Quasi-Dirac neutrinos in the linear seesaw model

30 Aug 2021, 18:00
1h 30m
Poster Neutrino physics and astrophysics Poster session 1

Speaker

Kevin Monsalvez Pozo (IFIC (CSIC-Univ Valencia))

Description

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, $R_{\ell \ell}$, 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.

Reference to paper (DOI or arXiv) 2104.08023

Primary author

Kevin Monsalvez Pozo (IFIC (CSIC-Univ Valencia))

Co-authors

Carolina Arbelaez (Universidad Tecnica Federico Santa Maria and Centro Cientifico Tecnologico de Valparaiso CCTVal) Claudio Dib (Universidad Tecnica Federico Santa Maria and Centro Cientifico Tecnologico de Valparaiso CCTVal) Ivan Schmidt (Universidad Tecnica Federico Santa Maria and Centro Cientifico Tecnologico de Valparaiso CCTVal)

Presentation Materials

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