Collider signatures of sneutrino cold dark matter

Decays of sneutrinos are considered in the case that in the presence of lep ton-number violation in the sneutrino sector the lighter tau-sneutrino is t he Lightest Supersymmetric Particle and the Cold Dark Matter in the Univers e. In such circumstances the signals from sparticle decays differ considera bly from the "standard" case where the lightest neutralino is the Lightest Supersymmetric Particle and it is found that in a wide range of parameters compatible with the sneutrino Cold Dark Matter hypothesis signatures charac teristic for such a scenario should be easily observable at for example a N ext Linear Collider. (C) 2000 Elsevier Science B.V. All rights reserved.