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Covariant meson-baryon scattering with chiral and large N_c constraints
We give a review of recent progress on the application of the relativistic
chiral SU(3) Lagrangian to meson-baryon scattering. It is shown that a combined
chiral and 1/N_c expansion of the Bethe-Salpeter interaction kernel leads to a
good description of the kaon-nucleon, antikaon-nucleon and pion-nucleon
scattering data typically up to laboratory momenta of p_lab about 500 MeV. We
solve the covariant coupled channel Bethe-Salpeter equation with the
interaction kernel truncated to chiral order Q^3 where we include only those
terms which are leading in the large N_c limit of QCD.Comment: 27 pages, 5 figures, Invited talk given by M.F.M.L. at the IARD 2000
meetin
Charmed meson resonances from chiral coupled-channel dynamics
Charmed meson resonances with quantum numbers J^P=0^+ and J^P=1^+ are
generated in terms of chiral coupled-channel dynamics. At leading order in the
chiral expansion a parameter-free prediction is obtained for the scattering of
Goldstone bosons off charmed pseudo-scalar and vector mesons. The recently
announced narrow open charm states observed by the BABAR and CLEO
collaborations are reproduced. We suggest the existence of states that form an
anti-triplet and a sextet representation of the SU(3) group. In particular, so
far unobserved narrow isospin-singlet states with negative strangeness are
predicted.Comment: Presented at Hadron 03: 10th International Conference on Hadron
Spectroscopy, Aschaffenburg, Germany, 31 Aug - 6 Sep 200
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