Kinematical Reconstruction of the ttbar System Near its Threshold at   Future e+e- Linear Colliders
  We developed a new method for full kinematical reconstruction of the ttbar system near its threshold at future linear e+e- colliders. In the core of the method lies likelihood fitting which is designed to improve measurement accuracies of the kinematical variables that specify the final states resulting from ttbar decays. The improvement is demonstrated by applying this method to a Monte-Carlo ttbar sample generated with various experimental effects including beamstrahlung, finite acceptance and resolution of the detector system, etc. A possible application of this method and its expected impact are also discussed. 
Katsumasa Ikematsu, Keisuke Fujii, Zenro Hioki, Yukinari Sumino, and   Tohru Takahashi