29 September 2015 to 2 October 2015
DESY Hamburg
Europe/Berlin timezone

Minimal Asymmetric Dark Matter

30 Sep 2015, 15:15
15m
Main Auditorium (DESY Hamburg)

Main Auditorium

DESY Hamburg

Speaker

Dr Martin Krauss (INFN - LNF (Frascati))

Description

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 $\chi$ 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 quintuplets or larger SU(2) representations, and with a mass in the few TeV range.

Primary author

Dr Martin Krauss (INFN - LNF (Frascati))

Co-authors

Dr Enrico Nardi (INFN - LNF (Frascati)) Dr Sofiane Boucenna (INFN - LNF (Frascati))

Presentation Materials