Global Tracking System (gtr

Global Tracking System (package gtr_sys)

30oct01 0740
Code version 0.21

An introduction to D0 global tracking may be found at http://www-d0.fnal.gov/global_tracking.

This package provides scripts to run the global tracking executable. See this page.

An example package for studying global tracking may be found in the src directory.

Links to code

The description below includes links to the code contained in this package. This version of the code may not be the most recent.

Description

This is the top-level package in GTR, the global tracking system. It contains documentation for the system and builds a binary which includes all the system framework packages.

Figures show the system dependencies (postscript), package dependencies (postscript, gif, java) and the data flow for this system. These diagrams also include the CFT as an example of a subdetector.

There is also a figure showing the division of the D0 detector into different tracking regions.

GTR packages

The global tracking system consists of the following packages:

d0cluster -generic D0 cluster interface

d0cluster_evt -generic D0 cluster chunk interface

gtrmat -material interactions

gtrprop -material interactions

gtrbase -base classes including GTrack and McTrack

gtr_evt -event interface (chunks)

gtrselect -chunk selector based on content ID

gtrmix -subdetector interface

gtr_dump -framework package to dump global tracks

gtrfit -classes to fit global tracks

gtr_find -framework package to find tracks

gtr_tuple -framework package to create track ntuple for analysis

gtr_analyze -framework package to create reco analyze global tracking branches

gtr_mcfill -framework package to fill McTrack chunk from user input

gtr_mcsim -framework package to fill McTrack chunk from Monte Carlo chunks

gtr_mcfind -framework package to find tracks using Monte Carlo information

gtr_refit -framework package to refit global tracks

gtr_sys - this package

In addition, the following are used for analysis.

gtr_tree -reads and writes standard TTree branches

gtr_root -ROOT analysis

gtr_lyze -PAW analysis

gtr_proptest -Propagator verification

Here are the release notes for this system. Some older release notes may be found here.

System dependencies

GTR depends on the following systems:

TRF++ - generic track-finding system

CFT - Scintillating fiber tracking software

SMT - Silicon microstrip tracking software

Chunks and framework packages

GTR defines the follwing chunks (event data):

GTrackChunk - holds a collection of reconstructed tracks
McTrackChunk - holds a collection of Monte Carlo tracks

and the following framework packages (reconstructors):

GtrFindPkg - finds tracks (GTrackChunk) from subdetector clusters
GtrMcFillPkg - generates MC tracks (McTrackChunk)
GtrMcTrackPkg - creates MC tracks (McTrackChunk) from Mont Carlo chunks.
GtrTuplePkg - creates an anlysis ntuple from MC and reconstructed tracks (McTrackChunk and GTrackChunk).
GtrClusterSimPkg - Generates subdetector clusters from MC tracks

Chunks and Packages used by D0Sim and D0Reco

Click here to find a summary of chunks and packages used in d0sim and d0reco for cft, smt, and global tracking.

Objects

This package creates the object RegisterGtrD0om which registers all GTR chunks with D0OM.

Binary

This package creates a binary gtr containing all the above framework packages. Examples using gtr may be found on d0mino.fnal.gov in ~dladams/run.

D0OM reference headers

Here is a discussion of our handling of D0OM reference headers.

C++ style guide

Questions or comments to dladams@fnal.gov.