Minimal dark matter and leptogenesis

A Dirac fermion carrying an integral weak isospin and the vanishing hyper-charge is considered as a promising dark matter candidate (called the minimal dark matter) for its mass of order 100 GeV. While the symmetric population of the dark matter annihilates away due to a rapid gauge interaction, its asymmetric abundance is supposed to be produced together with the visible matter asymmetry through leptogenesis 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.