Phenomenology of the simplest linear seesaw mechanism

Abstract

The linear seesaw mechanism provides a simple way to generate neutrino masses. In addition to Standard Model particles, it includes quasi-Dirac leptons as neutrino mass mediators, and a leptophilic scalar doublet seeding small neutrino masses. Here we review its associated physics, including restrictions from theory and phenomenology. The model yields potentially detectable $\mu \to e\gamma$ rates as well as distinctive signatures in the production and decay of heavy neutrinos ($N_i$) and the charged Higgs boson ($H^{\pm }$) arising from the second scalar doublet. We have found that production processes such as $e^{+}{e}^{-}\to NN$, $e^{-}\gamma \to N{H}^{-}$ and $e^{+}{e}^{-}\to H^{+}{H}^{-}$ followed by the decay chain $H^{\pm }\to {\ell }_i^{\pm }N$, $N\to {\ell }_j^{\pm }{W}^{\mp }$ leads to striking lepton number violation signatures at high energies which may probe the Majorana nature of neutrinos.

53 pages, 33 figures, 2 tables, Matches published version

References in corpus (21)

• 2020 Global reassessment of the neutrino oscillation picture
• Effects of new leptons in Electroweak Precision Data
• Observing the Dark Scalar Doublet and its Impact on the Standard-Model Higgs Boson at Colliders
• Significant Gamma Lines from Inert Higgs Dark Matter
• The Present and Future Status of Heavy Neutral Leptons
• The low-scale approach to neutrino masses
• Indirect searches for sterile neutrinos at a high-luminosity Z-factory
• Electroweak Precision Fit and New Physics in light of $W$ Boson Mass
• $\mu -e$ conversion in nuclei within the CMSSM seesaw: universality versus non-universality
• Quasi-Dirac neutrinos at the LHC
• Enhancement of h --> gamma gamma in the Two Higgs Doublet Model Type I
• Flavour in heavy neutrino searches at the LHC
• Heavy Neutral Leptons at Muon Colliders
• Master Majorana neutrino mass parametrization
• Heavy neutrinos at future linear e${}^{+}$e${}^{-}$ colliders
• Long-lived heavy neutral leptons with a displaced shower signature at CMS
• Distinguishing Dirac and Majorana Heavy Neutrinos at Lepton Colliders
• Simulating lepton number violation induced by heavy neutrino-antineutrino oscillations at colliders
• Heavy Neutrino-Antineutrino Oscillations in Quantum Field Theory
• Testing electroweak scale seesaw models at $e^{-}\gamma$ and $\gamma \gamma$ colliders
• W-mass Anomaly in the Simplest Linear Seesaw Mechanism

Cited by in corpus (11)

• Predictions from scoto-seesaw with $A_4$ modular symmetry
• Linear seesaw mechanism from dark sector
• Dynamical scoto-seesaw mechanism with gauged $B-L$
• The Type-I Seesaw family
• Leptonic neutral-current probes in a short-distance DUNE-like setup
• Dark matter as the source of neutrino mass: theory overview and experimental prospects
• Search for sub-GeV Scalars in $e^{+}{e}^{-}$ collisions
• $A_5$ symmetry and deviation from Golden Ratio mixing with charged lepton flavor violation
• Holographic origin of $a$-maximization and higher-derivative AdS${}_5$/CFT${}_4$
• Search for Sterile Neutrinos with CUPID-0
• Predictions of the neutrino oscillations parameters