https://doi.org/10.1140/epja/i2006-10185-6
QNP 2006
Aspects of strangeness -1 meson-baryon scattering
1
Departamento de Fısica, Universidad de Murcia, E-30071, Murcia, Spain
2
CAFPE and Departamento de Fısica Teórica y del Cosmos, Universidad de Granada, Campus de Fuente Nueva, E-18002, Granada, Spain
* e-mail: oller@um.es
Received:
25
October
2006
Accepted:
1
November
2006
Published online:
22
February
2007
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 O(p 2). The spectroscopy of our solutions is studied within this approach, discussing the rise of the two Λ(1405)-resonances and of the Λ(1670), Λ(1800), Σ(1480), Σ(1620) and Σ(1750). We finally argue about our preferred fit.
PACS: 13.75.Jz Kaon-baryon interactions – / 12.39.Fe Chiral Lagrangians – / 11.80.-m Relativistic scattering theory – / 11.80.Gw Multichannel scattering –
© Società Italiana di Fisica and Springer-Verlag, 2007