Probing loop effects in wrong-sign Yukawa coupling region of Type-II 2HDM
2021
In the framework of 2HDM, we explore the wrong-sign Yukawa region with direct and indirect searches up to one-loop level. The direct searches include the latest $$H/A \rightarrow f{\bar{f}}, VV, Vh, hh$$
reports at current LHC, and the study of indirect Higgs precision measurements works with current LHC, future HL-LHC and CEPC. At tree level of Type-II 2HDM, for degenerate heavy Higgs mass $$m_A=m_H=m_{H^\pm }<800$$
GeV, the wrong-sign Yukawa regions are excluded largely except for the tiny allowed region around $$\cos (\beta -\alpha )\in (0.2,0.3)$$
under the combined Higgs constraints. The excluded region is also nearly independent of parameter $$m_{12}$$
or $$\lambda v^2=m_A^2-m_{12}^2/(\sin \beta \cos \beta )$$
. The situation changes a lot after including loop corrections to the indirect searches, for example $$m_A=1500 \text {~GeV}$$
, the region with $$\lambda v^2<0$$
will be stronger constrained to be totally excluded. Whilst parameter space with $$\lambda v^2>0$$
would get larger survived wrong-sign region for $$m_A=800 ~\text {~GeV}$$
compared to it at tree level. We also conclude Higgs direct searches works better on constraining $$\lambda v^2 \approx 0$$
GeV range than theoretical constraints. We also find that the loop-level wrong-sign Yukawa limit only occurs at mass decoupling scale.
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