Concluding talk-seminar on critical issues in development of new linear colliders

The motivation for a TeV electron‐positron collider is revealed when such a collider is compared with a TeV proton‐antiproton collider. The signal‐to‐background ratio for electron‐positron collisions at the constituent energy equivalent to a hadron collider is greatly superior, luminosities for electron‐positron colliders in the quark regime is higher than that attainable in storage ring colliders, and ‘‘none of the energy thresholds for the new phenomena predicted to exist in the next energy range are quantitatively predicted.’’ Studies of different methods of accelerating electrons and positrons have ensued, actively. A review of the results of these studies is presented. (AIP)