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| Paper IPM / Physic / 15198 |
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| Abstract: | |||||||
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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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