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arXiv 2312.00514hep-ph
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对齐双希格斯二重态模型(Aligned Two-Higgs-Doublet Model)的全局拟合

Global fit of the Aligned Two-Higgs-Doublet Model

Anirban Karan, Víctor Miralles, Antonio Pich

AI总结:

本文利用HEPfit对对齐双希格斯二重态模型进行贝叶斯全局拟合,综合真空稳定性、微扰性、味与电弱精确数据及LHC希格斯搜寻约束。

摘要:

尽管标准模型(SM)对基本粒子之间的相互作用给出了非常优雅的描述,但仍有大量证据表明需要新物理。特别是,从真空稳定性、电弱相变以及其他各种方面来看,扩展标量部分具有充分动机。在此类不同扩展中,双希格斯二重态模型(THDM)是保持电弱ρ参数的最简单模型。味改变中性流(FCNC)通常通过引入额外的离散对称性来避免,但这类模型受到严格的唯象学约束。在更一般的对齐THDM(ATHDM)框架中,通过使两个标量二重态的Yukawa耦合具有相同的味结构,可以避免树图阶FCNC,从而使唯象学约束更弱。在此,我们提出ATHDM的全局拟合,使用HEPfit程序包,借助稳定性和微扰性界限、各种味与电弱精确可观测量的实验数据,以及LHC上希格斯搜寻的约束,对该模型的参数空间进行贝叶斯分析。该全局拟合假设所有额外标量都比SM希格斯粒子更重,并且除CKM相位外不存在额外的CP破坏源。

英文摘要:

Though the Standard Model (SM) provides a very elegant description of the interactions among fundamental particles, there are ample evidences suggesting that new physics is needed. In particular, extending the scalar sector has enough motivation from vacuum stability, electroweak phase transition and various other sectors. Among different such extensions, the two-Higgs-doublet model (THDM) is the simplest one that preserves the electroweak $ρ$ parameter. Flavour-changing neutral currents (FCNC) are usually avoided by implementing additional discrete symmetries, but this type of models are subject to severe phenomenological constraints. In the more general framework of the aligned THDM (ATHDM) tree-level FCNCs are avoided by choosing the same flavour structure for the Yukawa couplings of the two scalar doublets, which results in weaker phenomenological constraints. Here, we present a global fit of the ATHDM, using the package HEPfit that performs a bayesian analysis on the parameter-space of this model with the help of stability and perturbativity bounds, experimental data for various flavour and electroweak precision observables, and constraints from Higgs searches at the LHC. This global fit has been performed assuming that all additional scalars are heavier than the SM Higgs and that there are no extra sources of CP violation beyond the CKM phase.

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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