Hidden particle production at the ILC

TL;DR

This paper explores the potential to detect and distinguish a hidden scalar particle from the Higgs boson at the ILC, using realistic simulations to assess measurement feasibility.

Contribution

It provides a detailed analysis of hidden scalar production at the ILC and evaluates how well it can be differentiated from the Higgs boson in collider experiments.

Findings

Hidden scalars can be produced at the ILC with detectable signals.

The ILC can distinguish hidden scalars from the Higgs boson under certain conditions.

Simulation results support the feasibility of identifying hidden scalars at future colliders.

Abstract

In a class of new physics models, new physics sector is completely or partly hidden, namely, singlet under the Standard Model (SM) gauge group. Hidden fields included in such new physics models communicate with the Standard Model sector through higher dimensional operators. If a cutoff lies in the TeV range, such hidden fields can be produced at future colliders. We consider a scalar filed as an example of the hidden fields. Collider phenomenology on this hidden scalar is similar to that of the SM Higgs boson, but there are several features quite different from those of the Higgs boson. We investigate productions of the hidden scalar at the International Linear Collider (ILC) and study the feasibility of its measurements, in particular, how well the ILC distinguishes the scalar from the Higgs boson, through realistic Monte Carlo simulations.