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

TL;DR

This paper investigates the potential to detect the effects of a type-II seesaw model on Higgs production with a photon at future linear colliders, focusing on loop processes sensitive to charged Higgs particles.

Contribution

It provides a detailed analysis of Higgs-photon associated production in the type-II seesaw model, highlighting how charged Higgs bosons influence cross sections and couplings at the one-loop level.

Findings

Charged Higgs bosons can alter cross sections by up to ±25% compared to the Standard Model.

The study links Higgs couplings to charged Higgs particles, enabling potential experimental probes.

Differential cross sections are computed for various center of mass energies.

Abstract

We consider the production of a single Standard Model (SM) Higgs boson ($h^0$) 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 $e^+e^- \to h^0\gamma$ and $e^-\gamma \to e^- h^0$, we show that it is possible to correlate the total cross section predictions with the couplings $h^0\gamma\gamma$ and $h^0\gamma Z$ 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 $H^\pm$ and $H^{\pm\pm}$ can be as large as $\pm$ 25\% with respect to the SM predictions. For both processes, we also present differential cross section for different center of mass energy.