2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/44737The $η_6$, a ``heavy axion'' associated with sextet quark electroweak symmetry breaking, may have been seen at LEP via its two-photon decay mode and also at TRISTAN via its hadronic decay modes. - presented at DPF 92.7 pages, ANL-HEP-CP-92-117/BROWN-HET-885High Energy Physics - Phenomenologytext