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In this paper, we propose a dedicated forward detector, FOREHUNT (FORwardExperiment for HUNdred TeV), for 100 TeV FCC-hh for the detection of lightlong-lived particles (LLP) coming from $B$-meson decay. We calculate the signalacceptance as a function of mass and proper decay length of the LLP for 100 TeVand interpret our result in terms of model parameters for models of dark Higgsscalar and heavy neutral leptons. We also compare the sensitivity with proposedtransverse detectors like MATHUSLA, CODEX-b for HL-LHC, and DELIGHT (Detectorfor long-lived particles at high energy of 100 TeV) for FCC-hh. Our analysisreveals that if the LLP has low decay length < 10 m, a forward detector likeFOREHUNT is the best option to look for the decaying LLP, while DELIGHT ispreferable for higher decay lengths.

Light long-lived particles at the FCC-hh with the proposal for a dedicated forward detector FOREHUNT and a transverse detector DELIGHT