Observation of Ω(2012)−→Ξ(1530)K¯ and measurement of the effective couplings of Ω(2012)− to Ξ(1530)K¯ and ΞK¯

Observation of Ω(2012)−→Ξ(1530)K¯ and measurement of the effective couplings of Ω(2012)− to Ξ(1530)K¯ and ΞK¯

Using ϒ(1S), ϒ(2S), and ϒ(3S) data collected by the Belle detector, we discover a new three-body decay, Ω(2012)−→Ξ(1530)K¯→ΞπK¯, with a significance of 5.2 σ. The mass of the Ω(2012)− is (2012.5±0.7±0.5) MeV and its effective couplings to Ξ(1530)K¯ and ΞK¯ are (39−39+31±9)×10−2 and (1.7±0.3±0.3)×10−...

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Main Authors: S. Jia, C.P. Shen, C.Z. Yuan, J.K. Ahn, H. Aihara, D.M. Asner, H. Atmacan, R. Ayad, S. Bahinipati, Sw. Banerjee, J. Bennett, M. Bessner, D. Biswas, M. Bračko, P. Branchini, A. Budano, M. Campajola, M.-C. Chang, B.G. Cheon, H.E. Cho, S.-K. Choi, Y. Choi, S. Choudhury, G. De Pietro, R. Dhamija, F. Di Capua, J. Dingfelder, Z. Doležal, P. Ecker, D. Epifanov, T. Ferber, D. Ferlewicz, B.G. Fulsom, V. Gaur, A. Garmash, A. Giri, P. Goldenzweig, E. Graziani, D. Greenwald, K. Gudkova, C. Hadjivasiliou, D. Herrmann, W.-S. Hou, N. Ipsita, A. Ishikawa, R. Itoh, M. Iwasaki, W.W. Jacobs, Y. Jin, K.K. Joo, C. Kiesling, D.Y. Kim, K.-H. Kim, Y.-K. Kim, K. Kinoshita, P. Kodyš, A. Korobov, E. Kovalenko, P. Križan, P. Krokovny, R. Kumar, K. Kumara, T. Kumita, Y.-J. Kwon, T. Lam, L.K. Li, S.X. Li, Y.B. Li, D. Liventsev, M. Masuda, D. Matvienko, S.K. Maurya, F. Meier, M. Merola, R. Mizuk, R. Mussa, M. Nakao, A. Natochii, M. Niiyama, S. Nishida, P. Pakhlov, G. Pakhlova, S. Pardi, J. Park, T.K. Pedlar, R. Pestotnik, L.E. Piilonen, T. Podobnik, E. Prencipe, M.T. Prim, G. Russo, S. Sandilya, G. Schnell, C. Schwanda, Y. Seino, K. Senyo, W. Shan, J.-G. Shiu, A. Sokolov, E. Solovieva, M. Starič, M. Sumihama, M. Takizawa, U. Tamponi, K. Tanida, F. Tenchini, Y. Unno, S. Uno, P. Urquijo, Y. Usov, M.-Z. Wang, E. Won, B.D. Yabsley, W. Yan, J. Yelton, J.H. Yin, L. Yuan, Z.P. Zhang, V. Zhilich, V. Zhukova
Format: Article
Language:English
Published: Elsevier 2025-01-01
Series:Physics Letters B
Subjects:
Ω(2012)−
Branching fraction ratio
ϒ decays
Belle experiment
Online Access:http://www.sciencedirect.com/science/article/pii/S0370269324007822
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Summary:Using ϒ(1S), ϒ(2S), and ϒ(3S) data collected by the Belle detector, we discover a new three-body decay, Ω(2012)−→Ξ(1530)K¯→ΞπK¯, with a significance of 5.2 σ. The mass of the Ω(2012)− is (2012.5±0.7±0.5) MeV and its effective couplings to Ξ(1530)K¯ and ΞK¯ are (39−39+31±9)×10−2 and (1.7±0.3±0.3)×10−2, where the first uncertainties are statistical and the second are systematic. The ratio of the branching fraction for the three-body decay to that for the two-body decay to ΞK¯ is 0.99±0.26±0.06, assuming isospin symmetry.
ISSN:0370-2693

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