Open AccessQuasi-Dirac neutrinos in the linear seesaw model
Author(s) -
Carolina Arbeláez,
Claudio O. Dib,
Kevin Monsálvez-Pozo,
Ivàn Schmidt
Publication year - 2021
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/2156/1/012220
Subject(s) - seesaw molecular geometry , neutrino , physics , particle physics , dirac (video compression format) , sign (mathematics) , large hadron collider , vertex (graph theory) , sterile neutrino , upper and lower bounds , range (aeronautics) , neutrino oscillation , mathematical analysis , graph , materials science , mathematics , discrete mathematics , composite material
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 ≲ M W . Here we show that for relatively low neutrino masses, covering the few GeV range, the same-sign to opposite-sign dilepton ratio, Rℓ , can be anywhere between 0 and 1, thus signaling a Quasi-Dirac regime. Particular values of Rℓ are controlled by the width of the QD neutrino and its mass splitting, the latter being equal to the light-neutrino mass m υ in the LSM scenario. The current upper bound on m υ 1 together with the projected sensitivities of current and future | U Nℓ | 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.