2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/179310We discuss effects of fragmentation and hard gluon radiation on the signal for the pair production of the lighter scalar top eigenstate $\tilde{t}_1$ at e^+e^- colliders. The main emphasis is on scenarios with small stop--LSP mass splitting, where strong interaction effects can considerably modify kinematical properties of the final state.4 pages, 2 figures, uses sprocl.sty. Proceedings of the LCWS99, International Workshop on Linear Colliders, Sitges, Spain (May 1999) and Particles in Astrophysics and Cosmology: From Theory to Observation, Valencia, Spain (May 1999)High Energy Physics - Phenomenologytext