Glossary and Index

Complete: 5

A reference document for information and explanations of acronyms and common terms in the CMS computing, grid-computing, detector, high energy physics and analysis environments.

The WorkBook Glossary is continually being updated with new and improved definitions of acronyms and concepts relating to the CERN, the CMS experiment, the LHC and GRID computing.

The context for the glossary item is given in brackets in italics at the start of the item dealscription.

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

A

AB
Algorithm Board
AC
  • Alternating Current
  • (organisation) Authorship Committee
Account
(computing)
Acknowledgements
(workbook) WorkBookAcknowledgements
ADC
(detector) Analog to Digital Converter
ADD
(physics) Arkani-Hamed-Dimopoulos-Dvali (ADD) model, arXiv:hep-ph/9803315
AFD
(safety) Automatic Fire Detection
AFEB
(detector) Anode Front-End Board, CSC system
AFS
(computing) Andrew File System
AG
Application Gateway
AL3
(safety) Alarm Level 3
AlCaRECO
(analysis) Alignment and Calibration Reconstructed files: AlcaReco data is the special RECO data for the alignment and calibration tasks. It is produced similar to Prompt Reconstruction, in that RAW data is reconstructed using standard CMSSW algorithms to produce the standard RECO data format. However, only regional reconstruction is performed, and only the parts of the event needed for the specific alignment or calibration task are written out. AlcaReco RAW data is likely to be written as a separate online stream, because it must be processed with very low latency.
ALCT
Anode Local Charged Track trigger primitive, CSC system
Algorithm
(analysis) In the RecAlgorithm system, algorithm objects are entities that create new resulting objects or transform input objects. In the EDProducer systems, we distinguish between EDProducers and other algorithms that can perform smaller steps of reconstruction, and that may be composed (i.e. combined) to form an EDProducer.
ALICE
A Large Ion Collider Experiment
Analysis Object Data (AOD)
(analysis) AOD are derived from the RECO information. They are intended to contain, in a convenient, compact format, enough information about the event to support all the typical usage patterns of a physics analysis. They are usable directly by physics analyses. AOD data are produced by the same, or subsequent, processing steps as those that produce the RECO data, and are available at Tier-2 sites (unlike the full RECO data). Reference: WorkBookDataFormats#AoD
ANN
(analysis) Artificial Neural Network
AOD
(analysis) see entry for Analysis Object Data entry.
AOH
(detector) Analog Opto-Hybrid - front-end readout optoelectronics board for CMS Tracker
APD
(detector) Avalanche Photo-Diode
APE
alignment position errors : an additional error applied to the reconstructed hits in order to take misalignment into account in the tracking and refitting.
API
(computing) Application Program Interface
APV
(detector) Analogue Pipeline (Voltage mode), front-end read-out chip of Tracker
APVe
(detector) APV emulator. Reference: CMS.APVeOverview
APV25
(detector) Analogue Pipeline chip, Voltage-mode, 0.25 micrometer technology. Reference: CMS.APVeOverview
ARC
(analysis) Analysis Review Committee
ARC
(grid) Advanced Resource Connector (Grid middleware used in the Nordic countries)
ASIC
(detector) Application Specific Integrated Circuit
ATEX
(safety) ATmosphere EXplosible
ATLAS
(detector) A Toroidal LHC ApparatuS experiment
aTTS
Asynchronous Trigger Throttle System
AUP Acceptable User Policy
(grid) the document you sign to get grid access that tells you what you can and can not do
AWG
American Wire Gauge

B

B1
Beam 1
B2
Beam 2
Bare ROOT
(analysis) Using the ROOT framework to analyse data without accessing the full functionality of the CMS framework. Accesses only member data of classes stored in data files, not the methods of those classes. Reference: WorkBookMakeAnalysis#BareRoot
BCM
(detector) Beam Condition Monitor
BCM1F
(detector) Beam Condition Monitor "Fast"; part of the BRIL sub-system.
BCM1L
(detector) Beam Condition Monitor for Losses; part of the BRIL sub-system.
BCN
Bunch Count Number
BCS
Beam Scintillation Counters
BD
Back Disk
Beam Radiation Monitor (BRM)
(detector) Monitoring and early-warning system for onset of dangerous beam conditions. Designed to protect personnel and particularly the CMS detector, as well as other LHC systems. Reference: CMS.BrmWikiHome
BIC
(safety) Beam Interlock Controller
BIW
(safety) Beam Injection Warning
BMU
(detector) Barrel Muon system
BOBR
Beam Observation system Beam synchronous timing Receiver
Book-keeping
(computing) DBS - Database Book-keeping System: WorkBookDataSamples#RvS
BP
Back Petal
BPix
Barrel Pixel
BPTX
Beam Pickup for Timing for the eXperiments, part of BRM
BR
Branching Ratio
BRAN
Beam RAte of Neutrals
Branch Name
(analysis) For all data that will exist in a form that is traversable and browsable from the ROOT prompt, a branch name is provided. The branch name is composed of a "friendly" product type name, a process name and a module label.
BRIL
(detector) the Beam Radiation, Instrumentation and Luminosity sub-detector system. Composed of three sub-detectors (BCM1F, BCM1L, PLT) segmented into four modules.
BRM
see entry for Beam Radiation Monitor
BSC
Beam Scintillation Counter
BSM
(physics) Beyond Standard Model. Includes such models as SuperSymmetry and Technicolour, but generally describes any physics that extends the current standard model of particle physics.
BST
Beam Synchronous Timing
B-tag
B-tagging associates a single, real number - a discriminator - with each jet.
BTI
Bunch and Track Identifier trigger primitive, DT system
BU
Builder Unit
BTV
b Tag & Vertexing Physics Object Group
Build File
(analysis) Each CMSSW package directory has a file called a "BuildFile" that describes what the package will produce (executable files, etc) and what dependencies the package has. Reference: WorkBookBuildFilesIntro
Buildings
Find onsite CERN building locations: WorkBookHelp#SearcHingCERN
BX
Bunch crossing
BXN
Bunch Crossing Number

