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arXiv 2104.08146hep-ph
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具有$Z_3$对称性的三重Higgs模型中轻荷标量的前景

Prospects of light charged scalars in a three Higgs doublet model with $Z_3$ symmetry

Manimala Chakraborti, Dipankar Das, Miguel Levy, Samadrita Mukherjee, Ipsita Saha

摘要:

在LHC上直接搜索奇异标量的严格约束以及来自味道物理测量的间接边界对具有扩展希格斯扇区的新物理模型的参数空间施加了严格的限制。在II型2HDM中,这意味着带电希格斯粒子的质量下限为$\cal O$(600 GeV)。在这项工作中,我们分析了现象学的Z3HDM的对齐限制,侧重于口味的物理约束对其参数空间的影响。我们表明,在这个模型中的两个带电的希格斯玻色子的耦合功能相比,II型2HDM的一个额外的抑制因子。这导致了一个显着放松的味道物理约束在这个模型中,允许带电的希格斯质量低至$\cal O$(200 GeV)。我们还考虑了来自精密电弱观测和观测到的双光子衰变率的125 GeV的希格斯玻色子在大型强子对撞机的约束。在大型强子对撞机上直接搜索非标准希格斯玻色子玻色子得到的边界,特别是在ditau通道中共振搜索得到的边界,被证明对进一步限制这种情况非常有效。

英文摘要:

The stringent constraints from the direct searches for exotic scalars at the LHC as well as indirect bounds from flavor physics measurements have imposed severe restrictions on the parameter space of new physics models featuring extended Higgs sectors. In the Type-II 2HDM, this implies a lower bound on the charged Higgs masses of $\cal O$(600 GeV). In this work we analyze the phenomenology of a Z3HDM in the alignment limit focusing on the impact of flavor physics constraints on its parameter space. We show that the couplings of the two charged Higgs bosons in this model feature an additional suppression factor compared to Type-II 2HDM. This gives rise to a significant relaxation of the flavor physics constraints in this model, allowing the charged Higgs masses to be as low as $\cal O$(200 GeV). We also consider the constraints coming from precision electroweak observables and the observed diphoton decay rate of the 125 GeV Higgs boson at the LHC. The bounds coming from the direct searches of nonstandard Higgs bosons at the LHC, particularly those from resonance searches in the ditau channel, prove to be very effective in constraining this scenario further.

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