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Last update: Apr 1, 2000

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A018

Adaptive Multitrack Fitting

Rudolf Frühwirth1, Are Strandlie2
  1. Institute for High Energy Physics of the Austrian Academy of Sciences, Vienna, Austria
  2. Department of Physics, University of Oslo, Norway and Department of Electrical Engineering and Science, Gjøvik College, Norway

Speaker: Rudolf Frühwirth

  In this contribution we address the problem of estimating the parameters of very close or overlapping tracks. In order to achieve optimal performance the estimation process has to be carried out concurrently with the task of assigning the observations to the track candidates. We present a new method based on the Deterministic Annealing Filter (DAF) which implements a global competition allowing all hits to compete for all tracks at any given step of the filter. The method is studied on simulated tracks in the ATLAS Transition Radiation Tracker. Due to the inherent left-right ambiguity of the detector there is a large background of mirror hits in addition to the genuine observations. We show that the new method is superior to a sequential application of the DAF to the track candidates, and also superior to a simple competition either between hits or between tracks. We also discuss the influence of the annealing schedule and of the track initialization on the results. Finally we show that an even better performance can be achieved if prior knowledge about the relation between hits and their mirror hits is taken into account.

Presentation:  Adobe Acrobat pdf Short Paper:  Adobe Acrobat pdf 



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