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arXiv 1604.04822hep-ph
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质量为$750$ GeV的希格斯-黄子是否在LHC13被探测到?

Has a Higgs-flavon with a $750$ GeV mass been detected at the LHC13?

A. Bolaños, J. L. Diaz-Cruz, G. Hernández-Tomé, G. Tavares-Velasco

摘要:

Higgs-flavon场是Froggatt-Nielsen(FN)机制的一部分,它试图解释汤川耦合的层次结构。我们探讨的可能性,750 GeV的双光子共振最近报道的LHC 13,可以确定与低尺度希格斯-flavon场$H_F$,并发现该区域的参数空间与CMS和ATLAS数据一致。结果发现,额外的矢量类费米子的紫外完成的FN机制是必要的,以重现所观察到的信号。我们考虑一个标准模型(SM)的扩展,其中包含两个希格斯双重态(一个标准的和一个惰性的)和一个复杂的FN单线态。惰性双重态包括一个稳定的中性玻色子,这提供了一个可行的暗物质的候选者,而混合的标准双重态和FN单线态诱导味道违反希格斯部门在树水平。对模型参数的约束来自LHC Higgs数据,其中包括寻找轻子味违反SM希格斯玻色子$h\to \barμτ$衰变。在参数空间的某些区域,该模型可能会导致$H_F \to hh$衰变产生0.1量级的大分支比,这可以在LHC上找到。

英文摘要:

Higgs-flavon fields appear as a part of the Froggatt-Nielsen (FN) mechanism, which attempts to explain the hierarchy of Yukawa couplings. We explore the possibility that the 750 GeV diphoton resonance recently reported at the LHC13, could be identified with a low-scale Higgs-flavon field $H_F$ and find the region of the parameter space consistent with CMS and ATLAS data. It is found that the extra vector-like fermions of the ultraviolet completion of the FN mechanism are necessary in order to reproduce the observed signal. We consider a standard model (SM) extension that contains two Higgs doublets (a standard one and an inert one) and one complex FN singlet. The inert doublet includes a stable neutral boson, which provides a viable dark matter candidate, while the mixing of the standard doublet and the FN singlet induces flavor violation in the Higgs sector at the tree-level. Constraints on the parameters of the model are derived from the LHC Higgs data, which include the search for the lepton flavor violating decay of the SM Higgs boson $h\to \barμτ$. It is also found that in some region of the parameter space the model may give rise to a large branching ratio for the $H_F \to hh$ decay, of the order of 0.1, which could be searched for at the LHC.

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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