In many beyond Standard Model (BSM) theories such as the Next-to-Minimal Supersymmetric Standard Model (NMSSM), it is predicted that the SM-like Higgs boson can decay into SM particles through non-standard couplings or decay into non-SM particles directly.

The precision of the branching ratios and couplings of the Higgs boson that have been measured at the HL-LHC still allows a sizable fraction of invisible or exotic decays. It was estimated that the precision of the HL-LHC measurements of the Higgs couplings will not be better than 3 %. The proposed future collider in China – Circular Electron Positron Collider (CEPC) can measure the couplings and branching ratios to percent levels or even sub-percent levels. We study three promising channels at CEPC: invisible channel (H → invisible...[ Read more ]

In many beyond Standard Model (BSM) theories such as the Next-to-Minimal Supersymmetric Standard Model (NMSSM), it is predicted that the SM-like Higgs boson can decay into SM particles through non-standard couplings or decay into non-SM particles directly.

The precision of the branching ratios and couplings of the Higgs boson that have been measured at the HL-LHC still allows a sizable fraction of invisible or exotic decays. It was estimated that the precision of the HL-LHC measurements of the Higgs couplings will not be better than 3 %. The proposed future collider in China – Circular Electron Positron Collider (CEPC) can measure the couplings and branching ratios to percent levels or even sub-percent levels. We study three promising channels at CEPC: invisible channel (H → invisible), semi-visible channel (H → bb̄ + invisible), and visible channel (H → bbb̄b̄), and show the expected sensitivity S/√B5 σ in all three channels when the branching ratio of H → X₁⁰X₁⁰ , H → X₁⁰X₂⁰, and H → h₁h₁ or a₁a₁ were assumed to be 3.5%, 0.24% and 0.075%, respectively, and the integrated luminosity was assumed to be 5 ab^-1.