2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/47715We explore phenomenologies of the topflavour model for the LEP experiment at $m_{_Z}$ scale. Implications of the model on the $Z$ peak data are studied in terms of the precision variables $ε_i$'s.5 pages (including 1 figs), Use sprocl.sty (attached in the end of the manuscript), Talk delivered at the first APCTP Workshop on Pacific Particle Physic Phenomenology, Oct. 31 -- Nov. 2, 1997, Seoul, KoreaHigh Energy Physics - Phenomenologytext