PT Journal
AU Arbelaez, C
   Dib, C
   Monsalvez-Pozo, K
   Schmidt, I
TI Quasi-Dirac neutrinos in the linear seesaw model
SO Journal of High Energy Physics
JI J. High Energy Phys.
PY 2021
BP 154
EP 22pp
VL 07
IS 7
DI 10.1007/JHEP07(2021)154
LA English
DE Beyond Standard Model; Neutrino Physics
AB 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 less than or similar to 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-ll, can be anywhere between 0 and 1, thus signaling a Quasi-Dirac regime. Particular values of R-ll 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 l|(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.
ER