Volume 380 - Particles and Nuclei International Conference 2021 (PANIC2021) - Neutrino physics
Quasi-Dirac neutrinos in the linear seesaw model
K.M. Pozo*, C. Arbelaez, C. Dib and I. Schmidt
Full text: pdf
Pre-published on: March 01, 2022
Published on: May 24, 2022
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.
DOI: https://doi.org/10.22323/1.380.0285
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