Monday, January 25 2021
11:30 - 12:45

IMSc Webinar

Phenomenological Aspects of a Class of U(1) Extensions of the Standard Model with Inverse Seesaw

Vishnudath K.N.


The Standard Model (SM) of particle physics has been very successful in explaining a wide range of experimental observations, and the discovery of the Higgs boson at the Large Hadron Collider has put the SM on a firm ground. However, despite its success in explaining most of the experimental data, the SM can not address certain issues such as the non-zero neutrino masses and the existence of dark matter (DM) . This motivates studies beyond the SM, in particular, models that can accommodate neutrino mass and DM. Among the various scenarios that have been proposed in the literature, the models in which the SM is extended by a U(1) gauge group has received some attention. I will talk about a class of gauged U(1) extensions of the SM, where active light neutrino masses are generated by an inverse seesaw mechanism. Instead of considering one particular model, the U(1) charges of all the fermions can be expressed in terms of the U(1) charges of the SM Higgs and the new complex scalar. I will discuss the results of our comprehensive study of the bounds on the model parameters from low energy neutrino data, vacuum stability, perturbative unitarity and DM as well as collider constraints. In addition to the standard WIMP (weakly interacting massive particles) DM candidates whose relic density is generated by freeze-out, I will also discuss the possibility of generating the sterile neutrino DM relic density by the so-called freeze-in mechanism.

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