One-loop radiative corrections to $e^{+}{e}^{-}\to Z{h}^0/H^0{A}^0$ in the Inert Higgs Doublet Model

Abstract

We compute the full one-loop radiative corrections (including both weak and QED corrections) for two processes $e^{+}{e}^{-}\to Z{h}^0,H^0{A}^0$ in the Inert Higgs Doublet model (IHDM). Up to $O({\alpha }_w)$ and $O({\alpha }_{em})$ order, we use FeynArts/FormCalc to compute the one-loop virtual corrections and Feynman Diagram Calculation (FDC) to evaluate the real emission, respectively. Being equipped with these computing tools, we investigate radiative corrections of new physics for both the degenerate and non-degenerate scenarios with three typical collision energies of future electron-positron colliders: 250 GeV, 500 GeV, and 1000GeV. By scanning the parameter space of IHDM, we identify the allowed regions which are consistent with constraints and bounds, from both theoretical and experimental sides. We find that the radiative corrections of the IHDM to $e^{+}{e}^{-}\to Z{h}^0$ can be sizeable and are within the detection potentials of future Higgs factories. We also find that the new physics of IHDM could also be directly detected by observing the process $e^{+}{e}^{-}\to H^0{A}^0$ which could have large enough production rate. We propose five benchmark points and examine their salient features which can serve as physics targets for future electron-positron colliders, such as CEPC/CLIC/FCC-ee/ILC as well as for LHC.

arXiv comment43 pages, 17 figures, minor changes

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