Associated production of SM Higgs with a photon in type-II seesaw models at the ILC

Abstract

AbstractWe consider the production of a single Standard Model (SM) Higgs boson ($$h^0$$h0) in association with a photon at the future Linear collider (LC) in the context of a type-II seesaw model. The type-II seesaw model extends the SM particle content by adding one triple Higgs where its Higgs coupling is a key parameter of the scalar potential triggering the electroweak symmetry-breaking mechanism in the SM. It is a well motivated model since it provides neutrino masses and mixing. The LC presents a particularly interesting possibility to probe Higgs couplings due to the clean beams in the initial state. We study the one loop processes $$e^+e^- \rightarrow h^0\gamma $$e+e-→h0γ and $$e^-\gamma \rightarrow e^- h^0$$e-γ→e-h0, we show that it is possible to correlate the total cross section predictions with the couplings $$h^0\gamma \gamma $$h0γγ and $$h^0\gamma Z$$h0γZ which are sensitive to the presence of singly and doubly charged Higgs. For parameter points allowed by the current experimental constraints, our numerical results show that the effect of $$H^\pm $$H± and $$H^{\pm \pm }$$H±± can be as large as ± 25% with respect to the SM predictions. For both processes, we also present differential cross section for different center of mass energy.