Abstract
In order to observe a signal of possible CP violation in top-quark couplings, we have studied the energy correlation of the final leptons in e +e − → t t → l +l −X l ±X at future linear colliders. Applying the recently-proposed optimal method, we have compared the statistical significances of CP-violation-parameter determination using double- and single-lepton distributions. We have found that the single-lepton-distribution analysis is more advantageous.
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