2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/207622In the context of the brane-world scenarios with compactified large extra dimensions, we study the production of the possible massive brane oscillations (branons) in electron-positron colliders. We compute their contribution to the electroweak gauge bosons decay width and to the single-photon and single-Z processes. With LEP-I results and assuming non observation at LEP-II, we present exclusion plots for the brane tension $τ= f^4$ and the branon mass $M$. Prospects for the next generation of electron-positron colliders are also considered.LaTeX, 38 pages, 7 figures. Minor changes, matches published versionHigh Energy Physics - PhenomenologyHigh Energy Physics - Theorytext