Abstract
Dark matter semi-annihilation is a process through which two dark matter candidates annihilate to a single dark matter particle and a non-dark matter particle. Such processes are common when the symmetry stabilizing the dark matter differs from ℤ2 and can lead to qualitatively different phenomenology. In this work, we study the viability of semi-annihilation models including one or two inert multiplets. For one multiplet, we show that there does not exist any viable model in which semi-annihilation is efficient. For two multiplets, semi-annihilation can be efficient, but the number of viable and technically natural models is limited. We then perform a detailed study of the most promising model, showing that the correct relic abundance can be obtained for a wide range of masses.
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Acknowledgments
C.-W. C would like to thank the High Energy Physics Theory Group at the University of Tokyo for their hospitality during his visit when part of this work was finished. This work was supported by the National Science and Technology Council under Grant No. NSTC-111-2112-M-002-018-MY3, the Ministry of Education (Higher Education Sprout Project NTU-112L104022), and the National Center for Theoretical Sciences of Taiwan.
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Beauchesne, H., Chiang, CW. Dark matter semi-annihilation for inert scalar multiplets. J. High Energ. Phys. 2024, 164 (2024). https://doi.org/10.1007/JHEP06(2024)164
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DOI: https://doi.org/10.1007/JHEP06(2024)164