Probing Heavier-Baryon Oscillations through Light-Baryon Mixing
Abstract
Motivated by the existing direct limits on Ξb0 and Ξc0 oscillations, we investigate how Standard Model weak interactions connect baryon-number-violating mixing in heavy neutral baryons to the much more strongly constrained neutron-antineutron and Λ−Λ̅ mixing. We focus on Ξb0, Λb0, Ξc0, and Ωc0 oscillations and derive indirect constraints on their mass-mixing parameters from existing limits on n−n̅ oscillations and on Λ−Λ̅ mixing, the latter inferred from dinucleon-decay searches. The weak baryon-to-baryon transition amplitudes are estimated by saturating the relevant hadronic correlators with low-lying intermediate baryons. The required weak vertices are modelled using semileptonic form factors from lattice QCD, quark models, and QCD sum rules. Since these form factors must be continued outside their physical semileptonic domains and the resulting loop integrals depend on a UV cutoff, our results are order-of-magnitude estimates subject to sizeable hadronic uncertainties. For a benchmark cutoff of 10 GeV, the indirect bounds on the Ξb0 and Ξc0 mixing parameters are roughly three and five orders of magnitude stronger than the direct LHCb and Belle limits, indicating that light-baryon |ΔB|=2 searches can probe heavy-baryon oscillations far beyond present direct sensitivities.
Related
- Probing LZ-Motivated TeV Higgsino Dark Matter through Heavier Sparticles at LHC
- Probing hairy Kerr black holes through quasi-periodic oscillations II: a study based on the resonance models
- Non-monotonicity of pT correlations from meson-baryon mixing
- Joint Constraints on the Hubble Constant and Cosmic Baryon Density from Localized Fast Radio Bursts and DESI DR2 Baryon Acoustic Oscillations
- Angular Baryon Acoustic Oscillations with DESI DR1
BibTeX
@misc{beneito2026probing,
title = {{Probing Heavier-Baryon Oscillations through Light-Baryon Mixing}},
author = {Arnau Bas i Beneito and Svjetlana Fajfer and Alexey A. Petrov},
howpublished = {arXiv},
year = {2026},
month = nov,
doi = {10.48550/arxiv.2611.05465},
eprint = {2611.05465},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2611.05465},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Probing Heavier-Baryon Oscillations through Light-Baryon Mixing
AU - Arnau Bas i Beneito
AU - Svjetlana Fajfer
AU - Alexey A. Petrov
PY - 2026
DA - 2026/11/03
PB - arXiv
DO - 10.48550/arxiv.2611.05465
UR - https://arxiv.org/abs/2611.05465
AB - Motivated by the existing direct limits on Ξ_b^0 and Ξ_c^0 oscillations, we investigate how Standard Model weak interactions connect baryon-number-violating mixing in heavy neutral baryons to the much more strongly constrained neutron-antineutron and Λ−Λ̅ mixing. We focus on Ξ_b^0, Λ_b^0, Ξ_c^0, and Ω_c^0 oscillations and derive indirect constraints on their mass-mixing parameters from existing limits on n−n̅ oscillations and on Λ−Λ̅ mixing, the latter inferred from dinucleon-decay searches. The weak baryon-to-baryon transition amplitudes are estimated by saturating the relevant hadronic correlators with low-lying intermediate baryons. The required weak vertices are modelled using semileptonic form factors from lattice QCD, quark models, and QCD sum rules. Since these form factors must be continued outside their physical semileptonic domains and the resulting loop integrals depend on a UV cutoff, our results are order-of-magnitude estimates subject to sizeable hadronic uncertainties. For a benchmark cutoff of 10 GeV, the indirect bounds on the Ξ_b^0 and Ξ_c^0 mixing parameters are roughly three and five orders of magnitude stronger than the direct LHCb and Belle limits, indicating that light-baryon |ΔB|=2 searches can probe heavy-baryon oscillations far beyond present direct sensitivities.
ER -