Please use this identifier to cite or link to this item: https://hdl.handle.net/2440/128525
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Type: Journal article
Title: Type-I 2HDM under the Higgs and electroweak precision measurements
Author: Chen, N.
Han, T.
Li, S.
Su, S.
Su, W.
Wu, Y.
Citation: The Journal of High Energy Physics, 2020; 2020(8):131-[i]-131-30
Publisher: Springer Nature
Issue Date: 2020
ISSN: 1126-6708
1029-8479
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Responsibility: 
Ning Chen, Tao Han, Shuailong Li, Shufang Su, Wei Su and Yongcheng Wu
Abstract: 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 χ2 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, |∆mΦ| < 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% C.L. allowed range of cos(β − α) is larger, especially for large values of tan β.
Keywords: Beyond standard model; Higgs physics
Rights: © The Authors. Article funded by SCOAP³. Open Access. This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.
DOI: 10.1007/JHEP08(2020)131
Grant ID: http://purl.org/au-research/grants/arc/DP180102209
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