Sensitivity of the FACET experiment to Heavy Neutral Leptons and Dark Scalars

Abstract

We analyze the potential of the recently proposed experiment FACET (Forward-Aperture CMS ExTension) to search for new physics. As an example, we consider the models of Higgs-like scalars with cubic and quartic interactions and Heavy Neutral Leptons. We compare the sensitivity of FACET with that of other proposed "intensity frontier" experiments, including FASER2, SHiP, etc. and demonstrate that FACET could probe an interesting parameter space between the current constraints and the potential reach of the above mentioned proposals.

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• Feebly-Interacting Particles:FIPs 2020 Workshop Report
• The Present and Future Status of Heavy Neutral Leptons
• FORESEE: FORward Experiment SEnsitivity Estimator for the LHC and future hadron colliders
• FACET: A new long-lived particle detector in the very forward region of the CMS experiment
• Higgs portal to dark matter and $B\to K^{(\ast )}$ decays
• Testing the seesaw mechanisms via displaced right-handed neutrinos from a light scalar at the HL-LHC
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Cited by in corpus (7)

• Sensitivities to feebly interacting particles: public and unified calculations
• Reinterpretation of searches for long-lived particles from meson decays
• Searches for long-lived dark photons at proton accelerator experiments
• Searching for heavy neutral leptons coupled to axion-like particles at the LHC far detectors and SHiP
• Towards the optimal beam dump experiment to search for feebly interacting particles
• Long-lived Light Mediators in a Higgs Portal Model at the FCC-ee
• Sensitivities to feebly interacting particles: public and unified calculations