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  • Open Access

Searching for leptophilic composite asymmetric dark sector at e+e− colliders

Chih-Ting Lu1,2 and Changbin Xi1

  • 1Department of Physics and Institute of Theoretical Physics, Nanjing Normal University, Nanjing, 210023, People’s Republic of China
  • 2Nanjing Key Laboratory of Particle Physics and Astrophysics, Nanjing, 210023, People’s Republic of China

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Phys. Rev. D 112, 095027 – Published 19 November, 2025

DOI: https://doi.org/10.1103/xsmv-f97b

Abstract

Composite asymmetric dark matter (ADM) models provide a well-motivated paradigm that simultaneously explains dark matter (DM) relic density and matter-antimatter asymmetry. In these models, the mass of the DM candidate (the lightest dark baryon) is generated through the dark confinement scale dynamics. Although the leptophilic composite ADM model offers a viable framework, comprehensive studies of its collider phenomenology are absent. This work systematically explores novel signatures from the leptophilic composite asymmetric dark sector at both low-energy and high-energy e+e− colliders as well as other existing collider constraints. We demonstrate detectability of TeV-scale mediators along with sub-GeV to GeV-scale lightest dark mesons at Belle II and its proposed far detector, GAZELLE, as well as Circular Electron Positron Collider/Future Circular Collider-electron-positron experiments. Moreover, these experiments exhibit complementary coverage of the model parameter space.

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Information

Phys. Rev. D 112, 095027– Published 19 November, 2025
  • Received 22 September 2025
  • Accepted 28 October 2025
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