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arXiv 2109.01128hep-ph
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LHC范围内新希格斯玻色子的可能指示:N2HDM和NMSSM解释

Possible indications for new Higgs bosons in the reach of the LHC: N2HDM and NMSSM interpretations

Thomas Biekötter, Alexander Grohsjean, Sven Heinemeyer, Christian Schwanenberger, Georg Weiglein

摘要:

在大型强子对撞机对额外的希格斯玻色子的几次搜寻中,特别是在探索顶夸克对衰变的CMS搜寻中,$t \bar t$,以及在研究τ轻子的ATLAS搜寻中,$τ^+τ^-$,在大约$ 400$ GeV的质量尺度上观察到了大约$3\,σ$标准偏差或更高的局部过剩。我们调查在何种程度上可能的信号在这些通道中可以容纳在下一个到两个希格斯双重模型(N2 HDM)或下一个到最小超对称标准模型(NMSSM)。在第二步中,我们分析这样的模型是否可以兼容的信号在周围的$400$ GeV和$96$ GeV,后者的可能性是由观察到的过度搜索的$b \bar b$最终状态在LEP和CMS的双光子最终状态的动机。对N2 HDM的分析表明,在$t \bar t$和$τ^+τ^-$通道中观测到的$400GeV$处的过剩指向参数空间的不同区域,而一个这样的过剩和一个额外的Higgs玻色子在$96$ GeV附近可以同时被容纳。在NMSSM的背景下,实验证实$t \bar t$末态的信号将有利于模型的无退耦限制,其中$125$ GeV的希格斯玻色子与标准模型的希格斯玻色子基本上无法区分。相比之下,$τ^+τ^-$通道中的信号只能容纳在这个限制之外,并且部分研究的参数空间可以在(HL-)LHC上用希格斯信号速率测量来探测。

英文摘要:

In several searches for additional Higgs bosons at the LHC, in particular in a CMS search exploring decays to pairs of top quarks, $t \bar t$, and in an ATLAS search studying tau leptons, $τ^+τ^-$, local excesses of about $3\,σ$ standard deviations or above have been observed at a mass scale of approximately $ 400$GeV. We investigate to what extent a possible signal in these channels could be accommodated in the Next-to-Two-Higgs-Doublet Model (N2HDM) or the Next-to Minimal Supersymmetric Standard Model (NMSSM). In a second step we analyze whether such a model could be compatible with both a signal at around $400$GeV and $96$GeV, where the latter possibility is motivated by observed excesses in searches for the $b \bar b$ final state at LEP and the di-photon final state at CMS. The analysis for the N2HDM reveals that the observed excesses at $400GeV$ in the $t \bar t$ and $τ^+τ^-$ channels point towards different regions of the parameter space, while one such excess and an additional Higgs boson at around $96$GeV could simultaneously be accommodated. In the context of the NMSSM an experimental confirmation of a signal in the $t \bar t$ final state would favour the alignment-without-decoupling limit of the model, where the Higgs boson at $125$GeV could be essentially indistinguishable from the Higgs boson of the standard model. In contrast, a signal in the $τ^+τ^-$ channel can only be accommodated outside of this limit, and parts of the investigated parameter space could be probed with Higgs signal-rate measurements at the (HL-)LHC.

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