Positive parity pentaquarks in a Goldstone boson exchange model - art. no.111501

We study the stability of the pentaquarks <uudd(Q)over bar>, <uuds(Q)over b ar> and <udss(Q)over bar>Q (Q = c or b) of positive parity in a constituent quark model based on Goldstone boson exchange interactions between quarks. The pentaquark parity is the antiquark parity times that of a quark excite d to a p shell. We show that the Goldstone boson exchange interaction favor s these pentaquarks much more than the negative parity ones of the same fla vor content but all quarks in the ground state. We find that the nonstrange pentaquarks are stable against strong decays. [S0556-2821(98)50321-9].