Quark mass dependence of s-wave baryon resonances

We study the quark mass dependence of J(P) = 1/2(-) 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(pi) = M-K similar or equal to 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(pi) = m(K) similar or equal to 140 MeV for which no resonances exist. Using physical quark masses our analysis suggests to assign to the S = -2 resonances Xi(1690) and Xi(1620) the quantum numbers J(P) = 1/2(-). (C) 2003 Elsevier B.V. All rights reserved.