Heavy neutrino signals at large hadron colliders

Abstract

We study the LHC discovery potential for heavy Majorana neutrino singlets in the process pp -> W+ -> l+ N -> l+ l+ jj (l=e,mu) plus its charge conjugate. With a fast detector simulation we show that backgrounds involving two like-sign charged leptons are not negligible and, moreover, they cannot be eliminated with simple sequential kinematical cuts. Using a likelihood analysis it is shown that, for heavy neutrinos coupling only to the muon, LHC has 5 sigma sensitivity for masses up to 200 GeV in the final state mu+- mu+- jj. This reduction in sensitivity, compared to previous parton-level estimates, is driven by the ~ 10^2-10^3 times larger background. Limits are also provided for e+- e+- jj and e+- mu+- jj final states, as well as for Tevatron. For heavy Dirac neutrinos the prospects are worse because backgrounds involving two opposite charge leptons are much larger. For this case, we study the observability of the lepton flavour violating signal e+- mu-+ jj. As a by-product of our analysis, heavy neutrino production has been implemented within the ALPGEN framework.

Latex 36 pages, 49 PS figures. Major extension incorporating analysis for e+- e+-, e+- mu+- and e+- mu-+ final states. Final version to appear in JHEP

References in corpus (6)

• PYTHIA 6.4 Physics and Manual
• Signatures for Majorana neutrinos at hadron colliders
• Resonant CP Violation due to Heavy Neutrinos at the LHC
• Neutrino physics at large colliders
• Neutrinoless double beta decay and direct searches for neutrino mass
• Light Higgs boson discovery from fermion mixing

Cited by in corpus (70)

• 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 Majorana Neutrinos in the Effective Lagrangian Description: Application to Hadron Colliders
• Electric Dipole Moments in the MSSM Reloaded
• The Present and Future Status of Heavy Neutral Leptons
• Type-III see-saw at LHC
• Flavour Covariant Transport Equations: an Application to Resonant Leptogenesis
• A Survey of Lepton Number Violation Via Effective Operators
• Direct Bounds on Electroweak Scale Pseudo-Dirac Neutrinos from $\sqrt{s}=8$ TeV LHC Data
• New Mechanism for Neutrino Mass Generation and Triply Charged Higgs Bosons at the LHC
• Electroweak scale seesaw and heavy Dirac neutrino signals at LHC
• Low Energy Signatures of the TeV Scale See-Saw Mechanism
• Multilepton and Lepton Jet Probes of Sub-Weak-Scale Right-Handed Neutrinos
• 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
• Lepton Flavour Violation and theta(13) in Minimal Resonant Leptogenesis
• Direct determination of neutrino mass parameters at future colliders
• TeV Scale Left-Right Symmetry and Large Mixing Effects in Neutrinoless Double Beta Decay
• Testing non-unitarity of neutrino mixing matrices at neutrino factories
• Lepton Mixing and Cancellation of the Dirac Mass Hierarchy in SO(10) GUTs with Flavor Symmetries T7 and Sigma(81)
• Collider aspects of flavour physics at high Q
• 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
• LHC Phenomenology of Type II Seesaw: Nondegenerate Case
• Is leptogenesis falsifiable at LHC?
• The Little Review on Leptogenesis
• Correlative signatures of heavy Majorana neutrinos and doubly-charged Higgs bosons at the Large Hadron Collider
• Collider limits on leptophilic interactions
• Electroweak Resonant Leptogenesis in the Singlet Majoron Model
• Flavour in heavy neutrino searches at the LHC
• NMSSM and Seesaw Physics at LHC
• Heavy Neutral Leptons at Muon Colliders
• 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
• Phenomenology of the minimal supersymmetric $U(1{)}_{B-L}\times U(1{)}_R$ extension of the standard model
• Lepton number violating four-body tau lepton decays
• The seesaw mechanism at TeV scale in the 3-3-1 model with right-handed neutrinos
• A Compromise between Neutrino Masses and Collider Signatures in the Type-II Seesaw Model
• A complete effective field theory for dark matter
• Collider Searches for Heavy Neutral Leptons: beyond simplified scenarios
• Observable Lepton Number Violation with Predominantly Dirac Nature of Active Neutrinos
• Fourth Family Neutrinos and the Higgs Boson
• Triple seesaw mechanism
• Like-sign dilepton signals from a leptophobic Z' boson
• Phenomenological constraints on minimally coupled exotic lepton triplets
• Looking for hints of a reconstructible seesaw model at the Large Hadron Collider
• Constraints on a seesaw model leading to quasidegenerate neutrinos and signatures at the LHC
• Charged Higgs Boson Effects in the Production and Decay of a Heavy Majorana Neutrino at the LHC
• Phenomenology in Minimal Cascade Seesaw for Neutrino Mass
• Comprehensive Analysis of Charged Lepton Flavour Violation in the Symmetry Protected Type-I Seesaw
• Revisiting Constraints on Fourth Generation Neutrino Masses
• Testing electroweak scale seesaw models at $e^{-}\gamma$ and $\gamma \gamma$ colliders
• Neutrino Masses and A TeV Scale Seesaw Mechanism
• Extra dimensions and Seesaw Neutrinos at the International Linear Collider
• Heavy Neutral Leptons -- Advancing into the PeV domain
• Double seesaw mechanism in a left-right symmetric model with TeV neutrinos
• Higher-spin particles at high-energy colliders
• Inverse see-saw neutrino masses in the Littlest Higgs model with T-parity
• Signatures from an extra-dimensional seesaw model
• Clues on the Majorana scale from scalar resonances at the LHC
• Radiative Symmetry breaking, Cosmic Strings and Observable Gravity Waves in $U(1{)}_R$ symmetric $SU(5)\times U(1{)}_{\chi }$
• Long-lived Sterile Neutrino Searches at Future Muon Colliders
• A possible search for Majorana neutrinos at future lepton colliders
• A New Era of Leptogenesis
• Small Neutrino Masses From Structural cancellation In Left-Right Symmetric Model
• Modular-symmetry-protected seesaw
• Improving heavy Dirac neutrino prospects at future hadron colliders using machine learning
• Exact parametrization of a minimal seesaw model
• Right-handed heavy neutrinos in the littlest Higgs model
• LHC signatures of sterile neutrinos in a minimal radiative extended seesaw framework