Long-lived Sterile Neutrinos at Belle II in Effective Field Theory

Abstract

Large numbers of $\tau$ leptons are produced at Belle II. These could potentially decay into sterile neutrinos that, for the mass range under consideration, are typically long-lived, leading to displaced-vertex signatures. Here, we study a displaced-vertex search sterile-neutrino-extended Standard Model Effective Field Theory. The production and decay of the sterile neutrinos can be realized via either the standard active-sterile neutrino mixing or higher-dimensional operators in the effective Lagrangian. We perform Monte-Carlo simulations to estimate the Belle II sensitivities to such interactions. We find that Belle II can probe non-renormalizable dimension-six operators involving a single sterile neutrino up to a few TeV in the new-physics scale.

v1: 14 pages + Appendix, 8 figures, 4 tables, v2: 15 pages+appendix, 9 figures, 4 tables, published in JHEP

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Cited by in corpus (18)

• Effective portals to heavy neutral leptons
• When Energy Goes Missing: New Physics in $b\to s\nu \nu$ with Sterile Neutrinos
• Probing right-handed neutrinos dipole operators
• Long-lived heavy neutral leptons at the LHC: four-fermion single-$N_R$ operators
• Assessment of the Dimension-5 Seesaw Portal and Impact of Exotic Higgs Decays on Non-Pointing Photon Searches
• Long-lived heavy neutral leptons from mesons in effective field theory
• Long-lived neutral fermions at the DUNE near detector
• Testing Neutrino Dipole Portal by Long-lived Particle Detectors at the LHC
• Light sterile neutrinos and lepton-number-violating kaon decays in effective field theory
• Illuminating the dark: mono-$\gamma$ signals at NA62
• Probing light sterile neutrinos in left-right symmetric models with displaced vertices and neutrinoless double beta decay
• Right-handed Dirac and Majorana neutrinos at Belle II
• Sensitivity prospects for lepton-trijet signals in the $\nu$SMEFT at the LHeC
• Search for heavy Majorana neutrinos in the $\tau$ final state at proton-electron colliders
• Probe the Mixing Parameter $|V_{\tau N}{|}^2$ for Heavy Neutrinos
• Right handed neutrino production from $Z^{\prime }$ interactions in forward search experiments
• Future collider sensitivities to $\nu$SMEFT interactions
• Charged Lepton Flavor Violation at the High-Energy Colliders: Neutrino Mass Relevant Particles