# COSMO-15, the 19th annual International Conference on Particle Physics and Cosmology

7-11 September 2015
Warsaw, Poland
Europe/Zurich timezone

## Minimal Asymmetric Dark Matter

8 Sep 2015, 16:30
20m
Rm 207 ()

### Speaker

Martin Krauss (INFN - Laboratori Nazionali di Frascati, Italy)

### Description

n 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 $\chi$ carrying hypercharge, assuming that at temperatures above the electroweak phase transition an effective operator enforces chemical equilibrium between $\chi$ 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 in large $SU(2)$ representations, and with a mass in the few TeV range. (Based on arXiv:1503.01119) arXiv:1503.01119 arXiv:1503.01119arXiv:1503.01119 arXiv:1503.01119