Hitting the Thermal Target for Leptophilic Dark Matter at Future Lepton Colliders

Cesarotti, Cari; Krnjaic, Gordan

doi:10.1103/w1bw-w7wt

Hitting the Thermal Target for Leptophilic Dark Matter at Future Lepton Colliders

Journal Article · Wed Oct 22 00:00:00 EDT 2025 · Physical Review Letters

DOI:https://doi.org/10.1103/w1bw-w7wt· OSTI ID:2407244

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Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Univ. of Chicago, IL (United States); Univ. of Chicago, IL (United States). Kavli Inst. for Cosmological Physics (KICP)

We study future lepton collider prospects for testing predictive models of leptophilic dark matter (DM) candidates with a thermal origin. We calculate experimental milestones for testing the parameter space compatible with freeze-out and the associated collider signals at past, present, and future facilities. This analysis places new limits on such models by leveraging the utility of lepton colliders. At 𝑒+⁢𝑒− machines, we make projections using precision 𝑍 -pole observables from 𝑒+⁢𝑒−→ℓ+⁢ℓ−+𝐸 signatures at large electron-positron collider and future projections for future circular collider (ee) in these channels. Additionally, a muon collider could also probe new thermal relic parameter space in this scenario via 𝜇+⁢𝜇−→𝑋+𝐸 , where 𝑋 is any easily identifiable standard model object. Collectively, these processes can probe much of the parameter space for which DM direct annihilation to ℓ+⁢ℓ− yields the observed relic density in Higgs-like models with mass-proportional couplings to charged leptons.

View Accepted Manuscript (DOE)

Research Organization:: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: AC02-07CH11359; SC0012567

OSTI ID:: 2407244

Report Number(s):: FERMILAB-PUB--4-0124-T; MIT--CTP/5703; oai:inspirehep.net:2773824; arXiv:2404.02906

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 17 Vol. 135; ISSN 1079-7114; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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