Quark mass dependence of s-wave baryon resonances
arXiv:nucl-th/0305100 · doi:10.1016/j.physletb.2003.11.073
Abstract
We study the quark mass dependence of $J^P = \frac12^-$ s-wave baryon resonances. Parameter free results are obtained in terms of the leading order chiral Lagrangian. In the 'heavy' SU(3) limit with $m_Ï=m_K \simeq $ 500 MeV the resonances turn into bound states forming two octets plus a singlet representations of the SU(3) group. A contrasted result is obtained in the 'light' SU(3) limit with $m_Ï=m_K \simeq $ 140 MeV for which no resonances exist. Using physical quark masses our analysis suggests to assign to the $S=-2$ resonances $Î(1690)$ and $Î(1620)$ the quantum numbers $J^P=1/2^-$.
4 pages, 2 figure