Description:

Title: Dirac neutrinos and Dark Matter from gauged B-L symmetry

Speaker: Rahul Srivastava, IMSc
 

Abstract: 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 masses for neutrinos. We discuss the phenomenological consequences of this scenario  including an application to neutrino mixing with S_3 flavour symmetry and the possibility of long-lived dark matter.