On baryon resonances and chiral symmetry
arXiv:nucl-th/0305101 · doi:10.1016/j.physletb.2004.01.066
Abstract
We study J^P=(3/2)^- baryon resonances as generated by chiral coupled-channel dynamics. Parameter free results are obtained in terms of the Weinberg-Tomozawa term predicting the leading s-wave interaction strength of Goldstone bosons with baryon-decuplet states. In the 'heavy' SU(3) limit with m_π= m_K \sim 500 MeV the resonances turn into bound states forming a decuplet and octet representation of the SU(3) group. Using physical masses the mass splitting are remarkably close to the empirical pattern.
revised version: includes two additional references, gives improved discussions and eliminted some misprints