Next-to-leading order corrections to decays of the heavier CP-even Higgs boson in the two Higgs doublet model
Next-to-leading order corrections to decays of the heavier CP-even Higgs boson in the two Higgs doublet model
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DOI：
10.1016/j.nuclphysb.2022.115906
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发表时间：
2022-03
影响因子：
2.8
通讯作者：
S. Kanemura;Mariko Kikuchi;K. Yagyu
中科院分区：
文献类型：
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作者：
S. Kanemura;Mariko Kikuchi;K. Yagyu
我们研究了电弱（EW）、标量和QCD修正对具有z2对称性软破缺的两个希格斯双重态模型中一个额外的cp -偶数希格斯玻色子(H)的全套衰变分支比的影响。我们在重归一化的顶点上采用了改进的规范无关的壳上格式。我们特别关注接近对准极限的情况，在这种情况下，发现的125 GeV希格斯玻色子(h)的耦合与标准模型的耦合一致，而Hhh耦合在树水平上消失。由于额外的希格斯玻色子的非解耦环路效应，即使在接近对齐的情况下，H→H H的重整化衰变率也可以从树水平的预测显著改变。我们发现，在微扰统一性、真空稳定性和电子束精度数据约束下，当附加希格斯玻色子的质量被简并时，对H→H分支比的辐射修正可以达到几个百分之十的水平。在额外的希格斯玻色子之间存在质量差异的情况下，可以得到进一步的相当大的修正。
We investigate the impact of electroweak (EW), scalar and QCD corrections to the full set of decay branching ratios of an additional CP-even Higgs boson (H) in the two Higgs doublet model with a softly broken Z 2 symmetry. We employ the improved gauge independent on-shell scheme in the renormalized vertices. We particularly focus on the scenario near the alignment limit in which couplings of the discovered 125 GeV Higgs boson (h) coincide with those of the standard model while the Hhh coupling vanishes at tree level. The renormalized decay rate for H→ h h can significantly be changed from the prediction at tree level due to non-decoupling loop effects of additional Higgs bosons, even in the near alignment case. We find that the radiative corrections to the branching ratio of H→ h h can be a few ten percent level in the case with the masses of additional Higgs bosons being degenerate under the constraints of perturbative unitarity, vacuum stability and the EW precision data. Further sizable corrections can be obtained for the case with a mass difference among the additional Higgs bosons.