2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/49359Recent results concerning the evidence and classification of the J^{PC}=0^{++} states, obtained with P. Minkowski, are presented: The isoscalars f_0(980) and f_0(1500) are classified as members of the 0^{++} nonet, while the broad state called f_0(400-1200) and the state f_0(1370) are considered as different components of a single broad resonance, the lowest-lying 0^{++} glueball. Furthermore, we propose the investigation of glueball production in the fragmentation region of gluon jets.3 pages, talk at EPS-HEP '99 Conference, July 15-21, 1999, Tampere, FinlandHigh Energy Physics - Phenomenologytext