D0 global tracking user's guide: The data
D. Adams
08may00 1630
D0 events are divided into chunks. The global tracking system defines
and writes two kinds of chunks.
Reconstructed tracks
Reconstructed tracks are of type GTrack and reside in the global track chunk
GTrackChunk. These tracks consist of a list of clusters and
a series of states each
characterized by a surface, five track parameters and an error matrix.
The tracks are defined (and described) in
gtrbase.
The chunk is defined in
gtr_evt.
Monte Carlo tracks
Monte Carlo tracks are of type McTrack and reside in the Monte Carlo track
chunk McTrackChunk. These tracks consist of a series of states characterized
by a surface and five track parameters.
This track and chunk are described in the same packages as the
reconstructed track and chunk.
Friendly tracks
The reconstructed tracks are defined at a low level and do not know about
the specific types of the clusters they hold, the geometry system or
the D0 event model. The friendly track provides an interface to
global tracks which incorporates this information. This interface is defined
in the package
d0track.
Accessing the data
Instructions for accessing existing global track data are given on
the data access page.
Chunks and Framework Packages
Chunks and framework packages related to tracks and used by d0sim and
d0reco are described here.
dladams@fnal.gov