2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/155135Numerical simulations have shown that the recently proposed "crab waist" scheme of beam-beam collisions can substantially boost the luminosity of existing and future electron-positron colliders. In this paper we describe the crab waist concept and discuss potential advantages that such a scheme can provide. We also present the results of beam-beam simulations for the two currently proposed projects based on the crab waist scheme: the DAFNE upgrade and the Super B-factory project.Invited talk at IR07 Workshop (Interaction Regions for the LHC Upgrade, DAFNE and SuperB), 7-9 November 2007, Frascati, ItalyAccelerator Physicstext