On heavy–light meson resonances and chiral symmetry

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We study heavy–light meson resonances with quantum numbers JP=0+ and JP=1+ in terms of the non-linear chiral SU(3) Lagrangian. At leading order a parameter-free prediction is obtained for the scattering of Goldstone bosons off heavy–light 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. The open-beauty states with (I,S)=(0,−1) are anticipated at 5761 MeV (JP=0+) and 5807 MeV (JP=1+). For the anti-triplet states our results differ most significantly from predictions that are based on the chiral quark model in the open-beauty sector. Strongly bound 0+- and 1+-states with (I,S)=(0,1) at 5643 and 5690 MeV are predicted.