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

Kavli Affiliate: Shigeki Matsumoto

| First 5 Authors: Biplob Bhattacherjee, Herbi K. Dreiner, Nivedita Ghosh, Shigeki Matsumoto, Rhitaja Sengupta

| Summary:

In this paper, we propose a dedicated forward detector, FOREHUNT
(FORward~Experiment~for~HUNdred~TeV), for 100 TeV FCC-hh for the detection of
light long-lived particles (LLP) coming from $B$-meson decay. We calculate the
signal acceptance as a function of mass and proper decay length of the LLP for
100 TeV and interpret our result in terms of model parameters for models of
dark Higgs scalar and heavy neutral leptons. We also compare the sensitivity
with proposed transverse detectors like MATHUSLA, CODEX-b for HL-LHC, and
DELIGHT (Detector for long-lived particles at high energy of 100 TeV) for
FCC-hh. Our analysis reveals that if the LLP is light ($lesssim 4.4$ GeV) and
has a low proper decay length ($<10$ m), a forward detector like FOREHUNT is
the best option to look for the decaying LLP, while DELIGHT is preferable for
higher proper decay lengths.

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