Strong decay modes K¯Ξ and K¯Ξπ of the

Y. Huang

¹

,

Mingzhu Liu

²

,

Jun-Xu Lu

³

et al.

Abstract

We study theKΞ decay mode of the newly observed Ωð2012Þ assuming that the Ωð2012Þ is a dynamically generated state with spin parity J P ¼ 3=2 − from the coupled channel S-wave interactions of KΞð1530Þ and ηΩ. In addition, we calculate its three-body decay width into KπΞ. It is shown that the so-obtained total decay width is in fair agreement with the experimental data. We compare our results with those of other recent studies and highlight the differences among them.

Search for Ω(2012)→KΞ(1530)→<

“…The candidate signal region for the Ξð1530Þ coincides with the predicted mass interval from Ref. [9].…”

“…[7], the decay Ωð2012Þ → KπΞ is predicted to dominate over Ωð2012Þ → KΞ, while in Refs. [8][9][10], the production rates of the Ωð2012Þ are almost similar in KπΞ and KΞ decay channels. The authors in Ref.…”

“…The observed spacing in the Ω mass spectrum between the ground state and this excited state (∼340 MeV=c 2 ) is smaller than that for other Ω − excited states [2], and is more similar to the negative-parity orbital excitations of many other baryon pairs such as Λ and Λð1405Þ or Λ þ c and Λ þ c ð2595Þ. After the initial observation of the Ωð2012Þ, several theoretical interpretations of that state were offered [3][4][5][6][7][8][9][10][11]. Although it is generally accepted that Ωð2012Þ is a 1P orbital excitation of the ground-state Ω baryon with quark content sss and quantum numbers J P ¼ 3 2 − , Refs.…”

“…Although it is generally accepted that Ωð2012Þ is a 1P orbital excitation of the ground-state Ω baryon with quark content sss and quantum numbers J P ¼ 3 2 − , Refs. [7][8][9][10] propose an alternative interpretation as a KΞð1530Þ hadronic molecule. These models predict a large decay width for Ωð2012Þ → KπΞ.…”

Newly observed Ω(2012) state and strong decays of the low-lying Ω excitations

“…Furthermore, the mass and strong decay patten of Ωð2012Þ also were studied by QCD sum rule [18,19]. As its mass is very close to Ξð1530ÞK threshold, there is also some work that considered it as a J P ¼ 3=2 − KΞ Ã molecular state [20][21][22], or a dynamically generated state [23]. In Ref.…”