Beyond the Standard Model Higgs physics: Hunting $h \rightarrow bs$ with Higgs-strahlung at CEPC and FCC-ee

TL;DR

This paper explores the potential of future electron-positron colliders, CEPC and FCC-ee, to detect rare Higgs decays into bottom and strange quarks, offering insights into physics beyond the Standard Model.

Contribution

It presents a detailed projection of the sensitivity of CEPC and FCC-ee to the flavor-changing decay $h ightarrow bs$ within the 2HDM-III framework, using advanced multivariate analysis techniques.

Findings

Projected $5\sigma$ sensitivity to BR($h \rightarrow bs$) down to $10^{-4}$

Demonstrates the colliders' capability to probe new physics beyond the Standard Model

Highlights the importance of flavor-changing Higgs decays as new physics signatures.

Abstract

The next generation of $e^{-}e^{+}$ colliders, particularly the CEPC and FCC-ee, will offer unprecedented precision to probe Higgs boson properties. In this work, we investigate the flavor-changing decay $h \rightarrow bs$ produced via Higgs-strahlung in the framework of the Two-Higgs-Doublet Model of Type III (2HDM-III). Using multivariate techniques, we project the signal significance for CEPC and FCC-ee, considering dominant backgrounds and systematic uncertainties. Our results demonstrate that these colliders could achieve $5\sigma$ sensitivity to $\text{BR}(h \rightarrow bs)$ down to $10^{-4}$, providing a unique window into physics beyond the Standard Model.