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arXiv 2002.01000hep-ph
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Higgs Dimuon衰变的抑制

Suppression of the Higgs Dimuon Decay

P. M. Ferreira, Marc Sher

摘要:

人们经常说,在多希格斯玻色子模型中消除树级的变味中性流需要给定电荷的所有费米子耦合到相同的希格斯玻色子。Abe、Sato和Yagyu在一个具有软破缺$Z_4$对称性的μ子特异性双希格斯偶线模型中提供了一个反例。在这个模型中,除了μ子之外的所有费米子都耦合到一个希格斯玻色子,而μ子则耦合到另一个希格斯玻色子。我们研究的模型的现象学,并表明,有一个广泛的参数空间中的分支比的125 GeV的希格斯粒子是非常接近他们的标准模型值,除了分支比到μ子,这可以大大抑制-这是一个有趣的可能性,因为这个分支比的当前值是$0.5 \pm 0.7$倍的标准模型值。我们还研究了带电的希格斯玻色子,并表明,如果它比$200$ GeV轻,它可能有一个大的分支比成$μν$ -甚至远远大于通常衰变成$τν$。本文还研究了重中性标量的衰变。该模型确实存在125 GeV希格斯粒子到$Z$、$τ$和$μ$的分支比之间的关系,可以在未来的加速器中进行测试。

英文摘要:

It is often stated that elimination of tree-level flavor-changing neutral currents in multi-Higgs models requires that all fermions of a given charge to couple to the same Higgs boson. A counterexample was provided by Abe, Sato and Yagyu in a muon-specific two-Higgs doublet model with a softly-broken $Z_4$ symmetry. In this model, all fermions except the muon couple to one Higgs and the muon couples to the other. We study the phenomenology of the model and show that there is a wide range of parameter-space in which the branching ratios of the 125 GeV Higgs are very close to their Standard Model values, with the exception of the branching ratio into muons, which can be substantially suppressed -- this is an interesting possibility, since the current value of this branching ratio is $0.5 \pm 0.7$ times the Standard Model value. We also study the charged Higgs boson and show that, if it is lighter than $200$ GeV, it could have a large branching ratio into $μν$ - even substantially larger than the usual decay into $τν$. The decays of the heavy neutral scalars are also studied. The model does have a relationship between the branching ratios of the 125 GeV Higgs into $Z$'s, $τ$'s and $μ$'s, which can be tested in future accelerators.

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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