BackSearch for B0 meson decays into Λ and missing energy with a hadronic tagging method at Belle
Physical Review D 105 : (2022) // Article ID L051101
Abstract
[EN] 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 fb(-1) data sample that contains 772 x 10(6) B (B) over bar 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 A. 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 x 10(-5). This measurement provides the world's most restrictive limits, with implications for baryogenesis and dark matter production.
Except where otherwise noted, this item's license is described as Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.