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

Hadjivasiliou, C.*; 谷田 聖   ; Belle Collaboration*; 他166名*

Hadjivasiliou, C.*; Tanida, Kiyoshi; Belle Collaboration*; 166 of others*

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 $$times$$10$$^{6}$$ $$B$$$$overline{B}$$ 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.

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パーセンタイル:49.26

分野:Astronomy & Astrophysics

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