Speaker
Description
We study the one-loop prediction for the single production of the Standard Model (SM) Higgs boson ($h_1$) in association with a photon in electron-positron collision in the context of the Two Higgs Doublet Type II seesaw Model (THDMcT). This type of process is directly sensitive to one-loop impacts because it has no amplitude at the tree level. The cross section in the standard model (SM) is maximal around$\sqrt s=250$ GeV, in this work, we demonstrate the extent to which the production rate can be increased or decreased by the introduction of new physics. We study the one-loop processes $e^+e^- \to h_1\gamma$ and $e^-\gamma \to e^- h_1$ with and without the modified Veltman conditions. We also discuss the correlation with $h_1\gamma\gamma$ and $h_1\gamma Z$ which are sensitive to the existence of singly and doubly charged Higgs. It is observed that charged scalars, when significantly coupled to a Higgs boson that resembles the Standard Model, can make substantial contributions to both the decay and production rates. For parameter points verified the actual experimental constraints and the theoretical constraints except the Veltman conditions, our numerical results show that the effect of $H_1^\pm$, $H_2^\pm$ and $H^{\pm\pm}$ can be as large $-10\% +4\%$ relative to the SM predictions. If, in addition, the modified Veltman conditions are also imposed, the effect of $H_1^\pm$, $H_2^\pm$ and $H^{\pm\pm}$ can be as large as $\pm2\%$ relative to the SM predictions.
