What does this research mean for the field?

A sub-GeV vector dark matter model featuring a non-Abelian dark SU(2)D sector and a magnetic dipole portal possesses a viable parameter space consistent with current cosmological and experimental constraints, and can be effectively probed by combining fixed-target searches with direct detection. Novelty: ClaimNovelty.NOVEL_FINDING. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To construct a viable sub-GeV vector dark matter model using an effective magnetic dipole portal and examine its signatures across cosmological observations and laboratory experiments.

August 29, 2026Journal of High Energy PhysicsOpen Access

Light vector dark matter via a magnetic dipole portal: bridging direct detection and fixed-target searches

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To construct a viable sub-GeV vector dark matter model using an effective magnetic dipole portal and examine its signatures across cosmological observations and laboratory experiments.
Augmented the Standard Model with a dark SU(2) gauge group spontaneously broken by scalar doublet and triplet vacuum expectation values.
Modeled interactions between sectors via a dimension-5 kinetic mixing portal that induces effective magnetic dipole couplings to the photon and Z boson.
Calculated dark matter thermal relic abundance and mapped parameter constraints across direct detection, colliders, Big Bang Nucleosynthesis, and cosmic microwave background observations.
Identified a sizable viable parameter space across sub-GeV dark matter masses compatible with observed thermal relic abundance and current experimental bounds.
Demonstrated that an inverse mass hierarchy between dark matter and the dark gauge boson induces distinctive signatures in fixed-target experiments like LDMX through off-shell bremsstrahlung and dark Higgs-strahlung.
Found that the most restrictive experimental constraints currently arise from direct detection, Big Bang Nucleosynthesis, colliders, and the cosmic microwave background.

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Implication

Theoretical study reveals viable parameter space for sub-GeV vector dark matter, highlighting the necessity of combining fixed-target experiments with direct detection searches.

Cite This Study

A 2026 study studied this question.

synapsesocial.com/papers/6a9298aa8e5d7d1fc0c1081d https://doi.org/10.1007/jhep08(2026)211

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Implication

Theoretical study reveals viable parameter space for sub-GeV vector dark matter, highlighting the necessity of combining fixed-target experiments with direct detection searches.

Light vector dark matter via a magnetic dipole portal: bridging direct detection and fixed-target searches

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Discussion

Implication

Cite This Study

Light vector dark matter via a magnetic dipole portal: bridging direct detection and fixed-target searches

Key Points

Discussion

Implication

Cite This Study

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