Dirac Neutrinos and Dark Matter from Gauged B-L Symmetry

por Dr. Rahul Srivastava (Institute of Mathematical Science, Chennai, India)

miércoles 11 nov. 2015 12:00 → 13:00 Europe/Madrid

1001-Primera-1-1-1 - Paterna. Seminario (Universe)

 The gauged B-L symmetry is one of the simplest extension of standard model. In the conventional case, addition of three singlet right handed neutrinos each transforming as -1 under the B-L symmetry renders it anomaly free. It  is  usually assumed that the B-L symmetry is spontaneously broken by a singlet scalar having two units of B-L charge, resulting in a natural implementation of Majorana seesaw mechanism for neutrinos. However, as we discuss in this talk, there is another simple
anomaly free solution which leads to Dirac neutrinos with naturally small masses. We discuss the phenomenological consequences of this scenario including an application to neutrino mixing with S_3 flavour symmetry, the possibility of long-lived dark matter and the phenomenology of the Z' boson.