Distinguishing Dirac/Majorana Sterile Neutrinos at the LHC

Abstract

We study the purely leptonic decays of $W^{\pm }\to e^{\pm }{e}^{\pm }{\mu }^{\mp }\nu$ and ${\mu }^{\pm }{\mu }^{\pm }{e}^{\mp }\nu$ produced at the LHC, induced by sterile neutrinos with mass $m_N$ below $M_W$ in the intermediate state. Since the final state neutrino escapes detection, one cannot tell whether this process violates lepton number, what would indicate a Majorana character for the intermediate sterile neutrino. Our study shows that when the sterile neutrino mixings with electrons and muons are different enough, one can still discriminate between the Dirac and Majorana character of this intermediate neutrino by simply counting and comparing the above decay rates. After performing collider simulations and statistical analysis, we find that at the $14\text{TeV}$ LHC with an integrated luminosity of $3000{\text{fb}}^{-1}$, for two benchmark scenarios $m_N$ = 20 GeV and 50 GeV, at least a $3\sigma$ level of exclusion on the Dirac case can be achieved for disparities as mild as e.g. $|U_{Ne}{|}^2<0.7|U_{N\mu }{|}^2$ or $|U_{N\mu }{|}^2<0.7|U_{Ne}{|}^2$, provided that $|U_{Ne}{|}^2$, $|U_{N\mu }{|}^2$ are both above $\sim 2\times 10^{-6}$.

arXiv comment18 pages, 7 figures

References in corpus (31)

• PYTHIA 6.4 Physics and Manual
• PYTHIA 6.2 Physics and Manual
• Big-Bang Nucleosynthesis
• DELPHES 3, A modular framework for fast simulation of a generic collider experiment
• MadGraph 5 : Going Beyond
• Dark Matter Candidates from Particle Physics and Methods of Detection
• UFO - The Universal FeynRules Output
• Leptogenesis
• FeynRules - Feynman rules made easy
• The Search for Heavy Majorana Neutrinos
• Neutrinos and Collider Physics
• QCD radiation in the production of heavy colored particles at the LHC
• Search for heavy Majorana neutrinos with the ATLAS detector in pp collisions at $\sqrt{s}=8$ TeV
• Heavy neutrino searches at the LHC with displaced vertices
• Multilepton and Lepton Jet Probes of Sub-Weak-Scale Right-Handed Neutrinos
• Search for heavy Majorana neutrinos in mu+/- mu+/- + jets events in proton-proton collisions at sqrt(s) = 8 TeV
• Sterile neutrinos in lepton number and lepton flavor violating decays
• Search for anomalous production of events with three or more leptons in pp collisions at sqrt(s) = 8 TeV
• Search for anomalous production of prompt same-sign lepton pairs and pair-produced doubly charged Higgs bosons with $\sqrt{s}=8$ TeV $pp$ collisions using the ATLAS detector
• Probing Majorana neutrinos in rare K and D, D_s, B, B_c meson decays
• Production of Heavy neutrino in next-to-leading order QCD at the LHC and beyond
• Probing Majorana neutrinos in rare pi+ to e+ e+ mu- nu decays
• Discovering sterile Neutrinos ligther than $M_W$ at the LHC
• Search for Lepton-number-violating B+->D-l+l'+ Decays
• Trilepton production at the CERN LHC: Standard model sources and beyond
• Measuring the tth coupling from SSDL+2b measurements
• Search for lepton-number violating processes in B+ -> h- l+ l+ decays
• Search for lepton-number violating B+ -> X- l+ l'+ decays
• Left-Right Symmetric Models at the High-Intensity Frontier
• Isolated leptons from heavy flavor decays: Theory and data
• Missing heavy flavor backgrounds to Higgs boson production

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• Feebly-Interacting Particles:FIPs 2020 Workshop Report
• Sterile neutrino searches at future $e^{-}{e}^{+}$, $pp$, and $e^{-}p$ colliders
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• The Present and Future Status of Heavy Neutral Leptons
• Combining Experimental and Cosmological Constraints on Heavy Neutrinos
• Testing the low scale seesaw and leptogenesis
• Heavy Neutrinos in displaced vertex searches at the LHC and HL-LHC
• Bounds on heavy Majorana neutrinos in type-I seesaw and implications for collider searches
• Probing Leptogenesis
• A frequentist analysis of three right-handed neutrinos with GAMBIT
• Constraining Sterile Neutrinos from Precision Higgs Data
• Majorana Higgses at colliders
• Mapping the viable parameter space for testable leptogenesis
• On Lepton Number Violation in Heavy Neutrino Decays at Colliders
• Heavy Neutrino Search via the Higgs boson at the LHC
• Searching for a Sterile Neutrino in Tau Decays at B-factories
• Rare decays of B mesons via on-shell sterile neutrinos
• Lepton Flavor Violating Dilepton Dijet Signatures from Sterile Neutrinos at Proton Colliders
• Bounds on right-handed neutrino parameters from observable leptogenesis
• Probing the Dirac or Majorana nature of the Heavy Neutrinos in pure leptonic decays at the LHC
• Signatures of Dirac and Majorana Sterile Neutrinos in Trilepton Events at the LHC
• Sensitivity limits on heavy-light mixing $|U_{\mu N}{|}^2$ from lepton number violating $B$ meson decays
• New Benchmark Models for Heavy Neutral Lepton Searches
• Pair production of heavy neutrinos in next-to-leading order QCD at the hadron colliders in the inverse seesaw framework
• Heavy Majorana neutrino pair production from $Z^{\prime }$ at hadron and lepton colliders
• Search for sterile neutrinos decaying into pions at the LHC
• Exploring CP-violation, via heavy neutrino oscillations, in rare B meson decays at Belle II
• Search for Heavy Sterile Neutrinos in Trileptons at the LHC
• Majorana neutrino signals at Belle-II and ILC
• Probing sterile neutrino in $B$ ($D$) meson decays at Belle II (BESIII)
• Search for light sterile neutrinos from $W^{\pm }$ decays at the LHC
• On the Minimal Mixing of Heavy Neutrinos
• Distinguishing Dirac from Majorana Heavy Neutrino at Future Lepton Colliders
• Charged-current non-standard neutrino interactions at the LHC and HL-LHC
• ALPs and HNLs at LHC and Muon Colliders: Uncovering New Couplings and Signals
• Search for heavy Majorana neutrinos in the $\tau$ final state at proton-electron colliders
• Large lepton number violation at colliders: predictions from the minimal linear seesaw mechanism
• Probe the Mixing Parameter $|V_{\tau N}{|}^2$ for Heavy Neutrinos
• Quasi-Dirac neutrinos in the linear seesaw model