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How well can we reconstruct the \(t\bar{t}\) system near its threshold at future ee linear colliders?

  • K. Ikematsu
  • K. Fujii
  • Z. Hioki
  • Y. Sumino
  • T. Takahashi
Theoretical Physics

Abstract.

We developed a new method for the full kinematical reconstruction of the \(t\bar{t}\) 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 \(t\bar{t}\) decays. The improvement is demonstrated by applying this method to a Monte Carlo \(t\bar{t}\) sample generated with various experimental effects including beamstrahlung, finite acceptance and resolution of the detector system, etc. In most cases the fit takes 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 the 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.

Keywords

Standard Deviation Detector System Measurement Accuracy Experimental Effect Kinematical Variable 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg / Società Italiana di Fisica 2003

Authors and Affiliations

  • K. Ikematsu
    • 1
  • K. Fujii
    • 2
  • Z. Hioki
    • 3
  • Y. Sumino
    • 4
  • T. Takahashi
    • 5
  1. 1.Department of Physics, Hiroshima University, Higashi Hiroshima 739-8526, Japan JP
  2. 2. IPNS, KEK, Tsukuba 305-0801, Japan JP
  3. 3. Institute of Theoretical Physics, University of Tokushima, Tokushima 770-8502, Japan JP
  4. 4. Department of Physics, Tohoku University, Sendai 980-8578, Japan JP
  5. 5. Graduate School of Advanced Sciences of Matter, Hiroshima University, Higashi Hiroshima 739-8530, Japan JP

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