Introduction
The goal of global tracking is to find and fit the tracks in a D0 event
using event data from one or more of the D0 subdetectors. The goal of
vertexing is to provide reliable primary and secondary vertices made from
the global tracks.
The input event data for tracking is a collection of clusters from each subdetector. The
output is a collection of global tracks where each track
contains a list of clusters and one or more kinematical fits based on this
list. These are given to the vertexing package whose output is primary and/or
secondary vertices.
This page serves as the gateway for documentation of the D0 Run II global
tracking and vertexing software. It describes (or provides links to)
the organization of the code and management and status of the project.
Need to learn more, see the
tracking tutorial
section or the vertexing
tutorial section.
Tracking algorithms:
Currenlty GTR group supports and develops three tracking algorithms:
a histogramming method (HTF), a road-following method (AA) which
has been combined with HTF, and another road-following method (GTR) which
provides a common infrastructure for propagation, refitting, and multiple
scattering and energy loss correction.
More information is available
here.
Additional information on tracking algorithms studies is available from the
Tracking Algorithm Recommendation Committee (TARC II).
A project has been started to tune the momentum scale of the track
reconstruction by tuning the magnetic field and tracker material model.
Additional information can be found in the
tracking momentum scale page.
Latest results: t03.21.00 (Z->mumu + Nmb)
| Nmb | eff | geff | fake | misr | fchi | mchi |
| 0.0 | 0.949 | 0.880 | 0.007 | 0.073 | 1.319 | 5.921 |
| 1.0 | 0.948 | 0.873 | 0.009 | 0.079 | 1.347 | 5.948 |
| 2.0 | 0.945 | 0.867 | 0.010 | 0.083 | 1.375 | 6.031 |
| 3.0 | 0.942 | 0.863 | 0.012 | 0.084 | 1.403 | 6.095 |
| 4.0 | 0.940 | 0.858 | 0.015 | 0.087 | 1.426 | 6.107 |
| 5.0 | 0.937 | 0.854 | 0.018 | 0.089 | 1.430 | 6.105 |
| 6.0 | 0.930 | 0.847 | 0.023 | 0.090 | 1.472 | 6.177 |
| 8.0 | 0.924 | 0.837 | 0.035 | 0.094 | 1.496 | 6.188 |
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eff - efficiency,
geff - well-reconstructed efficiency,
fake - fake rate, misr - number of misreco,
fchi - fit chisquare/dof,
mchi - match chisquare
For more details see our
result section.
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News
Jan 1, 2006
Testing
Mar. 17, 2003
Default tracking algorithm changed to htf+aa smart combination
(-tracking htfAA) as of t03.10.00, p14.01.00, p15.01.00.
Nov. 7, 2002
Updated AA algorithm: eff=90.3%, misreco/fake rates 6.9%/1.5% for ttbar 2.5mb MC sample
more
Nov. 1, 2002
Tracking efficiency for Z->ee is 76% overall, 85% in central region,
more
Oct. 31, 2002
In p13.02.00 you can run AA algorithm with refit by
more... |
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For more information, bug reports, problems, please send an Email to:
d0_global_tracking@fnal.gov
We hold weekly meetings
Thursday at 3:30 in the Farside.
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