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A tag is used by BaBar to identify a version of BaBar package. For example, tag V01-02-03 for SoftRelTools signifies major version 01, medium version 02, and minor version 03 of package SoftRelTools.
This refers to contributions by collaborators to keep the BABAR detector running effectively. As defined in the BABAR Collaboration Services Policy: "It is expected that all institutions in the collaboration contribute to the ongoing operation of the experiment. These contributions include detector systems and core software operations and maintenance; coordination and management tasks; physics tools development and infrastructure support; Monte Carlo production; and a host of other jobs both in the operation of the detector and computing
Reference Link (http://www.slac.stanford.edu/BFROOT/www/Organization/Administration/CommonTasks17.pdf)
Tcl scripts are used extensively to set up sequences, paths, and to perform general framework setup such as input files. Many types of sequences are worthless if the order of the modules is wrong or if some modules of the sequence are not enabled. Tcl sc ripts maintain this coherence. There is often a script file for each sequence.
Reference Link (http://www.slac.stanford.edu/BFROOT/www/doc/workbook/framework1/framework1.html#tcl)
Technical Design Report: Final document describing the detector design at start of construction.
Reference Link (http://www.slac.stanford.edu/BFROOT/www/doc/TDR/)
Document describing the design of the BaBar Detector at the time of construction.
Reference Link (http://www.slac.stanford.edu/BFROOT/www/doc/TDR/)
The process by which the design of the experiment is review both internally (by those participating in the experiment) and externally (by funding agencies). Critical items include feasibility, performance and budget issues. The Technical Design Report provides a starting point for many of the issues covered.
Reference Link (http://www.slac.stanford.edu/BFROOT/www/doc/TDR/)
test is a symbolic link to the most recent release which has passed basic tests, such as running the full reconstruction on a small number of events. The reconstruction coordinator determines which release this should point to. Not all latest releases will become test releases.
Reference Link (http://www.slac.stanford.edu/BFROOT/www/doc/workbook/srt1/srt1.html)
Test beams are used to test detector components before building them. This aids in making sure that it behaves as expected. They are also used in testing new technology to see if it bahaves as hoped.
The basic principle behind SRT, from a user's point of view, is that users create their own, private, releases. In the users case, a test release is typically a very lightweight collection of directories that is tied to a full BaBar release.
Reference Link (http://www.slac.stanford.edu/BFROOT/www/doc/workbook/srt1/srt1.html#using_srt)
This is a multi-level acronym. ACE stands for the Adaptive Communications Environment, a set of object-oriented wrappers around a set of operating system calls, e.g., network socket manipulation, timers, etc. ORB stands for Object Request Broker, an ob ject-oriented interprocess(or) communication scheme, in this case adhering to the CORBA (Common Object Request Broker Architecture) standard. CORBA is generally available on all modern computer and OS platforms and for various object-oriented languages
Reference Link (http://www.cs.wustl.edu/~schmidt/TAO.html)
The title of the BaBar operations manual. Short form: The Care Manual.
Reference Link (http://www.slac.stanford.edu/BFROOT/www/Detector/Operations/CareAndFeeding/care/care.html)
The name of a detector and an experiment located at the Fermilab colliding ring.
Reference Link (http://www-cdf.fnal.gov/)
This is a collaboration of about 450 physicists who are running a large particle detector at the electron-proton collider HERA at the DESY laboratory in Hamburg. The ZEUS detector is a sophisticated tool for studying the particle reactions provided by the high-energetic beams of the HERA accelerator.
Reference Link (http://www-zeus.desy.de/)
The thrust axis is the direction which maximizes the sum of the longitudinal momenta of the particles. In the case of a background event, the thrust axis corresponds to the axis along the primary quark-antiquark pair produced from e+e- annihilation. For a true B event, the quark-antiquark pair is typically at rest in the C of M frame so the thrust axis tends to be distributed isotropically.
Reference Link (http://www.slac.stanford.edu/BFROOT/dist/releases/newest/BetaCoreTools/BtaThrust.hh)
Large computing centres made available for BaBar needs.
Electronic device for converting a time interval into number.
Time of Flight
Whenever you log in to UNIX via an AFS account, AFS checks the password you supply to make sure that you are who you claim. If you are, AFS grants you a token and thereby authenticates you as a valid AFS user.
Reference Link (http://www.slac.stanford.edu/BFROOT/www/doc/workbook/unix/unix.html#afs_and_nfs)
The user interface to the framework is based on Tcl, (Tool Command Language). Tcl, often pronounced "tickle", provides both a scripting language and a command line interpreter. BaBar uses the standard Tcl with some added BaBar specific commands.
Reference Link (http://www.slac.stanford.edu/BFROOT/www/doc/workbook/framework1/framework1.html#tcl)
Tool Kit, (Tk), is a graphical interface layed over Tcl.
Reference Link (http://www.slac.stanford.edu/BFROOT/www/doc/workbook/framework1/framework1.html#tcl)
Injecting more electrons (or positrons) in the bunches circulating in the PEP rings, to compensate for the beam losses due to finite beam lifetime.
In the EMC world, it indicates a group of crystals of the electro-magnetic calorimeter. For trigger purposes, the crystals are grouped into 280 towers of 24 (for the barrel) or 20/21 (for the endcap) crystals each. In the barrel, the towers all corresp ond to an 8x3 (theta x phi) crystal array. The endcap has not the same 40-fold phi simmetry as the barrel, so the arrangement of crystal in towers is more complex. More documentation including numbering scheme can be found in Babar note #519 (pp.13-1
A collection of hits in the SVT and drift chamber which are fit to an hypothesis trajectory through space. In BaBar, tracks are fit using a "Kalman filter" algorithm which assumes a piecewise helix trajectory hypothesis.
Reference Link (http://www.slac.stanford.edu/BFROOT/www/Computing/Offline/Reconstruction/Tracking/trackDocu.html)
Reference Link (http://www.slac.stanford.edu/BFROOT/www/Detector/Trigger/98/tsf_fdr/tsf_fdr.html)
Process of finding charged track signatures in the detector and fitting them to a specific parameterization.
Reconstructed trajectories of charged particles.
In the EMC DAQ system, the transition board is the interface between the fiber-optics and the electrical interface of the IOB.
Reference Link (http://www.slac.stanford.edu/BFROOT/www/Detector/DAQ/Calorimeter/WriteUps/EMCDAQDoc.html)
TCP is responsible for verifying the correct delivery of data from client to server on a TCP/IP network. Data can be lost in the intermediate network. TCP adds support to detect errors or lost data and to trigger retransmission until the data is correctl y and completely received.
Reference Link (http://www.stortek.com/)
The trigger system.
Detector system responsible for selecting events for logging. BaBar trigger is multilayered consisting of hardware level 1 (L1) trigger and software level 3 (L3) trigger.
Reference Link (http://www.slac.stanford.edu/BFROOT/www/Detector/Trigger/index.html)
In high energy physics, a trigger is a combination of hardware and software components providing a signal whenever an interesting event occurs.
Reference Link (http://rkb.home.cern.ch/rkb/PH14pp/node195.html#SECTION0001950000000000000000)
To add an entry to the Glossary use the BaBar Glossary Submission Form.
All comments, requests, and corrections are welcome. Send them by e-mail.
Last significant update: 10-Sept-2002