Quasi-Dirac neutrinos in the linear seesaw model

TL;DR

This paper explores a minimal linear seesaw model to explain Quasi-Dirac heavy neutrinos at low masses, analyzing dilepton ratios and experimental constraints, with prospects for detection at the LHC.

Contribution

It introduces a minimal linear seesaw framework for Quasi-Dirac neutrinos at GeV scales, linking dilepton ratios to neutrino properties and experimental bounds.

Findings

Dilepton ratio $R_{\ell \ell}$ varies between 0 and 1 for low neutrino masses.

Mass splitting equals light-neutrino mass $m_{\nu}$ in the model.

Experimental constraints tightly restrict the low-scale Quasi-Dirac neutrino parameter space.

Abstract

We implement a minimal linear seesaw model (LSM) for addressing the Quasi-Dirac (QD) behaviour of heavy neutrinos, focusing on the mass regime of $M_{N} \lesssim M_{W}$. Here we show that for relatively low neutrino masses, covering the few GeV range, the same-sign to opposite-sign dilepton ratio, $R_{\ell \ell}$, can be anywhere between 0 and 1, thus signaling a Quasi-Dirac regime. Particular values of $R_{\ell \ell}$ are controlled by the width of the QD neutrino and its mass splitting, the latter being equal to the light-neutrino mass $m_{\nu}$ in the LSM scenario. The current upper bound on $m_{\nu_{1}}$ together with the projected sensitivities of current and future $|U_{N \ell}|^{2}$ experimental measurements, set stringent constraints on our low-scale QD mass regime. Some experimental prospects of testing the model by LHC displaced vertex searches are also discussed.