 模型中,夸克部门需要一种离散对称性以避免树级味改变中性流。然而,轻子部门并非必须如此。我们考虑一个模型,其中一个 Higgs 耦合到夸克,另外三个分别耦合到电子、μ子和 τ 子。这个四双重态模型给出了完整的标量势以及规范和 Yukawa 耦合。来自有界性、微扰性和斜参数的约束,以及来自介子-反介子混合、辐射 B 衰变和双光子 Higgs 衰变率的约束也被纳入。我们还考虑了在 LHC 上对重中性和带电标量搜索的限制。由于标准模型 Higgs 耦合与预测非常匹配,我们重点关注该模型的对齐极限。结果表明,在很宽的参数范围内,最轻的额外标量、赝标量和带电标量可以大量衰变为电子和 μ 子(与通常衰变为 τ 子的轻子衰变不同)。中性部门的一个有趣特征是通过矢量玻色子聚变产生一对标量,每个标量衰变为电子或 μ 子对。

英文摘要:

In extended Higgs models, a discrete symmetry is needed in the quark sector to avoid tree-level flavor-changing neutral currents. However, this is not necessary the case in the lepton sector. We consider a model in which one Higgs couples to quarks and three others couple to the electron, muon and tau, respectively. This four-doublet model is presented with the full scalar potential and the gauge and Yukawa couplings. The constraints from boundedness, perturbativity and oblique parameters are incorporated as well as constraints from meson-antimeson mixing, radiative B-decays and the diphoton Higgs decay rate. We also consider bounds from searches for heavy neutral and charged scalars at the LHC. Since the Standard Model Higgs couplings match predictions very well, we focus on the alignment limit of the model. It is shown that for a wide range of parameters, the lightest additional scalar, pseudoscalar and charged scalar can have substantial decays into electrons and muons (in contrast to the usual leptonic decays into taus). An interesting signature in the neutral sector would be the production, through vector boson fusion, of a pair of scalars, each of which decays into an electron or muon pair.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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