Full one-loop radiative corrections to e^+ e^-→ H^+H^- in the inert doublet model
arxiv(2022)
摘要
We compute the full one-loop radiative corrections for charged scalar pair
production e^+e^-→ H^+H^- in the inert doublet model. The on-shell
renormalization scheme has been used. We take into account both the weak
contributions as well as the soft and hard QED corrections. We compute both the
real emission and the one-loop virtual corrections using the Feynman
diagrammatic method. The resummed cross section is introduced to cure the
Coulomb singularity which occurs in the QED corrections. We have analyzed the
parameter space of the inert doublet model in three scenarios after taking into
account theoretical constraints, the collider experimental bounds, and dark
matter search bounds as well. It is found that the weak interaction dominates
the radiative corrections, and its size is determined by the triple Higgs
coupling λ_h^0 H^+ H^-, which is further connected to the mass of the
charged scalar. In the scenario where all the constraints are taken into
account, we find that for √(s)=250 GeV and √(s)=500 GeV, the weak
corrections are around -6%∼-5% and -10%∼ -3%, respectively.
While for √(s)=1000 GeV, the weak corrections can reach -15%∼
+25%. The new feature is that the weak corrections can be positive near the
threshold when the charged scalar is heavier than 470 GeV. Six benchmark points
for future collider searches have been proposed.
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