Phenomenology of WIMPy baryogenesis models

TL;DR

This paper explores WIMPy baryogenesis, a novel mechanism linking dark matter annihilation to baryon asymmetry, extending the WIMP scenario and analyzing its parameter space under experimental constraints.

Contribution

It constructs a general effective field theory for WIMPy baryogenesis and evaluates the viable parameter space considering experimental bounds.

Findings

WIMP mass must be greater than 400 GeV due to LHC constraints.

A significant parameter space remains viable for WIMPy baryogenesis models.

The proposed models successfully relate baryon asymmetry to dark matter annihilation.

Abstract

A possible connection between the abundances of baryonic and dark matter (DM) has been explored so far mostly in the context of the so-called asymmetric DM. Recently, a very different mechanism, dubbed "WIMPy baryogenesis", has been proposed to relate the baryon asymmetry to DM annihilation. The DM candidate is a weakly interacting massive particle (WIMP), and the usual WIMP scenario is slightly extended to accommodate baryogenesis, which is accomplished around the time of DM freeze-out. We construct an effective field theory that encompasses a quite general class of models which implement the WIMPy baryogenesis. Under some reasonable, simplifying assumptions, we show that a good portion of the parameter space is allowed for these models, after experimental constraints are taken into account. Bounds from the LHC require that the WIMP be heavier than 400 GeV.