Probing loop effects in wrong-sign Yukawa coupling region of Type-II 2HDM

Abstract

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 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 GeV, the wrong-sign Yukawa regions are excluded largely except for the tiny allowed region around under the combined Higgs constraints. The excluded region is also nearly independent of parameter or . The situation changes a lot after including loop corrections to the indirect searches, for example , the region with will be stronger constrained to be totally excluded. Whilst parameter space with would get larger survived wrong-sign region for compared to it at tree level. We also conclude Higgs direct searches works better on constraining GeV range than theoretical constraints. We also find that the loop-level wrong-sign Yukawa limit only occurs at mass decoupling scale.