Minimal Dark Matter and Leptogenesis

TL;DR

This paper explores a minimal dark matter candidate within a supersymmetric framework, linking its asymmetric abundance to leptogenesis via right-handed neutrino decays, and predicts detectable collider signatures.

Contribution

It introduces a novel scenario connecting minimal dark matter with leptogenesis through right-handed neutrino decay in supersymmetry, with detailed Boltzmann equation analysis.

Findings

Dark matter mass around 100 GeV consistent with gauge interactions

Predicted long-lived charged scalars and fermions detectable at LHC

Efficient generation of dark matter and lepton asymmetries through decay processes

Abstract

A Dirac fermion carrying an integral weak isospin and the vanishing hypercharge is considered as its neutral component can be a promising dark matter candidate (called the minimal dark matter) whose mass is of order 100 GeV. While the symmetric population annihilates away due to a rapid gauge interaction, its asymmetric abundance is supposed to be produced by the decay of a right-handed neutrino superfield in the supersymmetric type I seesaw mechanism. The efficiencies for generating the dark matter and lepton asymmetries are calculated by solving a set of approximate Boltzmann equations. A spectacular feature of this scenario is the existence of a long-lived singly- or multiply-charged scalar and a shorter-lived singly-charged fermion whose tracks can be readily looked for at the LHC.