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Light thermal relics enabled by a second Higgs

by Johannes Herms, Sudip Jana, Vishnu P. K., Shaikh Saad

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Submission summary

Authors (as registered SciPost users): Johannes Herms
Submission information
Preprint Link:  (pdf)
Date accepted: 2023-03-07
Date submitted: 2022-09-30 14:37
Submitted by: Herms, Johannes
Submitted to: SciPost Physics Proceedings
Proceedings issue: 14th International Conference on Identification of Dark Matter (IDM2022)
Ontological classification
Academic field: Physics
  • High-Energy Physics - Phenomenology


Sub-GeV thermal relic dark matter typically requires the existence of a light mediator particle. We introduce the light two-Higgs-doublet portal, illustrated by a minimal UV-complete model for sub-GeV dark matter with kinematically forbidden annihilations into leptons. All new physics states in this scenario lie at or below the electroweak scale, affecting Higgs physics, the muon anomalous magnetic moment and potentially neutrino masses. Observation of radiative dark matter annihilation by future MeV gamma-ray telescopes would be key to unambiguously identify the scenario.

Published as SciPost Phys. Proc. 12, 046 (2023)

Reports on this Submission

Anonymous Report 1 on 2022-11-8 (Invited Report)

  • Cite as: Anonymous, Report on arXiv:2209.14882v1, delivered 2022-11-08, doi: 10.21468/SciPost.Report.6104


Discusses the possibility of light (sub-GeV) scalar mediator between a dark sector and the SM in the context of the 2 Higgs-Doublet Model (2HDM). I recommend this proceeding for publication.

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