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.

Observation of Ω(2012)−→Ξ(1530)K¯ and measurement of the effective couplings of Ω(2012)− to Ξ(1530)K¯ and ΞK¯ / Jia, S.; Shen, C. P.; Yuan, C. Z.; Ahn, J. K.; Aihara, H.; Asner, D. M.; Atmacan, H.; Ayad, R.; Bahinipati, S.; Banerjee, S.; Bennett, J.; Bessner, M.; Biswas, D.; Bracko, M.; Branchini, P.; Budano, A.; Campajola, M.; Chang, M. -C.; Cheon, B. G.; Cho, H. E.; Choi, S. -K.; Choi, Y.; Choudhury, S.; De Pietro, G.; Dhamija, R.; Di Capua, F.; Dingfelder, J.; Dolezal, Z.; Ecker, P.; Epifanov, D.; Ferber, T.; Ferlewicz, D.; Fulsom, B. G.; Gaur, V.; Garmash, A.; Giri, A.; Goldenzweig, P.; Graziani, E.; Greenwald, D.; Gudkova, K.; Hadjivasiliou, C.; Herrmann, D.; Hou, W. -S.; Ipsita, N.; Ishikawa, A.; Itoh, R.; Iwasaki, M.; Jacobs, W. W.; Jin, Y.; Joo, K. K.; Kiesling, C.; Kim, D. Y.; Kim, K. -H.; Kim, Y. -K.; Kinoshita, K.; Kodys, P.; Korobov, A.; Kovalenko, E.; Krizan, P.; Krokovny, P.; Kumar, R.; Kumara, K.; Kumita, T.; Kwon, Y. -J.; Lam, T.; Li, L. K.; Li, S. X.; Li, Y. B.; Liventsev, D.; Masuda, M.; Matvienko, D.; Maurya, S. K.; Meier, F.; Merola, M.; Mizuk, R.; Mussa, R.; Nakao, M.; Natochii, A.; Niiyama, M.; Nishida, S.; Pakhlov, P.; Pakhlova, G.; Pardi, S.; Park, J.; Pedlar, T. K.; Pestotnik, R.; Piilonen, L. E.; Podobnik, T.; Prencipe, E.; Prim, M. T.; Russo, G.; Sandilya, S.; Schnell, G.; Schwanda, C.; Seino, Y.; Senyo, K.; Shan, W.; Shiu, J. -G.; Sokolov, A.; Solovieva, E.; Staric, M.; Sumihama, M.; Takizawa, M.; Tamponi, U.; Tanida, K.; Tenchini, F.; Unno, Y.; Uno, S.; Urquijo, P.; Usov, Y.; Wang, M. -Z.; Won, E.; Yabsley, B. D.; Yan, W.; Yelton, J.; Yin, J. H.; Yuan, L.; Zhang, Z. P.; Zhilich, V.; Zhukova, V.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 860:(2025). [10.1016/j.physletb.2024.139224]

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

Campajola M.;Di Capua F.;Merola M.;Pardi S.;
2025

Abstract

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.
2025
Observation of Ω(2012)−→Ξ(1530)K¯ and measurement of the effective couplings of Ω(2012)− to Ξ(1530)K¯ and ΞK¯ / Jia, S.; Shen, C. P.; Yuan, C. Z.; Ahn, J. K.; Aihara, H.; Asner, D. M.; Atmacan, H.; Ayad, R.; Bahinipati, S.; Banerjee, S.; Bennett, J.; Bessner, M.; Biswas, D.; Bracko, M.; Branchini, P.; Budano, A.; Campajola, M.; Chang, M. -C.; Cheon, B. G.; Cho, H. E.; Choi, S. -K.; Choi, Y.; Choudhury, S.; De Pietro, G.; Dhamija, R.; Di Capua, F.; Dingfelder, J.; Dolezal, Z.; Ecker, P.; Epifanov, D.; Ferber, T.; Ferlewicz, D.; Fulsom, B. G.; Gaur, V.; Garmash, A.; Giri, A.; Goldenzweig, P.; Graziani, E.; Greenwald, D.; Gudkova, K.; Hadjivasiliou, C.; Herrmann, D.; Hou, W. -S.; Ipsita, N.; Ishikawa, A.; Itoh, R.; Iwasaki, M.; Jacobs, W. W.; Jin, Y.; Joo, K. K.; Kiesling, C.; Kim, D. Y.; Kim, K. -H.; Kim, Y. -K.; Kinoshita, K.; Kodys, P.; Korobov, A.; Kovalenko, E.; Krizan, P.; Krokovny, P.; Kumar, R.; Kumara, K.; Kumita, T.; Kwon, Y. -J.; Lam, T.; Li, L. K.; Li, S. X.; Li, Y. B.; Liventsev, D.; Masuda, M.; Matvienko, D.; Maurya, S. K.; Meier, F.; Merola, M.; Mizuk, R.; Mussa, R.; Nakao, M.; Natochii, A.; Niiyama, M.; Nishida, S.; Pakhlov, P.; Pakhlova, G.; Pardi, S.; Park, J.; Pedlar, T. K.; Pestotnik, R.; Piilonen, L. E.; Podobnik, T.; Prencipe, E.; Prim, M. T.; Russo, G.; Sandilya, S.; Schnell, G.; Schwanda, C.; Seino, Y.; Senyo, K.; Shan, W.; Shiu, J. -G.; Sokolov, A.; Solovieva, E.; Staric, M.; Sumihama, M.; Takizawa, M.; Tamponi, U.; Tanida, K.; Tenchini, F.; Unno, Y.; Uno, S.; Urquijo, P.; Usov, Y.; Wang, M. -Z.; Won, E.; Yabsley, B. D.; Yan, W.; Yelton, J.; Yin, J. H.; Yuan, L.; Zhang, Z. P.; Zhilich, V.; Zhukova, V.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 860:(2025). [10.1016/j.physletb.2024.139224]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/1011942
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