On charm baryon resonances and chiral symmetry

Abstract

We study heavy-light baryon resonances with quantum numbers J^P=1/2^- in terms of the non-linear chiral SU(3) Lagrangian. Within the chi-BS(3) approach a parameter-free leading order prediction is obtained for the scattering of Goldstone bosons off heavy-light baryon resonances with J^P=1/2^+. The three states Lambda_{c1}(2593), Lambda_{c0}(2880) and Xi_{c1}(2790) discovered by the CLEO collaboration are recovered. We suggest the existence of resonance states that form an anti-quindecimplet, two sextet and two anti-triplet representations of the SU(3) group. In particular, narrow states with anomalous isospin (I) and strangeness (S) quantum numbers (I,S)=(1/2,+1) are anticipated.