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

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/Lambda -> f (f) over bar, V V, V h, 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)+/- < 800 GeV, the wrong-sign Yukawa regions are excluded largely except for the tiny allowed region around cos(beta - alpha) is an element of (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 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 GeV compared to it at tree level. We also conclude Higgs direct searches works better on constraining lambda v(2) approximate to 0 GeV range than theoretical constraints. We also find that the loop-level wrong-sign Yukawa limit only occurs at mass decoupling scale.

Automated summary

In the framework of 2HDM, exploration of the wrong-sign Yukawa region is conducted through direct and indirect searches up to one-loop level. For Type-II 2HDM at the tree level, the wrong-sign Yukawa regions are largely excluded for degenerate heavy Higgs mass below 800 GeV.