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 MN . MW. Here we show that for relatively low neutrino masses, covering the few GeV range, the samesign to opposite-sign dilepton ratio, R``, can be anywhere between 0 and 1, thus signaling a Quasi-Dirac regime. Particular values of R`` are controlled by the width of the QD neutrino and its mass splitting, the latter being equal to the light-neutrino mass m in the LSM scenario. The current upper bound on m1 together with the projected sensitivities of current and future |UN`|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.