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Search for $B^0$ meson decays into $\Lambda$ and missing energy with a hadronic tagging method at Belle
- Source :
- Phys. Rev. D 105 (2022) L051101
- Publication Year :
- 2021
-
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.<br />Comment: 8 pages, 4 figures
- Subjects :
- High Energy Physics - Experiment
Subjects
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. D 105 (2022) L051101
- Publication Type :
- Report
- Accession number :
- edsarx.2110.14086
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevD.105.L051101