Abstract
We study a simplified Dark Matter model in the Dark Minimal Flavour Violation framework. Our model complements the Standard Model with a flavoured Dark Matter Majorana triplet and a coloured scalar mediator that share a Yukawa coupling with the right-handed up-type quarks with the coupling matrix λ. We extend previous work on this topic by exploring a large range of cosmologically viable parameter space, including the coannihilation region and, in particular, the region of conversion-driven freeze-out, while considering constraints from \( {D}^0\hbox{--} {\overline{D}}^0 \) mixing as well as constraints from direct and indirect Dark Matter searches. We find various realisations of conversion-driven freeze-out within the model, that open up allowed windows of parameter space towards small mass splittings and very weak Dark Matter couplings. Finally, we probe the model by reinterpreting current LHC searches for missing energy and long-lived particles. We point out gaps in the coverage of current constraints as well as new opportunities to search for the model at the LHC, in particular, the charge asymmetry in single-top production associated with jets and missing energy.
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Acknowledgments
We thank Margarete Mühlleitner for her collaboration in the early stages of this work. This research was supported by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under grant 396021762 — TRR 257. J.H. acknowledges support by the Alexander von Humboldt Foundation via the Feodor Lynen Research Fellowship for Experienced Researchers and the Feodor Lynen Return Fellowship.
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Acaroğlu, H., Blanke, M., Heisig, J. et al. Flavoured Majorana Dark Matter then and now: from freeze-out scenarios to LHC signatures. J. High Energ. Phys. 2024, 179 (2024). https://doi.org/10.1007/JHEP06(2024)179
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DOI: https://doi.org/10.1007/JHEP06(2024)179