Flavoured searches for type-III seesaw at the LHC

Abstract

We present a reinterpretation of CMS searches for type-III seesaw lepton triplets at the LHC, both for the normal and the inverse seesaw. We find that, in contrast with previous expectations, these searches in the trilepton final state have a good sensitivity to triplets with predominant coupling to the tau lepton. We also show that the limits resulting from direct searches can be neatly presented for arbitrary masses and general flavour mixings. Thus, it turns out that the common (and often unrealistic) simplifying assumptions about the flavour couplings of the triplets used by experimental collaborations to present their results are unnecessary and should be dropped.

LaTeX 6 pages. New simulations, comments and references added. Version to appear in PRD

References in corpus (21)

• PYTHIA 6.4 Physics and Manual
• Right-Handed Neutrinos at LHC and the Mechanism of Neutrino Mass Generation
• Distinguishing seesaw models at LHC with multi-lepton signals
• Neutrino Masses and the LHC: Testing Type II Seesaw
• Effects of new leptons in Electroweak Precision Data
• Heavy neutrino signals at large hadron colliders
• Type-III see-saw at LHC
• Probing seesaw at LHC
• Electroweak scale seesaw and heavy Dirac neutrino signals at LHC
• Probing Majorana Phases and Neutrino Mass Spectrum in the Higgs Triplet Model at the LHC
• Search for heavy neutrinos and right-handed W bosons in events with two leptons and jets in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector
• Testability of Type I Seesaw at the CERN LHC: Revealing the Existence of the B-L Symmetry
• Signatures for right-handed neutrinos at the Large Hadron Collider
• Leptonic signatures of doubly charged Higgs boson production at the LHC
• Upper Bound on the Mass of the Type III Seesaw Triplet in an SU(5) Model
• Testing a Neutrino Mass Generation Mechanism at the Large Hadron Collider
• Search for heavy Majorana neutrinos in mu+mu+[mu-mu-]+jets and e+e+[e-e-]+jets events in pp collisions at sqrt(s) = 7 TeV
• Flavour in heavy neutrino searches at the LHC
• Search for heavy lepton partners of neutrinos in proton-proton collisions in the context of the type III seesaw mechanism
• Measuring heavy neutrino couplings at the LHC
• Like-sign dilepton signals from a leptophobic Z' boson

Cited by in corpus (11)

• $(\mathbf{g}-2{)}_{\mathbf{e},\mathbf{\mu }}$ in an extended inverse type-III seesaw
• Bounds on the triplet fermions in type-III seesaw and implications for collider searches
• A closer look at the possible CMS signal of a new gauge boson
• Radiative Type III Seesaw Model and its collider phenomenology
• 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
• Testing electroweak scale seesaw models at $e^{-}\gamma$ and $\gamma \gamma$ colliders
• Distinguishing Leptoquarks at the LHC/FCC
• Bottom-tau unification by neutrinos in a nonsupersymmetric SU(5) model
• Probing heavy triplet leptons of the type-III seesaw mechanism at future muon colliders
• Lepton flavor violation beyond the MSSM