# Astroparticle Physics - A Joint TeVPA/ IDM Conference

23-28 June 2014
Amsterdam
Europe/Zurich timezone

## Asymmetric dark matter and $2 \leftrightarrow 2$ interactions

27 Jun 2014, 16:45
15m
Room 6 (Tuschinski Theatre)

### Room 6

#### Tuschinski Theatre

Presentation Particle Physics

### Speaker

Iason Baldes (University of Melbourne)

### Description

Common mechanisms invoked to explain particle antiparticle asymmetries involve the out-of-equilibrium and CP violating decay of a heavy particle. In this talk I discuss the role CP violating $2 \leftrightarrow 2$ annihilations can play -- together with the usual $1 \leftrightarrow 2$ decays and inverse decays -- in determining the final asymmetry. I will present a simple toy model to point out the salient features of such a scenario and to illustrate how an asymmetry can arise while respecting CPT and S-matrix unitarity. Annihilations may actually dominate over decays in determining the final asymmetry in certain areas of parameter space. In this scenario related asymmetries are created in two distinct low-energy sectors. Such a mechanism could explain asymmetric dark matter.

### Primary author

Iason Baldes (University of Melbourne)

### Co-authors

Kalliopi Petraki (Nikhef) Nicole Bell (University of Melbourne) Raymond Volkas (The University of Melbourne)

 Slides