Non-unitarity effects in a realistic low-scale seesaw model

TL;DR

This paper investigates non-unitarity effects in a low-scale inverse seesaw model, highlighting correlations among parameters, improving bounds, and assessing future experimental discovery potential at neutrino factories.

Contribution

It provides a detailed analysis of non-unitarity in a realistic inverse seesaw model with accessible heavy singlets, establishing parameter correlations and exploring experimental sensitivities.

Findings

Correlations among non-unitarity parameters are identified.

Improved bounds on non-unitarity effects are established.

Future neutrino factory sensitivities could detect these effects.

Abstract

We analyze the structure of the non-unitary leptonic mixing matrix in the inverse seesaw model with heavy singlets accessible at the LHC. In this model, unlike in the usual TeV seesaw scenarios, thelow-scale right-handed neutrinos do not suffer from naturalness issues. Underlying correlations among various parameters governing the non-unitarity effects are established, which leads to a considerable improvement of the generic non-unitarity bounds. In view of this, we study the discovery potential of the non-unitarity effects at future experiments, focusing on the sensitivity limits at a neutrino factory.