2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/45256We present a model--independent analysis of the $Z b \bar b$ vertex, with the aim of constraining contributions of new physics to the left- and right--handed couplings of the $b$. We find that the left--handed coupling of the $b$ is quite narrowly constrained by present data, but that the right--handed coupling is still largely unconstrained.5 pages, with 4 PostScript figuresHigh Energy Physics - Phenomenologytext