Low scale leptogenesis and dark matter candidates in an extended seesaw model

We consider a variant of the seesaw mechanism by introducing extra singlet neutrinos and a singlet scalar boson, and show how low scale leptogenesis is successfully realized in this scenario. We examine whether the newly introduced neutral particles, either singlet Majorana neutrinos or singlet scalar bosons, can be dark matter candidates. We also discuss the implications of dark matter detection through scattering off the nucleus of the detecting material on our scenarios for dark matter. In addition, we study the implications for the search for invisible Higgs decay at the Large Hadron Collider, which may serve as a probe for our scenario for dark matter.