Heavy lepton pair production at LHC: model discrimination with multi-lepton signals

Abstract

If new leptons exist close to the electroweak scale, they can be produced in pairs at LHC through standard or new interactions. We study the production of heavy lepton pairs in SM extensions with: (i) a Majorana or Dirac lepton triplet, as those appearing in type-III seesaw; (ii) a lepton isodoublet (N,E)_{L,R}; (iii) a charged isosinglet E_{L,R}; (iv) a Majorana or Dirac neutrino singlet N and an additional Z' gauge boson. It is shown that the trilepton final state l+-l+-l-+, which has a small SM background, constitutes the golden channel for heavy neutrino searches, being very sensitive to Majorana or Dirac neutrinos in triplet, doublet or singlet SU(2)_L representations. For higher luminosities, signals in this final state can also distinguish lepton triplets from doublets and singlets. The Majorana or Dirac nature of the heavy neutrinos is revealed by the presence or not of like-sign dilepton l+-l+- signals without significant missing energy. Notably, l+-l+- signals but with large missing energy are characteristic of Dirac triplets, distinguishing them from the other two models with a heavy Dirac neutrino. Further discrimination is achieved with the analysis of the clean l+l+l-l- final state.

LaTeX 38 pages, 28 PS figures. Added cross section plots, comments and references. Final version to appear in NPB

References in corpus (16)

• PYTHIA 6.4 Physics and Manual
• Distinguishing seesaw models at LHC with multi-lepton signals
• Effects of new leptons in Electroweak Precision Data
• Identifying top partners at LHC
• Heavy neutrino signals at large hadron colliders
• Type-III see-saw at LHC
• Pair Production of Doubly-Charged Scalars: Neutrino Mass Constraints and Signals at the LHC
• Electroweak scale seesaw and heavy Dirac neutrino signals at LHC
• Signatures for right-handed neutrinos at the Large Hadron Collider
• Radiative Inverse Seesaw: Verifiable New Mechanism of Neutrino Mass
• Testing neutrino masses in little Higgs models via discovery of doubly charged Higgs at LHC
• Testing a Neutrino Mass Generation Mechanism at the Large Hadron Collider
• Trilepton production at the CERN LHC: Standard model sources and beyond
• Natural fourth generation of leptons
• Like-sign dilepton signals from a leptophobic Z' boson
• Charged Higgs Boson Effects in the Production and Decay of a Heavy Majorana Neutrino at the LHC

Cited by in corpus (44)

• Identifying top partners at LHC
• The minimal B-L model naturally realized at TeV scale
• Vector-like leptons: Higgs decays and collider phenomenology
• Baryon and Lepton Number as Local Gauge Symmetries
• Breaking Local Baryon and Lepton Number at the TeV Scale
• TeV-scale Seesaw with Quintuplet Fermions
• A Little Solution to the Little Hierarchy Problem: A Vector-like Generation
• Collider Signatures for Heavy Lepton Triplet in Type I+III Seesaw
• Neutrino Masses from an A4 Symmetry in Holographic Composite Higgs Models
• Production of Heavy neutrino in next-to-leading order QCD at the LHC and beyond
• Effective Lagrangian approach to neutrinoless double beta decay and neutrino masses
• Combining searches of Z' and W' bosons
• New Avenues to Heavy Right-handed Neutrinos with Pair Production at Hadronic Colliders
• Flavour in heavy neutrino searches at the LHC
• Review of searches for vector-like quarks, vector-like leptons, and heavy neutral leptons in proton-proton collisions at $\sqrt{s}$ = 13 TeV at the CMS experiment
• Exotic Seesaw-Motivated Heavy Leptons at the LHC
• Phenomenology of the minimal supersymmetric $U(1{)}_{B-L}\times U(1{)}_R$ extension of the standard model
• Jet substructure shedding light on heavy Majorana neutrinos at the LHC
• Search for type-III Seesaw heavy leptons in $pp$ collisions at $\sqrt{s}=8$ TeV with the ATLAS Detector
• Right-handed Sneutrino Dark Matter in Supersymmetric B-L Model
• QCD Corrections to Pair Production of Type III Seesaw Leptons at Hadron Colliders
• Measuring heavy neutrino couplings at the LHC
• A closer look at the possible CMS signal of a new gauge boson
• Future Collider Signatures of the Possible 750 GeV State
• Heavy Neutrinos and Lepton Number Violation in lp Colliders
• Next-to-Leading Order Cross Sections for New Heavy Fermion Production at Hadron Colliders
• Inverse Seesaw Neutrino Mass from Lepton Triplets in the U(1)_Sigma Model
• Lepton Number Violation: Seesaw Models and Their Collider Tests
• Heavy neutrinos, Z' and Higgs bosons at the LHC: new particles from an old symmetry
• Lepton Number Violation from Colored States at the LHC
• Flavoured searches for type-III seesaw at the LHC
• Spontaneous Twin Symmetry Breaking
• The LSP Stability and New Higgs Signals at the LHC
• Phase Transitions and Baryogenesis From Decays
• Combined analysis of Z' -> t tbar and Z' -> t tbar j production for vector resonance searches at LHC
• Search for a light $Z^{\prime }$ at LHC in a neutrinophilic $U(1)$ model
• Dark Matter and The Seesaw Scale
• The Two Scales of New Physics in Higgs Couplings
• Probing heavy triplet leptons of the type-III seesaw mechanism at future muon colliders
• Testing minimal lepton flavor violation with extra vector-like leptons at the LHC
• Neutrinoless double $\beta$ decay with small neutrino masses
• Study of Gauged Lepton Symmetry Signatures at Colliders
• Neutrino physics beyond neutrino masses
• A simple symmetry as a guide toward new physics beyond the Standard Model