Di-Higgs Decay of Stoponium at Future Photon-Photon Collider

TL;DR

This paper investigates the potential to detect stoponium decaying into Higgs pairs at a future photon-photon collider, highlighting the conditions for a 5-sigma discovery and implications for the MSSM.

Contribution

It demonstrates the feasibility of detecting stoponium via di-Higgs decay at a future collider and links the measurement to MSSM parameters.

Findings

5σ detection possible with 1 ab^{-1} luminosity for cross sections around 0.1 fb

Detectability for stoponium masses below 800 GeV at 1 TeV ILC

Implications for MSSM stop sector from cross section measurements

Abstract

We study the detectability of the stoponium in the di-Higgs decay mode at the photon-photon collider option of the International $e^+e^-$ Linear Collider (ILC), whose center-of-mass energy is planned to reach $\sim 1$ TeV. We find that $5\sigma$ detection of the di-Higgs decay mode is possible with the integrated electron-beam luminosity of $1 {\rm ab}^{-1}$ if the signal cross section, $\sigma(\gamma \gamma \rightarrow \sigma_{\tilde{t}_1} \rightarrow hh)$, of ${\cal O}(0.1)$ fb is realized for the stoponium mass smaller than $\sim$ 800 GeV at 1 TeV ILC. Such a value of the cross section can be realized in the minimal supersymmetric standard model (MSSM) with relatively large trilinear stop-stop-Higgs coupling constant. Implication of the stoponium cross section measurement for the MSSM stop sector is also discussed.