2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/42827The new narrow resonance which has been observed at the B factories is assigned to the I_z=0 component of iso-triplet charmed four-quark mesons, and as its consequence, existence of additional narrow resonances in different channels is predicted.3 pages, 0 figure, RevtexHigh Energy Physics - Phenomenologytext