Kavli Affiliate: Shigeki Matsumoto
| First 5 Authors: Biplob Bhattacherjee, Camellia Bose, Herbi K. Dreiner, Nivedita Ghosh, Shigeki Matsumoto
| Summary:
In the search for beyond the Standard Model (SM) physics, long-lived
particles (LLPs) have emerged as potential candidates and are being explored in
various ongoing experiments. Future lepton colliders, such as the FCC-ee, shall
provide an excellent opportunity to probe LLPs, owing to their clean
environment and improved particle identification. This study investigates the
potential of the proposed Innovative Detector for an Electron-Positron
Accelerator (IDEA) detector at FCC-ee in the detection of LLPs produced from
$B$-meson and Higgs boson decays. We explore benchmark scenarios for different
final states resulting from LLP decays, including a detailed analysis of the SM
long-lived hadronic background. Additionally, we propose dedicated LLP
detectors with different configurations, dimensions, and locations with respect
to the IDEA detector. DELIGHT B, originally proposed as a dedicated LLP
detector for the FCC-hh, stands out as the detector with the maximum efficiency
for detecting LLPs produced at FCC-ee. We find that cylindrical detector
configurations, if feasible to construct around the IDEA detector, would also
enhance sensitivity for LLPs mostly decaying outside it.
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