Long-lived light neutralinos at Belle II

Abstract

We consider light neutralinos of mass about 1 GeV, produced from $\tau$ lepton rare decays at Belle II, in the context of R-parity-violating (RPV) supersymmetry. With large and clean samples of $\tau$ leptons produced at the Belle II experiment, excellent sensitivity to such light neutralinos with the exotic signatures of displaced vertices is expected. We focus on two benchmark scenarios of single RPV operators, ${\lambda }_{311}^{\prime }{L}_3{Q}_1{\bar{D}}_1$ and ${\lambda }_{312}^{\prime }{L}_3{Q}_1{\bar{D}}_2$, which induce both the production and decay of the lightest neutralino. For the reconstruction of a displaced vertex, we require at least two charged pions in the final states. We perform Monte-Carlo simulations for both signal and background events, and find that Belle II can explore regions in the parameter space competitive with other probes. In particular, for the ${\lambda }_{311}^{\prime }$ scenario, it can put limits up to two orders of magnitude stronger than the current bounds.

arXiv commentv1, 15 pages plus appendices, 6 figures, 3 tables; v2, minor changes, matched with the published version

References in corpus (47)

• PYTHIA 6.4 Physics and Manual
• PYTHIA 6.2 Physics and Manual
• A Brief Introduction to PYTHIA 8.1
• The BABAR Detector
• R-parity violating supersymmetry
• Long-Lived Particles at the Energy Frontier: The MATHUSLA Physics Case
• Precision Tau Physics
• Probing a Secluded U(1) at B-factories
• Revised constraints and Belle II sensitivity for visible and invisible axion-like particles
• Light Relic Neutralinos
• Mass Bounds on a Very Light Neutralino
• Supersymmetric Dark Matter - How Light Can the LSP Be?
• Collider Searches for Long-Lived Particles Beyond the Standard Model
• Heavy neutral fermions at the high-luminosity LHC
• Relativistic treatment of the decay constants of light and heavy mesons
• Hadronic Charmed Meson Decays Involving Axial Vector Mesons
• Killing the cMSSM softly
• Supernovae and Light Neutralinos: SN1987A Bounds on Supersymmetry Revisited
• Can neutralinos in the MSSM and NMSSM scenarios still be light?
• Probing dark sectors with long-lived particles at BELLE II
• Bounds on R-parity violating supersymmetric couplings from leptonic and semi-leptonic meson decays
• White Dwarfs constrain Dark Forces
• Invisible and displaced dark matter signatures at Belle II
• Long-Lived Fermions at AL3X
• A supersymmetric solution to the KARMEN time anomaly
• Probing leptogenesis with GeV-scale sterile neutrinos at LHCb and BELLE II
• Lower limit on the neutralino mass in the general MSSM
• LHC constraints on light neutralino dark matter in the MSSM
• R-parity Violation and Light Neutralinos at CODEX-b, FASER, and MATHUSLA
• Cornering light Neutralino Dark Matter at the LHC
• Phenomenology of light neutralinos in view of recent results at the CERN Large Hadron Collider
• Hunting the lightest lightest neutralinos
• Rare meson decays into very light neutralinos
• Describing a1 and b1 decays
• Searching for a Sterile Neutrino in Tau Decays at B-factories
• Physics with Far Detectors at Future Lepton Colliders
• What is the discrete gauge symmetry of the R-parity violating MSSM?
• Implications of a Massless Neutralino for Neutrino Physics
• R-Parity Violation and Light Neutralinos at SHiP and the LHC
• Estimate of the branching fraction ${\tau }^{-}\to \eta {\pi }^{-}{\nu }_{\tau }$, the $a_0^{-}(980)$, and non-standard weak interactions
• Gravitino cosmology with a very light neutralino
• A Supersymmetric Resolution of the KARMEN Anomaly
• Radiative Corrections to the Decay $\tau \to \pi {\nu }_{\tau }$
• Long-lived light neutralinos at future $Z-$factories
• Estimate of the Branching Fraction of tau --> pi eta' nu_tau
• Track Finding Efficiency in BaBar
• Constraining R-parity-violating couplings in $\tau$-processes at the LHC and in electroweak precision measurements

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