Big-bang nucleosynthesis with long-lived charged slepton

We consider constraints on long-lived charged scalar leptons (l) over bar (+/-) in supersymmetric models, where gravitino is the lightest superparticle. We study the decay and hadronization processes of (l) over tilde (+/-). We also take into account the significant enhancement of L-6 production due to the formation of the bound-state (He-4 (l) over tilde (-)); for this purpose, we use the reaction rate given by the most recent calculation based on coupled-channel method. (c) 2007 Elsevier B.V. All rights reserved.