Type-I 2HDM under the Higgs and electroweak precision measurements
Type-I 2HDM under the Higgs and electroweak precision measurements
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DOI：
10.1007/jhep08(2020)131
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发表时间：
2019-12
影响因子：
5.4
通讯作者：
N. Chen;T. Han;Shuailong Li;S. Su;W. Su;Yongcheng Wu
中科院分区：
文献类型：
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作者：
N. Chen;T. Han;Shuailong Li;S. Su;W. Su;Yongcheng Wu
我们通过研究i型双希格斯双重态模型（Type-I 2HDM）来说明，探索在拟议的z工厂和希格斯工厂对标准模型（SM）观测结果的未来精确测量可能对标准模型之外的新物理产生的影响程度。我们在一个完整的模型参数空间中包括了重希格斯玻色子在树水平和单环水平上的贡献。虽然只有小的tan β区域在树水平上受到强烈约束，但由于tan β增强了三希格斯耦合，大的tan β区域在环路水平上受到约束。我们对非对准和非简并质量进行多变量χ 2拟合。我们发现允许的参数范围可能会受到未来希格斯精度测量的严格限制，特别是对于tan β的大小值。可以获得重希格斯玻色子质量的间接限制，这可以补充在强子对撞机上直接搜索重希格斯玻色子。我们还发现，在z极和希格斯工厂的预期精度在约束重希格斯玻色子的质量分裂方面是相当互补的。典型结果为| cos (β−α)|< 0。5,|∆m Φ|< 200gev, tan β < 0。3. 对CEPC、Fcc-ee和ILC的希格斯和z极精度测量结果进行了比较。与ii型2HDM相比，cos （β - α）的95% CL允许范围更大，特别是对于大的tan β值。
We explore the extent to which future precision measurements of the Standard Model (SM) observables at the proposed Z-factories and Higgs factories may have impacts on new physics beyond the Standard Model, as illustrated by studying the Type-I Two-Higgs-doublet model (Type-I 2HDM). We include the contributions from the heavy Higgs bosons at the tree-level and at the one-loop level in a full model-parameter space. While only small tan β region is strongly constrained at tree level, the large tan β region gets constrained at loop level due to tan β enhanced tri-Higgs couplings. We perform a multiple variable χ 2 fit with non-alignment and non-degenerate masses. We find that the allowed parameter ranges could be tightly constrained by the future Higgs precision measurements, especially for small and large values of tan β. Indirect limits on the masses of heavy Higgs bosons can be obtained, which can be complementary to the direct searches of the heavy Higgs bosons at hadron colliders. We also find that the expected accuracies at the Z-pole and at a Higgs factory are quite complementary in constraining mass splittings of heavy Higgs bosons. The typical results are| cos (β− α)|< 0. 05,|∆ m Φ|< 200 GeV, and tan β≳ 0. 3. The reaches from CEPC, Fcc-ee and ILC are also compared, for both Higgs and Z-pole precision measurements. Comparing to the Type-II 2HDM, the 95% CL allowed range of cos (β− α) is larger, especially for large values of tan β.