Top Quark Pair Production and Decay Near Threshold in e+e- Collisions
Abstract
We review the physics involved in the production and decay of top quarks in e+e- -> ttbar near threshold, with special emphasis on the recent theoretical study on the decay process of top quarks in the threshold region. The energy-angular distribution of l+ in semileptonic top decays is calculated including the full O(alphas) corrections. Various effects of the final-state interactions are elucidated. A new observable is defined near threshold, which depends only on the decay of free polarized top quarks, and thus it can be calculated without bound-state effects or the final-state interactions.
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