Why the high-lying glueball does not mix with the neighbouring f 0

Chiral symmetry restoration in high-lying hadron spectra implies that hadrons which belong to different irreducible representations of the parity-chiral group cannot mix. This explains why the , which was suggested to be a glueball, and hence must belong to the scalar (0,0) representation of the chiral group, cannot mix with the neighbouring , which was interpreted as a state, and that belongs to the (1/2,1/2) representation of the chiral group. If confirmed, then we have an access to a true glueball of QCD.Received: 18 July 2003, Published online: 5 January 2004PACS: 12.39.Mk Glueball and nonstandard multi-quark/gluon states - 11.30.Rd Chiral symmetries