Natural Baryogenesis from Unnatural Supersymmetry

Abstract

We demonstrate here that the mini-split version of the Minimal Supersymmetric Standard Model (MSSM) including R-parity violating couplings naturally provides all the necessary ingredients for a novel baryogenesis mechanism. The baryogenesis is triggered by the late decay of a TeV scale bino after its thermal freezeout. A μ-term larger than the sfermion masses is necessary for obtaining sufficient baryon asymmetry. Two example models of direct baryogenesis and leptogenesis are proposed, with viable parameter spaces presented. The cosmological conditions for the models--in particular, the requirements of a long lifetime of bino and sufficient baryon asymmetry--point towards the mini-split scale of $\sim$ 100-1000 TeV for the sfermion masses. This provides an independent motivation for mini-split SUSY, along with the constraints from flavor physics and Higgs mass measurement. We also discuss the potential multi-pronged search for the signatures of such models, including those at the Large Hadron Collider (LHC) and the low energy experiments at the intensity frontier.

17 pages, 7 figures

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• Dark Matter and Baryon Asymmetry production from out-of-equilibrium decays of Supersymmetric states