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Event simulation which is significantly faster (~100 - 1000 times) than a detailed simulation. The increased speed is usually achieved at the expense of detector detail or the amount of hit information stored per event.
Reference Link (http://www.slac.stanford.edu/BFROOT/www/Computing/Offline/Simulation/web/simcodes/fastsim/fastsim_main.html)
An algorithm which determines the quantities of interest from raw detector data; e.g. a routine that calculates hit time and energy.
A federation is physically represented by a Federated Database File. By BaBar convention the file is named BaBar.FDDB
Reference Link (http://www.slac.stanford.edu/BFROOT/www/doc/workbook/objectivity1/objectivity1.html#terms)
Each federation is identified by a unique Federated Database ID, (FDID), number.
Reference Link (http://www.slac.stanford.edu/BFROOT/www/doc/workbook/objectivity1/objectivity1.html#terms)
A set of related database files and objects that can be accessed by a single application is called a federation or federated database. This is a higher level structure than a database.
Reference Link (http://www.slac.stanford.edu/BFROOT/www/doc/workbook/objectivity1/objectivity1.html#terms)
Unit of cross-section. (1 barn = 10^-28m^2).
A fermion is any particle that has half-integer spin i.e. 1/2. 3/2, 5/2 ...
All leptons and quarks are fermions.
Fermions are so called because they obey Fermi-Dirac statistics - named for physicists Enrico Fermi and Paul Dirac.
Fermions are subject to the Pauli exclusion priciple, preventing identical fermions from having identical quantum numbers.
Reference Link (http://www2.slac.stanford.edu/vvc/theory/spin.html)
Detector coverage based on some quality requirements.
Grounded wire in drift chamber. Six field wires surround each sense wire, and shape the electric field in the cell.
Reference Link (http://www.slac.stanford.edu/BFROOT/www/Detector/CentralTracker/mechanical/drift_system/index.html)
This type of module can terminate or re-direct the subsequent processing of an event based on its filter criteria and the characteristics of an event.
Reference Link (http://www.slac.stanford.edu/BFROOT/www/doc/workbook/framework1/framework1.html)
A basic operation of analysis is creating acceptable candidates for a particular reaction from scratch. For example, K0 candidates can be made by vertexing pairs of pion candidates, vertexing, and applying cuts. To the extent that these are reusable in o ther analyses, they become finders. All the finders take as input one or more lists of BtaCandidates and return a list of the objects they were meant to look for.
Reference Link (http://www.slac.stanford.edu/BFROOT/www/doc/workbook/beta2/beta2.html#finders)
Linux and UNIX command for user information lookup
Reference Link (http://www.slac.stanford.edu/comp/unix/unix-guide/chap8.frame.html)
Low-level software that is run on programmable electronics; e.g. FPGA. Not as rigid as hardware; not as mutable as software.
In a particle physics context, a Fisher Discriminant is a linear combination of some set of measurements. The coefficients of the Fisher Discriminant are determined in a standard way which maximizes its overall ability to discriminate between signal and background events.
In a B Factory context, the set of measurements used in a Fisher Discriminant usually includes various event shape variables, such as the angles between candidate particles, the energy flow within each of nine cones, and the ratio of the second and zeroth Fox-Wolfram moments.
Reference: Fisher, R. A., Annals of Eugenics 7, 179 (1936)
Reference Link (http://www.library.adelaide.edu.au/digitised/fisher/138.pdf)
A fitter is a Beta operator. Given a tree of BtaCandidates it performs a fit to the whole tree interpretingall the constraints (geometric+kinematic), returning a modified version of the tree with improved vertices and momenta.
Reference Link (http://www.slac.stanford.edu/BFROOT/www/doc/workbook/analysis/analysis.html#vertexing)
Electronic device which converts a voltage into a number in one step. Used in the DCH front end electronics and elsewhere.
A fire suppresent gas. It is an ozone friendly HALON substitute. FM2000 is heptafluoropropane, also known as HFC-27ea.
Two real meanings related to computing. You can format a device to remove all data on it and lay it out for use by the OS. You could also talk about a file format (the layout of data within it). (A third is the fortran FORMAT command which defines the layout of a WRITE output.)
A series of meetings regarding BaBar physics, reconstruction, and simulation.
Reference Link (http://www.slac.stanford.edu/BFROOT/www/Physics/Forum/forum.html)
Fox Wolfram moments (FW(l) of order l = 0, 1, 2 ..) are defined as : Sum_ij |p_i| |p_j| P_l (cos theta_ij), where the summation is over all final state particles, p_i and p_j are momenta of the particles i and j, theta_ij is the angle between them and P_l are the Legendre polynomials of order l : P_0(x) = 1, P_1(x) = x, P_2(x) = (1/2)(3x^2-1), P_3(x) = (1/2)(5x^3-3x), P_4(x) = (1/8)(35x^4-30x^2+3), P_5(x) = (1/8)(63x^5-70x^3+15x), P_6(x) = (1/16)(231x^6-315x^4+105x^2-5), ...
In the context of a HEP experiment such as BaBar, the framework is a system that allows physicist developed code to be combined with code developed by others to perform analysis. The framework is implemented by the Framework package.
Reference Link (http://www.slac.stanford.edu/BFROOT/www/doc/workbook/framework1/framework1.html)
The system electronics responsible for amplifying, digitizing, and selecting time slices from the detector signals.
A temporary data storage area in the on-detector electronics where event data is stored until it can be transmitted to the data acquisition readout modules.
A unit of measure of worker effort. If two people work on a job full time then that is 2 FTEs, if they both work half time then it is only 1 FTE.
Forward end of detector (south end); incoming beam is LER (e+)
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