On meson resonances and chiral symmetry

We study meson resonances with quantum numbers JP = 1+ in terms of the chiral SU(3) Lagrangian. At leading order a parameter-free prediction is obtained for the scattering of Goldstone bosons off vector mesons with JP = 1- once we insist on approximate crossing symmetry of the unitarized scattering amplitude. A resonance spectrum arises that is remarkably close to the empirical pattern. In particular, we find that the strangeness-zero resonances h1(1380), f1(1285) and b1(1235) are formed due to strong K anti Kμ and K Kμ channels. This leads to large coupling constants of those resonances to the latter states. (orig.)