Minimal Asymmetric Dark Matter

Sofiane M. Boucenna; Martin B. Krauss; Enrico Nardi

doi:10.1016/j.physletb.2015.06.080

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arXiv · 1503.01119

Minimal Asymmetric Dark Matter

Sofiane M. Boucenna·Martin B. Krauss·Enrico Nardi

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Abstract

In the early Universe, any particle carrying a conserved quantum number and in chemical equilibrium with the thermal bath will unavoidably inherit a particle-antiparticle asymmetry. A new particle of this type, if stable, would represent a candidate for asymmetric dark matter (DM) with an asymmetry directly related to the baryon asymmetry. We study this possibility for a minimal DM sector constituted by just one (generic) $SU(2)_L$ multiplet $χ$ carrying hypercharge, assuming that at temperatures above the electroweak phase transition an effective operator enforces chemical equilibrium between $χ$ and the Higgs boson. We argue that limits from DM direct detection searches severely constrain this scenario, leaving as the only possibilities scalar or fermion multiplets with hypercharge $y = 1$, preferentially quintuplets or larger $SU(2)$ representations, and with a mass in the few TeV range.

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Sofiane M. Boucenna, Martin B. Krauss, Enrico Nardi. 2015-07-06. Minimal Asymmetric Dark Matter. https://doi.org/10.1016/j.physletb.2015.06.080

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