Limits on the brane fluctuations mass and on the brane tension scale   from electron-positron colliders
  In 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 $\tau = f^4$ and the branon mass $M$. Prospects for the next generation of electron-positron colliders are also considered. 
J. Alcaraz, J.A.R. Cembranos, A. Dobado, A.L. Maroto