2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/171572We study the effects of final state interactions on the eta(b) => J/psi J/psi decay. In particular, we discuss the effects of the annihilation of eta(b) into two charmed meson and their rescattering into J/psi J/psi. We find that the inclusion of this contribution may enhance the short-distance branching ratio up to about 2 orders of magnitude.Parallel talk at ICHEP08, Philadelphia, USA, July 2008. 3 pages, LaTeX, 3 eps figuresHigh Energy Physics - Phenomenologytext