Speaker
Jose Antonio Oller
(Marcia University)
Description
We consider meson-baryon interactions in S-wave with
strangeness -1.
This is a sector populated by plenty of resonances interacting in
several two-body coupled channels. We
consider a large set of experimental data, where the recent
experiments are
remarkably accurate. This requires a sound theoretical
description to
account for all the data and we employ Unitary Chiral
Perturbation Theory up to and including ${\Opd}$. The
spectroscopy of
our solutions is studied within this approach, discussing the rise
of the two $\Lambda(1405)$ resonances and of the
$\Lambda(1670)$,
$\Lambda(1800)$, $\Sigma(1480)$, $\Sigma(1620)$ and
$\Sigma(1750)$, all the strangeness=-1 $1/2^-$ resonances below
1.8
GeV in the PDG. We finally argue about our preferred fit.
Primary author
Jose Antonio Oller
(Marcia University)
