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arXiv 2009.12970hep-ph
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LHC Higgs耦合测量对scNMSSM中性Higgs扇区玻色子衰变的影响

Impact of LHC Higgs couplings measurements on bosonic decays of the neutral Higgs sector in the scNMSSM

Marwa Telba, Maien Binjonaid

摘要:

我们在当前的理论和实验约束下分析了具有大统一边界条件的次最小超对称标准模型。我们计算模型的质谱,并专注于三个最轻的粒子在希格斯扇区(两个CP偶标量,$h_1, h_2$,和一个CP奇,$a_1$)。这种粒子的减少耦合,单线态-二重态组件,它们的分支比玻色子,并减少通过胶子融合的光子和大质量规范玻色子的横截面进行了彻底和系统的审查。我们的分析是集中在参数空间的单重态-二重态耦合$λ$是尽可能大的(保持微扰约束不变)和真空之间的比例的期望值的向上型和向下型希格斯粒子($\tanβ$)是尽可能小的,这是代表最自然的情况下的NMSSM的区域。我们展示了最近LHC对SM-希格斯玻色子和费米子耦合模型的参数空间的约束的影响,以及由此产生的对希格斯扇区的影响。结果表明,虽然该模型仍然能够解释当前的数据,并提供了一个机会,发现扩展的希格斯扇区,最近的大型强子对撞机希格斯耦合约束排除了部分参数空间,其中$h_2$(非SM样)和$a_1$是非单线态的质量低于~400 GeV。

英文摘要:

We analyze the Next-to-minimal supersymmetric standard model with Grand unification boundary conditions under current theoretical and experimental constraints. We compute the mass spectrum of the model and focus on the three lightest particles in the Higgs sector (two CP-even scalars, $h_1, h_2$, and one CP-odd, $a_1$). The reduced couplings of such particles, singlet-doublet components, their branching ratios to bosons, and reduced cross-section to photons and massive gauge bosons via gluon fusion are thoroughly and systematically scrutinized. Our analysis is focused on the parameter space where the singlet-doublet coupling $λ$ is as large as possible (keeping the perturbativity bound intact) and the ratio between the vacuum expectation values of the up-type and down-type Higgses ($\tanβ$) is as small as possible, which is the region representing the most natural case of the NMSSM. We show the impact of recent constraints from the LHC on the SM-Higgs couplings to bosons and fermions on the parameter space of the model and the consequent implications on the Higgs sector. The results show that while the model is still able to account for current data and provide an opportunity for discovery of extended Higgs sectors, recent LHC Higgs couplings constraints rule-out parts of the parameter space where $h_2$ (non-SM-like) and $a_1$ are non-singlet with masses below ~400 GeV.

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