Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-09-22
Physics
High Energy Physics
High Energy Physics - Phenomenology
10 pp, 3 figs, plenary talk, X. International Conference on Hadron Spectroscopy (HADRON '03), August 31 - September 6, 2003, A
Scientific paper
10.1063/1.1799775
In the first part of the talk, I review what we know (or rather do not know) about the structure of the QCD vacuum in the presence of strange quarks. Chiral perturbation theory allows to study reactions of pions and kaons and to further sharpen our understanding of symmetry violation in QCD. I review recent progress on the description of pion-kaon scattering, in particular concerning isospin violation and the extraction of threshold and resonance parameters from Roy-Steiner equations. In the third part, it is shown how a unitary extension of chiral perturbation theory leads to novel insight into the structure of the Lambda(1405).
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