Five-quark components in baryons

por Bing-song Zou (Institute of High Energy Physics and Theoretical Physics Center for Science Facilities, CAS)

viernes 14 mar. 2008 12:00 → 13:00 Europe/Madrid

Sala Seminarios IFIC (Edf. Institutos de Investigación)

A^ review on some recent progresses in our understanding of^ 5-quark componentsin baryons is presented. Two most possible configurations, diquark-diquark-antiquark and meson cloud, for the 5-quark components in^ baryons are discussed. The diquark-diquark-antiquark picture gives a natural^ explanation not only to the empirical indications for a positive^ strangeness magnetic moment �/_s /, positive strangeness radius of the^ proton and single spin asymmetry but also the longstanding mass- reverse problem of /N/*(1535), /N/*(1440)^ and Lambda*(1405) resonances as well as the unusual decay pattern^ of the /N/*(1535) resonance. While the lowest 1/2- baryon nonet may have large diquark-diquark-antiquark component, the lowest 1/2- baryon decuplet is proposedto have large vector-meson- baryon components. Evidence for the "missing" members of these pictures is pointed out and suggestions are made for detecting these predicted states from forthcoming experiments.