Physics Letters B (Jan 2025)

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

  • 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

Journal volume & issue
Vol. 860
p. 139224

Abstract

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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.

Keywords