Speaker
Mr
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 how asymmetries can arise purely from $2 \leftrightarrow 2$ annihilations instead of the usual $1 \leftrightarrow 2$ decays and inverse decays. 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. I will also discuss a baryogenesis scenario in which annihilations and decays compete in creating the baryon asymmetry. Annihilations may actually dominate over decays in determining the final asymmetry in certain areas of parameter space. Such ideas could also have applications in asymmetric dark matter models.
Author
Mr
Iason Baldes
(University of Melbourne)
Co-authors
Kalliopi Petraki
(Nikhef)
Nicole Bell
(University of Melbourne)
Raymond Volkas
(The University of Melbourne)
