Zou, BS (reprint author), CAS, Inst High Energy Phys, POB 918, Beijing 100049, Peoples R China.
Article; Proceedings Paper
Evidence has been accumulating for the existence of significant intrinsic non-perturbative five-quark components in various baryons. The inclusion of the five-quark components gives a natural explanation of the excess of (d) over bar over (u) over bar, significant quark orbital angular momentum in the proton, the problematic mass and decay pattern of the lowest 1/2(-) baryon nonet, etc.. A breathing mode of qqq <-> qqqq (q) over bar is suggested for the lowest 1/2(-) baryon octet. Evidence of a predicted member of the new scheme, Sigma*(1/2(-)) around 1380 MeV, is introduced.