Abstract
Recently many investigations have considered Majorana dark matter co-annihilating with bound states formed by a strongly interacting scalar field. However only the gluon radiation contribution to bound state formation and dissociation, which at high temperatures is subleading to soft 2 → 2 scatterings, has been included. Making use of a non-relativistic effective theory framework and solving a plasma-modified Schrödinger equation, we address the effect of soft 2 → 2 scatterings as well as the thermal dissociation of bound states. We argue that the mass splitting between the Majorana and scalar field has in general both a lower and an upper bound, and that the dark matter mass scale can be pushed at least up to 5…6TeV.
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Biondini, S., Laine, M. Thermal dark matter co-annihilating with a strongly interacting scalar. J. High Energ. Phys. 2018, 72 (2018). https://doi.org/10.1007/JHEP04(2018)072
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DOI: https://doi.org/10.1007/JHEP04(2018)072