Abstract
In this work, we consider a class of dark matter (DM) models where the DM does not directly interact with the Standard Model (SM) particles at the tree-level. Therefore, the coannihilation mechanism is crucial in achieving the correct DM relic abundance, which in turn requires the coannihilating partner to be close in mass to the actual DM particle. In our systematisation of the models’ class, the mediator and the coannihilation partner are assumed to be charged under QCD interactions. This last feature calls for a scrutiny of non-perturbative effects, namely Sommerfeld factors and bound-state formation, on the annihilations of the colored partner. Such non-perturbative effects are illustrated with an example model comprising a scalar leptoquark mediator, a Dirac vector-like fermion coannihilation partner, and a singlet DM fermion. Phenomenological features of this model, namely DM direct and indirect detection prospects, collider implications, and impact on the muon anomalous magnetic moment, are discussed.
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Acknowledgments
S.B. thanks Mikko Laine and Gramos Qerimi for useful discussions. The work of S.B. is supported by the Swiss National Science Foundation (SNSF) under the Ambizione grant PZ00P2_185783.
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Biondini, S., Chowdhury, T.A. & Saad, S. Non-perturbative effects for dark sectors with QCD portals. J. High Energ. Phys. 2023, 2 (2023). https://doi.org/10.1007/JHEP08(2023)002
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DOI: https://doi.org/10.1007/JHEP08(2023)002