Higgs boson production in photon-photon collision at ILC: a comparative study in different little Higgs models

TL;DR

This study compares Higgs boson production rates in photon-photon collisions at ILC across various little Higgs models, revealing significant differences from the Standard Model and potential for model discrimination through precision measurements.

Contribution

It provides a comparative analysis of Higgs production in different little Higgs models at ILC, highlighting distinctive predictions and decay modes for experimental testing.

Findings

Production rate can be enhanced in LHT-II for some parameters.

Significant suppression (up to 60%) in SLH, LHT-I, LHT-II models.

Suppression linked to specific decay modes like h->ηη and h->A_H A_H.

Abstract

We study the process \gamma\gamma->h->bb_bar at ILC as a probe of different little Higgs models, including the simplest little Higgs model (SLH), the littlest Higgs model (LH), and two types of littlest Higgs models with T-parity (LHT-I, LHT-II). Compared with the Standard Model (SM) prediction, the production rate is found to be sizably altered in these little Higgs models and, more interestingly, different models give different predictions. We find that the production rate can be possibly enhanced only in the LHT-II for some part of the parameter space, while in all other cases the rate is suppressed. The suppression can be 10% in the LH and as much as 60% in both the SLH and the LHT-I/LHT-II. The severe suppression in the SLH happens for a large \tan\beta and a small m_h, in which the new decay mode h->\eta\eta (\eta is a light pseudo-scalar) is dominant; while for the LHT-I/LHT-II the large suppression occurs when f and m_h are both small so that the new decay mode h->A_H A_H is dominant. Therefore, the precision measurement of such a production process at the ILC will allow for a test of these models and even distinguish between different scenarios.