Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-02-24
Eur.Phys.J.C29:1-10,2003
Physics
High Energy Physics
High Energy Physics - Phenomenology
14 pages, LaTeX, 11 figures
Scientific paper
10.1140/epjc/s2003-01202-9
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. In most cases the fit brings a broad non-Gaussian distribution of a given kinematical variable to a nearly Gaussian shape, thereby justifying phenomenological analyses based on simple Gaussian smearing of parton-level momenta. The standard deviations of the resultant distributions of various kinematical variables are given in order to facilitate such phenomenological analyses. A possible application of the kinematical fitting method and its expected impact are also discussed.
Fujii Keisuke
Hioki Zenrō
Ikematsu Katsumasa
Sumino Yukinari
Takahashi Tohru
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