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Constraints on the parameter space in an inert doublet model with two active doublets
Journal of High Energy Physics ( IF 5.4 ) Pub Date : 2020-03-01 , DOI: 10.1007/jhep03(2020)108
Marco Merchand , Marc Sher

We study a three Higgs doublet model where one doublet is inert and the other two doublets are active. Flavor changing neutral currents are avoided at tree-level by imposing a softly broken Z 2 ′ $$ {Z}_2^{\prime } $$ symmetry and we consider type I and type II Yukawa structures. The lightest inert scalar is a viable Dark Matter (DM) candidate. A numerical scan of the free parameters is performed taking into account theoretical constraints such as positivity of the scalar potential and unitarity of 2 → 2 scattering amplitudes. The model is further constrained by experimental results such as B physics lower limits on charged Higgs masses, Electroweak Precision Observables, LEP II, LHC Higgs measurements, Planck measurement of the DM relic abundance and WIMP direct searches by the LUX and XENON1T experiments. The model predictions for mono-jet, mono Z and mono Higgs final states are studied and tested against current LHC data and we find the model to be allowed. We also discuss the effects of abandoning the “dark democracy” assumption common in studies of inert models. Projected sensitivities of direct detection experiments will leave only a tiny window in the DM mass versus coupling plane that is compliant with relic density bounds.

中文翻译:

具有两个活性双峰的惰性双峰模型中参数空间的约束

我们研究了一个三希格斯双峰模型,其中一个双峰是惰性的,另外两个双峰是活跃的。通过施加一个软破坏的 Z 2 ′ $$ {Z}_2^{\prime } $$ 对称性,在树级避免了风味变化的中性电流,我们考虑了 I 型和 II 型汤川结构。最轻的惰性标量是可行的暗物质 (DM) 候选者。考虑到理论约束,例如标量势的正性和 2 → 2 散射幅度的单一性,对自由参数进行数值扫描。该模型还受到实验结果的限制,例如带电希格斯质量的 B 物理学下限、电弱精确可观测值、LEP II、LHC 希格斯测量、DM 遗迹丰度的普朗克测量以及 LUX 和 XENON1T 实验的 WIMP 直接搜索。单喷气机的模型预测,单声道 Z 和单声道希格斯最终状态针对当前的 LHC 数据进行了研究和测试,我们发现该模型是允许的。我们还讨论了放弃惰性模型研究中常见的“黑暗民主”假设的影响。直接检测实验的预计灵敏度将仅在 DM 质量与耦合平面中留下一个符合遗物密度界限的微小窗口。
更新日期:2020-03-01
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