Speaker
Description
Long-lived particles (LLPs) have a clear signature of physics beyond the Standard Model (BSM), characterized by displaced vertex or decay lengths corresponding to lifetimes of nanoseconds or longer. Lepton colliders provide a clean environment for LLP searches. This study employs full simulation data to investigate LLPs produced in Higgs decays via the process e+e−→ZH, where each LLP decays into visible final-state particles such as jets, charged leptons, or neutrinos.
This talk focuses on the 2‑lepton channels, including both dielectron and dimuon final states, which benefit from low background and precise tracking. Additionally, sensitivity in the hadronic decay mode (LLP->jets) is further improved using machine learning techniques. By combining multiple decay channels, we demonstrate the enhanced potential for LLPs at future lepton colliders. The signal sensitivity for the branching ratio of Higgs decaying into LLPs reaches a state-of-art limit of 1.0 × $10^{−6}$ with a statistics of 4 × $10^6$ Higgs.
| Session Selection | Particle and Nuclear Physics |
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