Abstract
We look into the newly observed Omega (2012) state from the molecular perspective in which the resonance is generated from the bar{K} Xi ^*, eta Omega and bar{K} Xi channels. We find that this picture provides a natural explanation of the properties of the Omega (2012) state. We stress that the molecular nature of the resonance is revealed with a large coupling of the Omega (2012) to the bar{K} Xi ^* channel, that can be observed in the Omega (2012) rightarrow bar{K} pi Xi decay which is incorporated automatically in our chiral unitary approach via the use of the spectral function of Xi ^* in the evaluation of the bar{K} Xi ^* loop function.
Highlights
The recent observation of an excited Ω state, Ω∗, by the Belle collaboration in the K−Ξ and KS0 Ξ− decay channels [1] has stirred a new wave of theoretical papers aiming at explaining the nature of the state and its decay channels
Extensions of quark models which would accommodate five quark components [12,13,14] lead to more binding than the original ones of Refs. [2, 3]. Another extension of the quark model is done in Ref. [15] using the chiral quark model
We investigate the state from the molecular point of view with coupled channels and a chiral unitary approach
Summary
The recent observation of an excited Ω state, Ω∗, by the Belle collaboration in the K−Ξ and KS0 Ξ− decay channels [1] has stirred a new wave of theoretical papers aiming at explaining the nature of the state and its decay channels. We investigate the state from the molecular point of view with coupled channels and a chiral unitary approach Work along these lines was done in Refs. The other output of the approach is that, given the sensitivity of the model to the input due to the zero diagonal transition matrix elements of the interaction, the inclusion of the K Ξ channel into the coupled channels has some effect, producing a shift in the position of the pole ( small) and some diversion in the couplings from the perturbative approach to Ω∗ → K Ξ done in Refs. Another new output of the work is the determination of the wave function at the origin for the K Ξ∗ and ηΩ channels that comes to support the dominance of the K Ξ∗ component in the molecular wave function of the Ω∗ With these differences with respect to the former models, our approach comes to support the conclusions of Refs. With these differences with respect to the former models, our approach comes to support the conclusions of Refs. [20,21,22] as to the natural interpretation of the recent Ω(2012) state in terms of a dynamically generated resonance from the K Ξ∗, ηΩ and K Ξ channels, with the largest overlap to the K Ξ∗ channel
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