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Search for $B^0$ meson decays into $\Lambda$ 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.
  • Bračko, M.
  • Branchini, P.
  • Browder, T.E.
  • Budano, A.
  • Campajola, M.
  • Červenkov, D.
  • Chang, M.-C.
  • Chang, P.
  • Chen, A.
  • Cheon, B.G.
  • Chilikin, K.
  • Cho, H.E.
  • Choi, S.-K.
  • Choi, Y.
  • Choudhury, S.
  • Cinabro, D.
  • Cunliffe, S.
  • Das, S.
  • de Pietro, G.
  • Di Capua, F.
  • Doležal, Z.
  • Dong, T.V.
  • Dossett, D.
  • Epifanov, D.
  • Ferber, T.
  • Garg, R.
  • Gaur, V.
  • Giri, A.
  • Goldenzweig, P.
  • Gu, T.
  • Gudkova, K.
  • Hayashii, H.
  • Hou, W.-S.
  • Hsu, C.-L.
  • Iijima, T.
  • Inami, K.
  • Inguglia, G.
  • Ishikawa, A.
  • Iwasaki, M.
  • Iwasaki, Y.
  • Jacobs, W.W.
  • Jia, S.
  • Jin, Y.
  • Kahn, J.
  • Kaliyar, A.B.
  • Kang, K.H.
  • Karyan, G.
  • Kiesling, C.
  • Kim, C.H.
  • Kim, D.Y.
  • Kim, K.T.
  • Kim, Y.-K.
  • Kodyš, P.
  • Konno, T.
  • Korobov, A.
  • Korpar, S.
  • Kovalenko, E.
  • Križan, P.
  • Kroeger, R.
  • Krokovny, P.
  • Kumar, R.
  • Kumara, K.
  • Kwon, Y.-J.
  • Lee, S.C.
  • Li, L.K.
  • Li, S.X.
  • Li, Y.B.
  • Gioi, L. Li
  • Libby, J.
  • Lieret, K.
  • Macqueen, C.
  • Masuda, M.
  • Matvienko, D.
  • Merola, M.
  • Miyabayashi, K.
  • Mizuk, R.
  • Mohanty, G.B.
  • Mussa, R.
  • Nakao, M.
  • Natkaniec, Z.
  • Natochii, A.
  • Nayak, M.
  • Nisar, N.K.
  • Nishida, S.
  • Nishimura, K.
  • Ono, H.
  • Oskin, P.
  • Pakhlov, P.
  • Pakhlova, G.
  • Pang, T.
  • Park, S.-H.
  • Paul, S.
  • Pedlar, T.K.
  • Piilonen, L.E.
  • Podobnik, T.
  • Popov, V.
  • Prencipe, E.
  • Prim, M.T.
  • Röhrken, M.
  • Rostomyan, A.
  • Rout, N.
  • Russo, G.
  • Sahoo, D.
  • Sandilya, S.
  • Sangal, A.
  • Santelj, L.
  • Sanuki, T.
  • Savinov, V.
  • Schnell, G.
  • Schwanda, C.
  • Seino, Y.
  • Senyo, K.
  • Shapkin, M.
  • Shen, C.P.
  • Shiu, J.-G.
  • Shwartz, B.
  • Simon, F.
  • Singh, J.B.
  • Solovieva, E.
  • Starič, M.
  • Stottler, Z.S.
  • Sumihama, M.
  • Sumiyoshi, T.
  • Takizawa, M.
  • Tanida, K.
  • Tenchini, F.
  • Uchida, M.
  • Uglov, T.
  • Unno, Y.
  • Uno, S.
  • van Tonder, R.
  • Varner, G.
  • Vinokurova, A.
  • Waheed, E.
  • Wang, C.H.
  • Wang, E.
  • Wang, M.-Z.
  • Wang, P.
  • Wang, X.L.
  • Watanuki, S.
  • Wood, L.
  • Yabsley, B.D.
  • Yan, W.
  • Ye, H.
  • Yelton, J.
  • Yin, J.H.
  • Zhang, Z.P.
  • Zhilich, V.
  • Zhukova, V.
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Publication date
January 2022
Icon DOI
10.1103/PhysRevD.105.L051101
Publisher
American Physical Society (APS)

Abstract

International audienceWe 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 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

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