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Paper   IPM / Physic / 15198
School of Physics
  Title:   Analysis of the structure of Ξ(1690) through its decays
  Author(s): 
1.  T.M. Aliev
2.  K. Azizi
3.  H. Sundu
  Status:   Published
  Journal: Eur. Phys. J. C
  Vol.:  78
  Year:  2018
  Pages:   396
  Supported by:  IPM
  Abstract:
The mass and pole residue of the first orbitally and radially excited Ξ state as well as the ground state residue are calculated by means of the two-point QCD sum rules. Using the obtained results for the spectroscopic parameters, the strong coupling constants relevant to the decays Ξ(1690)→ ΣK and Ξ(1690) → ΛK are calculated within the light-cone QCD sum rules and width of these decay channels are estimated. The obtained results for the mass of ~Ξ and ratio of the Br(~Ξ→ ΣK)/Br(~Ξ→ Λ K), with ~Ξ representing the orbitally excited state in Ξ channel, are in nice agreement with the experimental data of the Belle Collaboration. This allows us to conclude that the Ξ(1690) state, most probably, has negative parity.

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