Long-Lived Light Mediators from Higgs boson Decay at HL-LHC, FCC-hh and a Proposal of Dedicated LLP Detectors for FCC-hh

Kavli Affiliate: Shigeki Matsumoto

| First 5 Authors: Biplob Bhattacherjee, Shigeki Matsumoto, Rhitaja Sengupta, ,

| Summary:

We study the pair production of the long-lived mediator particles from the
decay of the SM Higgs boson and their subsequent decay into standard model
particles. We compute the projected sensitivity, both model-independently and
with a minimal model, of using the muon spectrometer of the CMS detector at the
HL-LHC experiment for ggF, VBF, and Vh production modes of the Higgs boson and
various decay modes of the mediator particle, along with dedicated detectors
for LLP searches like CODEX-b and MATHUSLA. Subsequently, we study the
improvement with the FCC-hh detector at the 100,TeV collider experiment for
such long-lived mediators, again focusing on the muon spectrometer. We propose
dedicated LLP detector designs for the 100,TeV collider experiment, DELIGHT
(textbf{De}tector for textbf{l}ong-ltextbf{i}ved particles at hitextbf{gh}
energy of 100,textbf{T}eV), and study their sensitivities.

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