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., et al.. - 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., et al.. - 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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