On the strangeness -1 S-wave meson-baryon scattering
Departamento de Fısica, Universidad de Murcia, E-30071, Murcia, Spain
Accepted: 11 April 2006
Published online: 10 May 2006
We consider meson-baryon interactions in S-wave with strangeness -1. This is a non-perturbative sector populated by plenty of resonances interacting in several two-body coupled channels. We study this sector combining a large set of experimental data. The recent experiments are remarkably accurate demanding a sound theoretical description to account for all the data. We employ unitary chiral perturbation theory up to and including O(p 2) to accomplish this aim. The spectroscopy of our solutions is studied within this approach, discussing the rise from the pole content of the two Λ(1405) resonances and of the Λ(1670), Λ(1800), Σ(1480), Σ(1620) and Σ(1750) ones. We finally argue about our preferred solution.
PACS: 11.80.-m Relativistic scattering theory – / 11.80.Gw Multichannel scattering – / 12.39.Fe Chiral Lagrangians – / 13.75.Jz Kaon-baryon interactions –
© Società Italiana di Fisica and Springer-Verlag, 2006