Speaker
Raquel Molina Peralta
(IFIC-UV)
Description
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.
| session | B. Hadron Spectroscopy |
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