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

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arxiv 2111.04403 v2 pith:FAORR6QX submitted 2021-11-08 hep-ph hep-ex

classification hep-phhep-ex
keywords bellesterileeffectiveneutrinosdecaydisplaced-vertexfieldlong-lived
verification ladder T0 review T1 audit T2 compute T3 formal
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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.

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Forward citations

Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Heavy neutral leptons from light scalar in fixed target and forward search experiments

    hep-ph 2026-07 conditional novelty 6.0 of 10

    SHiP and FPF@FCC-hh are projected to extend experimental sensitivity to a light scalar mixing with the Higgs and to long-lived heavy neutrinos in a B-L seesaw model, with SHiP strongest for scalar masses around 0.5-1 GeV.

  2. Heavy neutral leptons and top quarks in effective field theory

    hep-ph 2025-01 conditional novelty 6.0 of 10

    Long-lived heavy neutral leptons produced via top-quark effective operators could be probed at the HL-LHC up to new-physics scales around 12 TeV at ATLAS and 4.5 TeV at MATHUSLA or ANUBIS.

  3. Estimating the track-reconstruction efficiency in phenomenological proposals of long-lived-particle searches

    hep-ex 2025-01 conditional novelty 6.0 of 10

    TrackEff estimates Belle II track-reconstruction efficiency by geometrically counting drift-chamber hits, with default thresholds tuned to a Belle II tau-tau tracking efficiency measurement.

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