Mixed Singlet-Doublet Fermionic Dark Matter, Neutrino Mass and Collider Signatures

Abstract

The Dark Matter constitutes nearly 26.8% of the total energy budget of the universe as precisely measured by PLANCK and WMAP. One of the attractive candidates for dark matter is a Weakly Interacting Massive Particle(WIMP). A minimal model is proposed which contains one triplet scalar with hypercharge 2 and two vector like fermions: one singlet and a doublet in order to simultaneously explain neutrino mass and dark matter content of the universe.

The dark matter emerges out as a mixed state of the singlet fermion and the neutral component of the doublet. A Z2 symmetry stabilizes the dark matter. The triplet scalar gets an induced vev after the electroweak symmetry breaking and hence give Majorana masses to the neutrinos as well as to the dark matter. Due to the Majorana mass term of the dark matter, the Z mediated direct detection cross-section is forbidden but it can interact with the nuclithrough Higgs mediated chanel and hence can be probed in future running experiments like Xenon-1T. The charged companion of dark matter can give large displaced signature at the LHC.