Search for Heavy Sterile Neutrinos in Trileptons at the LHC

Abstract

We present a search strategy for both Dirac and Majorana sterile neutrinos from the purely leptonic decays of $W^{\pm }\to e^{\pm }{e}^{\pm }{\mu }^{\mp }\nu$ and ${\mu }^{\pm }{\mu }^{\pm }{e}^{\mp }\nu$ at the 14 TeV LHC. The discovery and exclusion limits for sterile neutrinos are shown using both the Cut-and-Count (CC) and Multi-Variate Analysis (MVA) methods. We also discriminate between Dirac and Majorana sterile neutrinos by exploiting a set of kinematic observables which differ between the Dirac and Majorana cases. We find that the MVA method, compared to the more common CC method, can greatly enhance the discovery and discrimination limits. Two benchmark points with sterile neutrino mass $m_N=20$ GeV and 50 GeV are tested. For an integrated luminosity of 3000 ${\mathrm{fb}}^{-1}$, sterile neutrinos can be found with $5\sigma$ significance if heavy-to-light neutrino mixings $|U_{Ne}{|}^2\sim |U_{N\mu }{|}^2\sim 10^{-6}$, while Majorana vs. Dirac discrimination can be reached if at least one of the mixings is of order $10^{-5}$.

4 pages, 6 figures. arXiv admin note: substantial text overlap with arXiv:1703.01934

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• Multilepton and Lepton Jet Probes of Sub-Weak-Scale Right-Handed Neutrinos
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• Quasi-Dirac neutrinos at the LHC
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• 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
• Probing sterile neutrino in $B$ ($D$) meson decays at Belle II (BESIII)
• Search for light sterile neutrinos from $W^{\pm }$ decays at the LHC
• Probing the Light Sterile Neutrino Through the Heavy Charged Higgs Decay on the LHC
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• Inverse seesaw mechanism with compact supersymmetry: enhanced naturalness and light super-partners
• Quasi-Dirac neutrinos in the linear seesaw model
• Probe the Mixing Parameter $|V_{\tau N}{|}^2$ for Heavy Neutrinos