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| Preprint | PUBDB-2021-05245 |
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2021
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Please use a persistent id in citations: doi:10.3204/PUBDB-2021-05245
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 $\Lambda$ baryon and missing energy. These results are obtained from a $711\text{fb}^{-1}$ data sample that contains $772 \times 10^6$ $B{\kern 0.18em}\overline{\kern -0.18em B}$ pairs and was collected near the $\Upsilon(4S)$ 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 $\Lambda$. No evidence for these decays is found and we set $90\%$ confidence level upper limits on the branching fractions in the range $2.1$-$3.8\times 10^{-5}$. 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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Journal Article
Search for $B^0$ meson decays into $\Lambda$ and missing energy with a hadronic tagging method at Belle
Physical review / D 105(5), L051101 (2022) [10.1103/PhysRevD.105.L051101]
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