Search for $B^0$ meson decays into $\Lambda$ and missing energy with a hadronic tagging method at Belle

Le résumé fourni par la source

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.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.