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arXiv · 2311.03995

Quantum collider probes of the fermionic Higgs portal

U. Haisch·M. Ruhdorfer·K. Schmid·A. Weiler
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Abstract

We explore the sensitivity of future hadron colliders to constrain the fermionic Higgs portal, with a focus on scenarios where the new fermions cannot be directly observed in exotic Higgs decays. This portal emerges in various models including twin-Higgs scenarios and dark matter models, posing significant challenges for collider tests. Working in an effective field theory (EFT), we determine the reach of the high-luminosity option of the Large Hadron Collider (HL-LHC), the high-energy upgrade of the LHC (HE-LHC) and a proposed Future Circular Collider (FCC) in probing the fermionic Higgs portal through off-shell and double-Higgs production. Notably, we find that quantum-enhanced indirect probes offer a better sensitivity than other direct Higgs measurements. We argue that this finding is valid in a wide class of ultraviolet realisations of the EFT. Our study presents a roadmap of a multifaceted search strategy for exploring the fermionic Higgs portal at forthcoming hadron machines.

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U. Haisch, M. Ruhdorfer, K. Schmid, A. Weiler. 2023-11-07. Quantum collider probes of the fermionic Higgs portal. https://arxiv.org/abs/2311.03995

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