Abstract
We study baryogenesis via a gaugino portal, the supersymmetric counterpart to the widely studied kinetic mixing portal, to a hidden sector. CP and baryon number violating decays of a hidden sector gaugino into the visible sector can produce the observed baryon asymmetry of the Universe. The tiny portal coupling is crucial in producing late out-of-equilibrium decays, after washout processes that can erase the asymmetry have gone out of equilibrium. We study this mechanism within various scenarios, including freeze-in or freeze-out of the hidden gaugino, as well as extended frameworks where the hidden sector contains a weakly interacting massive particle (WIMP) dark matter candidate. This mechanism can produce the desired asymmetry over a wide range of mass scales, including for hidden gaugino masses as low as 10 GeV. We also discuss possible related signals with direct collider searches, at low energy experiments, and in dark matter direct and indirect detection.
Highlights
In this paper, we explore how a hidden sector coupled to the Minimal Supersymmetric Standard Model (MSSM) via a kinetic mixing portal [4] may address one of the outstanding problems of particle physics and cosmology, the origin of the observed excess of matter over antimatter in our Universe
In low scale baryogenesis mechanisms one must be wary of inducing a too-large CP violation that would be visible in electric dipole moment (EDM) experiments, which are strongly constrained by measurements. (For recent discussions of the implications of EDM bounds for supersymmetric theories, see [14, 15].) In this paper, we demonstrate that the hidden sector implementation offers several novel features: the small portal mixing between the two sectors naturally provides the means to address the above problems, enabling low scale baryogenesis with rich phenomenology
Our framework consists of the MSSM extended by two key ingredients: baryon number violation via an RPV coupling, and a kinetic mixing portal to a U(1) symmetry residing in a hidden sector
Summary
Our framework consists of the MSSM extended by two key ingredients: baryon number violation via an RPV coupling, and a kinetic mixing portal to a U(1) symmetry residing in a hidden sector. The above RPV coupling λijk is constrained by various measurements, depending on the flavor indices (i, j, k). One can consider a minimal setup where all of the relevant hidden sector gaugino phenomenology arises from the portal coupling to the visible sector. Additional particles in the hidden sector may endow the hidden gaugino with additional interactions, which can affect baryogenesis. We outline these two possibilities in turn, before returning to discuss their phenomenology
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