Neutrino Masses at LHC: Minimal Lepton Flavour Violation in Type-III See-saw

Abstract

We study the signatures of minimal lepton flavour violation in a simple Type-III see - saw model in which the flavour scale is given by the new fermion triplet mass and it can be naturally light enough to be produced at the LHC. In this model the flavour structure of the lepton number conserving couplings of the triplet fermions to the Standard Model leptons can be reconstructed from the neutrino mass matrix and the smallness of the neutrino mass is associated with a tiny violation of total lepton number. Characteristic signatures of this model include suppressed lepton number violation decays of the triplet fermions, absence of displaced vertices in their decays and predictable lepton flavour composition of the states produced in their decays. We study the observability of these signals in the processes $pp\rightarrow 3\ell + 2j +\Sla{E_T}$ and $pp\to 2\ell +4j$ with $\ell =e$ or $\mu$ taking into account the present low energy data on neutrino physics and the corresponding Standard Model backgrounds. Our results indicate that the new fermionic states can be observed for masses up to 500 GeV depending on the CP violating Majorana phase for an integrated luminosity of 30 fb${}^{-1}$. Moreover, the flavour of the final state leptons in the above processes can shed light on the neutrino mass ordering.

31 pages, 11 Figures, matches published version

References in corpus (11)

• MadGraph 5 : Going Beyond
• Phenomenology with Massive Neutrinos
• Distinguishing seesaw models at LHC with multi-lepton signals
• Low energy effects of neutrino masses
• Unitarity of the Leptonic Mixing Matrix
• Minimal Flavour Seesaw Models
• Electroweak scale seesaw and heavy Dirac neutrino signals at LHC
• Neutrino mass hierarchy and Majorana CP phases within the Higgs triplet model at the LHC
• Renormalizable Adjoint SU(5)
• Various definitions of Minimal Flavour Violation for Leptons
• Minimal flavour violation extensions of the seesaw

Cited by in corpus (21)

• Production of Heavy neutrino in next-to-leading order QCD at the LHC and beyond
• Phenomenology of the Generalised Scotogenic Model with Fermionic Dark Matter
• $(\mathbf{g}-2{)}_{\mathbf{e},\mathbf{\mu }}$ in an extended inverse type-III seesaw
• On the Potential of Leptonic Minimal Flavour Violation
• Probing Exotic Fermions from a Seesaw/Radiative Model at the LHC
• Fermionic dark matter and neutrino masses in a $\mathcal{B}-\mathcal{L}$ model
• Triplet Scalar Dark Matter and Leptogenesis in an Inverse See-Saw Model of Neutrino Mass Generation
• Constraining minimal Type-III Seesaw Model from naturalness, Lepton Flavor Violation and Electroweak Vacuum stability
• Pair production of heavy neutrinos in next-to-leading order QCD at the hadron colliders in the inverse seesaw framework
• Constraints on a seesaw model leading to quasidegenerate neutrinos and signatures at the LHC
• Effective Operator Bases for Beyond Standard Model Scenarios: An EFT compendium for discoveries
• Looking for hints of a reconstructible seesaw model at the Large Hadron Collider
• Probing Higgs in Type III Seesaw at the LHC
• Displaced Higgs production in Type-III Seesaw at the LHC/FCC, MATHUSLA and Muon collider
• Global Bounds on the Type-III Seesaw
• U boson searches at KLOE
• Direct searches of Type III seesaw triplet fermions at high energy $e^{+}{e}^{-}$ collider
• LHC Signatures for Cascade Seesaw Mechanism
• The Two Scales of New Physics in Higgs Couplings
• Seesaw Models under the Lens of Angular Distributions at ${\mu }^{+}{\mu }^{-},{\mu }^{+}{\mu }^{+},{\mu }^{+}\gamma$ and ${\mu }^{+}{e}^{-}$ Colliders
• Riding the Seesaw: What Higgsstrahlung May Reveal about Massive Neutrinos