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Probing dark sectors with long-lived particles at BELLE II

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arxiv 1911.03490 v2 pith:OAXHOCTP submitted 2019-11-08 hep-ph hep-ex

classification hep-phhep-ex
keywords decaysbellelightlong-livedmesonrarescalarscalars
verification ladder T0 review T1 audit T2 compute T3 formal

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abstract

We propose a new search for light scalar singlets in rare meson decays. For tiny interactions, the scalar is long-lived at detector scales and decays into displaced pairs of leptons or light mesons. We show that Belle II has a remarkable potential to probe scalars in the GeV range with couplings as small as $10^{-5}$. The predicted sensitivity is higher than at the long-baseline experiments FASER and NA62. We also investigate signatures of invisibly decaying scalars in rare meson decays with missing energy.

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Cited by 3 Pith papers

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

  1. Radiative generation of chiral vector operators in $b\to s \nu\bar{\nu}$ transition

    hep-ph 2026-01 conditional novelty 6.0 of 10

    Minimal one-loop models that generate both chiral vector operators for b→sνν̄ are systematically classified but cannot quantitatively explain the Belle II anomaly.

  2. Emerging Photon Jets in the Hadronic Calorimeter: A Novel Signature of Neutral Long-Lived Particles at the LHC

    hep-ph 2025-04 reject novelty 6.0 of 10

    A new 'emerging photon jet' signature in the hadronic calorimeter could make neutral long-lived particles decaying to photons visible at the HL-LHC.

  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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