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Two states for the $\Xi(1820)$ resonance. (arXiv:2309.03618v1 [hep-ph])

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We recall that the chiral unitary approach for the interaction of
pseudoscalar mesons with the baryons of the decuplet predicts two states for
the $\Xi(1820)$ resonance, one with a narrow width and the other one with a
large width. We contrast this fact with the recent BESIII measurement of the
$K^- \Lambda$ mass distribution in the $\psi(3686)$ decay to $K^- \Lambda
\bar\Xi^+ $, which demands a width much larger than the average of the PDG, and
show how the consideration of the two $\Xi(1820)$ states provides a natural
explanation to this apparent contradiction.

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