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在味对齐双希格斯二重态模型框架中容纳新重标量粒子的迹象

Accommodating Hints of New Heavy Scalars in the Framework of the Flavor-Aligned Two-Higgs-Doublet Model

Joseph M. Connell, Pedro Ferreira, Howard E. Haber

AI总结:

本文提出利用LHC实验数据检验双希格斯二重态模型中味对齐是否源于对称性,并通过ATLAS和CMS的重标量粒子超出事例展示了两种场景,其中一种与软破缺Z2对称性一致,另一种则需要更一般的味对齐耦合。

摘要:

在大型强子对撞机上对扩展希格斯扇区中新的中性希格斯玻色子的搜寻,可以在双希格斯二重态模型的框架内进行解释。通过采用一般的味对齐希格斯-费米子汤川耦合,我们提出了一种分析方法,利用实验数据来确定味对齐是否是一种对称性的结果,该对称性要么是精确的,要么至多被软破缺。我们基于ATLAS和CMS合作组在搜寻重标量粒子时观测到的几个3σ(局部)超出,在两种不同场景中说明了我们的方案。在场景1中,一个事例超出被解释为$A\to ZH\to \ell^+\ell^- b\bar{b}$(其中$\ell=e$或$μ$),CP奇和CP偶中性标量粒子的质量分别为$m_A=610$ GeV和$m_H=290$ GeV。在场景2中,$t\bar{t}$和$τ^+τ^-$末态产生中的事例超出被解释为质量为$m_A=400$ GeV的CP奇标量粒子的衰变。场景1与Type-I汤川相互作用一致,这种相互作用可以在受软破缺$\mathbb{Z}_2$离散对称性约束的2HDM中出现。场景2与基于对称性的味对齐不一致,但可以与更一般的味对齐希格斯-费米子汤川耦合一致。

英文摘要:

Searches for new neutral Higgs bosons of an extended Higgs sector at the LHC can be interpreted in the framework of the two-Higgs doublet model. By employing generic flavor-aligned Higgs-fermion Yukawa couplings, we propose an analysis that uses experimental data to determine whether flavor alignment is a consequence of a symmetry that is either exact or at most softly broken. We illustrate our proposal in two different scenarios based on a few 3 sigma (local) excesses observed by the ATLAS and CMS Collaborations in their searches for heavy scalars. In Scenario 1, an excess of events is interpreted as $A\to ZH\to \ell^+\ell^- b\bar{b}$ (where $\ell=e$ or $μ$), with the CP-odd and CP-even neutral scalar masses given by $m_A=610$ GeV and $m_H=290$ GeV, respectively. In Scenario 2, an excess of events in the production of $t\bar{t}$ and $τ^+τ^-$ final states is interpreted as decays of a CP-odd scalar of mass $m_A=400$ GeV. Scenario 1 is consistent with Type-I Yukawa interactions, which can arise in a 2HDM subject to a softly-broken $\mathbb{Z}_2$ discrete symmetry. Scenario 2 is inconsistent with a symmetry-based flavor alignment, but can be consistent with more general flavor-aligned Higgs-fermion Yukawa couplings.

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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