QNP2024 - The 10th International Conference on Quarks and Nuclear Physics

One or two poles for the Ξ(1820) ?

10 Jul 2024, 14:40

20m

Aula M2 (Facultat de Biologia)

Contributed talk B. Hadron Spectroscopy

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 $\mathrm{\Xi }(1820)$ 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 $K^{-}\mathrm{\Lambda }$ mass distribution in the $\psi (3686)$ decay to
$K^{-}\mathrm{\Lambda }{\overline{\mathrm{\Xi }}}^{+}$, which demands a width much larger than the average
of the PDG, and show how the consideration of the two $\mathrm{\Xi }(1820)$ states
provides a natural explanation to this apparent contradiction.

Presentation materials

hadron_qnp (2) (1).pdf