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DESY Theory Seminar
Theory: Long-lived particles at present and future colliders
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Europe/Berlin
SR2
SR2
Description
In the search for physics beyond the Standard Model, long-lived particles (LLPs) have emerged as promising candidates and are being investigated in various ongoing experiments. We begin by discussing their unique signatures in LHC experiments and exploring novel search strategies for detecting them. Future lepton colliders, such as the FCC-ee, will provide an excellent opportunity to study LLPs due to their clean environment and enhanced particle identification capabilities. We examine the potential of the proposed Innovative Detector for an Electron-Positron Accelerator (IDEA) at FCC-ee for detecting LLPs produced from B-meson and Higgs boson decays. We analyse benchmark scenarios for different final states that can result from LLP decays, including a detailed assessment of the long-lived hadronic background from the Standard Model. Furthermore, we propose dedicated LLP detectors for future colliders—DELIGHT and FOREHUNT—designed to optimise performance for detecting LLPs from B-meson and Higgs boson decays. We also discuss the role of the DELIGHT detector as a shared detector for both FCC-ee and FCC-hh. Additionally, we briefly address the potential of the FCC-hh.
