Probing extended Higgs sectors by the synergy between direct searches at the LHC and precision tests at future lepton colliders
Probing extended Higgs sectors by the synergy between direct searches at the LHC and precision tests at future lepton colliders
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DOI：
10.1016/j.nuclphysb.2021.115375
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发表时间：
2020-10
影响因子：
2.8
通讯作者：
Masashi Aiko;S. Kanemura;Mariko Kikuchi;K. Mawatari;K. Sakurai;K. Yagyu
中科院分区：
文献类型：
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作者：
Masashi Aiko;S. Kanemura;Mariko Kikuchi;K. Mawatari;K. Sakurai;K. Yagyu
通过考虑在大型强子对撞机上直接搜索额外的希格斯玻色子与在未来的电子-正电子对撞机（如国际线性对撞机）上对希格斯玻色子特性的光度升级操作和精确测量之间的协同作用，我们讨论了一种可能性，即两个希格斯双重态模型的参数空间显着缩小。我们表明，在发现的希格斯玻色子的耦合常数与标准模型中的预测值略有不同的情况下，大多数参数空间都是通过直接搜索额外的希格斯玻色子来探索的，特别是额外的希格斯玻色子向发现的希格斯玻色子的衰变，以及通过微扰统一性和真空稳定性等理论参数。这是可以做到的，因为只要希格斯玻色子耦合存在偏差，额外的希格斯玻色子的质量就会出现上限。我们还表明，在所有希格斯玻色子耦合都采用标准模型值的对准极限中，大多数参数空间不能被排除，因为大多数希格斯到希格斯的衰变都被抑制了，而且从理论论证来看，质量没有上限。
We discuss a possibility that the parameter space of the two Higgs doublet model is significantly narrowed down by considering the synergy between direct searches for additional Higgs bosons at the LHC and its luminosity upgraded operation and precision measurements of the Higgs boson properties at future electron-positron colliders such as the International Linear Collider. We show that, in the case where the coupling constants of the discovered Higgs boson are slightly different from the predicted values in the standard model, most of the parameter space is explored by the direct searches of extra Higgs bosons, in particular for the decays of the extra Higgs bosons into the discovered Higgs boson, and also by the theoretical arguments such as perturbative unitarity and vacuum stability. This can be done because there appears an upper limit on the mass of the extra Higgs bosons as long as the deviation exists in the Higgs boson coupling. We also show that in the alignment limit where all the Higgs boson couplings take the standard model like values most of the parameter space cannot be excluded because most of the Higgs to Higgs decays are suppressed and also there is no upper limit on the masses from the theoretical arguments.