Last update:
Apr 1, 2000
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Adaptive Multitrack Fitting
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Rudolf Frühwirth1,
Are Strandlie2
- Institute for High Energy Physics of the
Austrian Academy of Sciences, Vienna, Austria
- 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:  | Short Paper: |
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