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| Home > Publications database > Search for $B^0$ meson decays into $\Lambda$ and missing energy with a hadronic tagging method at Belle |
| Journal Article | PUBDB-2022-06317 |
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2022
Inst.
Melville, NY
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Please use a persistent id in citations: doi:10.1103/PhysRevD.105.L051101 doi:10.3204/PUBDB-2022-06317
Report No.: Belle Preprint 2021-24; KEK Preprint 2021-29; PNNL-SA-167279; arXiv:2110.14086
Abstract: We present a search for the decays of $B^0$ mesons into a final state containing a $Λ$ baryon and missing energy. These results are obtained from a 711 fb$^{-1}$ data sample that contains $772 × 10^6$ $B\bar{B}$ pairs and was collected near the $ϒ(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider. We use events in which one $B$ meson is fully reconstructed in a hadronic decay mode and require the remainder of the event to consist of only a single $Λ$. No evidence for these decays is found, and we set 90% confidence level upper limits on the branching fractions in the range $2.1–3.8 × 10^{-5}$. This measurement provides the world’s most restrictive limits, with implications for baryogenesis and dark matter production.
Keyword(s): electron positron: annihilation ; electron positron: colliding beams ; B: pair production ; B0: decay ; Lambda ; dark matter: production ; BELLE ; missing-energy ; B0: decay modes ; baryogenesis ; B0: branching ratio ; branching ratio: upper limit ; B0: hadronic decay ; KEK-B ; Upsilon(10570): electroproduction ; baryon ; experimental results
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Preprint
Search for $B^0$ meson decays into $\Lambda$ and missing energy with a hadronic tagging method at Belle
[10.3204/PUBDB-2021-05245]
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