We present a search for the decays of B0 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 772×106 BB¯ pairs and was collected near the (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.

Search for B0 meson decays into Λ and missing energy with a hadronic tagging method at Belle / Hadjivasiliou, C., Fulsom, B.G., Strube, J.F., Adachi, I., Aihara, H., Asner, D.M., Atmacan, H., Aushev, T., Babu, V., Belous, K., Bennett, J., Bessner, M., Bhardwaj, V., Bhuyan, B., Bilka, T., Biswal, J., Bodrov, D., Borah, J., Bozek, A., Bracko, M., et al.. - In: PHYSICAL REVIEW D. - ISSN 2470-0010. - 105:5(2022). [10.1103/PhysRevD.105.L051101]

Search for B0 meson decays into Λ and missing energy with a hadronic tagging method at Belle

Campajola M.;Di Capua F.;Merola M.;Russo Guido;
2022

Abstract

We present a search for the decays of B0 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 772×106 BB¯ pairs and was collected near the (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.
2022
Search for B0 meson decays into Λ and missing energy with a hadronic tagging method at Belle / Hadjivasiliou, C., Fulsom, B.G., Strube, J.F., Adachi, I., Aihara, H., Asner, D.M., Atmacan, H., Aushev, T., Babu, V., Belous, K., Bennett, J., Bessner, M., Bhardwaj, V., Bhuyan, B., Bilka, T., Biswal, J., Bodrov, D., Borah, J., Bozek, A., Bracko, M., et al.. - In: PHYSICAL REVIEW D. - ISSN 2470-0010. - 105:5(2022). [10.1103/PhysRevD.105.L051101]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/968973
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