C

C++
Primary programming language used in CMS. Programme reference: WorkBookComputingConcepts#ProgLan
CA
Certification Authority (Grid)
CAD
(analysis) CMS Analysis Database
CADI
(analysis) CMS Analysis Database Interface
CAF
(CERN Analysis Facility) Integrates services associated with T1 and T2 centers and performs latency critical, non-automated activities.
CASTOR
(computing) CERN Advanced STORage Manager. Reference: http://castor.web.cern.ch/castor/
CASTOR
(detector) Forward Calorimeter: Centauro And STrange Object Research in nucleus-nucleus colllisions at the LHC. Reference: CASTOR
Candidate Combiners
WorkBookParticleCandidates#CandComb
Candidate Selectors
WorkBookParticleCandidates#CandSel
CASTOR
WorkBookSetComputerNode#ManyLargeFiles
CB
(organisation) Collaboration Board
CC
  • Cosmic Challenge
  • (organisation) Conference Committee (CMS)
CCC
 
  • CERN Control Centre
  • (organisation) Conference Committee Chairperson (CMS)
CCE
(detector) Charge Collection Efficiency
CCM
(detector) Clock and Control Module
CCB
Clock and Control Board, CSC peripheral crate electronics board, 1 per pcrate
CCRC
(computing) Combined Computing Readiness Challenge: four weeks challenge in May 08 prepared by preliminary tests in February.
CCS
(detector) Clock and Control System
CCU
(detector) Communication and Control Unit
CCUM
(detector) Communication and Control Unit Module
CDR
  • Central Data Recording
  • Conceptual Design Review
CDS
CERN Document Server
CE
(grid) Computing Element
CERN
(organisation) European Laboratory for Particle Physics
Certificates
Grid Certificates: WorkBookStartingGrid#BasicGrid
CFC
(detector) Carbon Fiber Composite
CFEB
(detector) Cathode Front-End Board of the CSC system
cfi files
WorkBookWriteFrameworkModule#CreatE
CIE
(safety) Control and Indication Equipment
CINT
A C/C++ interpreter that is embedded in ROOT
CLCT
(detector) Cathode Local Charged Track trigger primitive, CSC system
CLHEP
Class Library for HEP (Software)
CMKIN
(deprecated) WorkBookGeneration#CmkiN
CMM
(detector) Coordinate Measuring Machine
CMN
(detector) Common Mode Noise
CMOS
(detector) Complementary Metal Oxide Semiconductor
CMS
(detector) Compact Muon Soleniod Detector. Reference: WorkBookCMSExperiment#DetectorComponents
CMS Notes
WorkBookHelp#CmsNotes
Cms Remote Analysis Builder (CRAB)
WorkBookCRAB2Tutorial
cmsRun
SWGuideAboutConfigFile
cmssh
(computing) A programmable shell written in python, see WorkBookCmsshTutorial
CMSSW
CMS Software used in offline data analysis including event generation, simulation, and digitisation (for simulated data) as well as reconstruction and analysis (for both simulated and real data). It is also used online e.g. by the StorageManager application.
COCOA
CMS Object-oriented Code for optical Alignment
COM
Color Octet Mechanism
Composite Particle Candidates
WorkBookParticleCandidates#CompCands
Computing Account
WorkBookGetAccount
Computing Model
WorkBookComputingModel
Conditions Database
A database containing information relating to the state of the detector in a particular time interval. Contains information such as calibration details giving accurate positions of detector components. Ecal elements reference: SWGuideEcalOverview#ConditionsDatabase
CondDB
(computing/analysis) see entry for Conditions Database
ConfDB
A configuration database, browser, editor and GUI for the HLT menues
Conference Agendas
WorkBookHelp#AgendaC
Conference Committee
WorkBookHelp#CmsConf
Configuration File (.cfg)
A document specifying which modules, inputs, outputs and services are to be loaded during execution of the cmsRun executable, how to configure these modules and services, and in what order to execute them. Reference: WorkBookConfigFileIntro
Container
An organizational unit within an event, used to collect particular types of data separately.
Contributor Guide
WorkBookContributors
Coordinates
CMSConventions
COSINE
Consistent Online Software INtegration Environment, project integrating online with offline software
CPT
(deprecated) Computing, Physics and Trigger-DAQ. The CMS CPT group essentially covers all computing aspects of CMS operations: including PRS (physics reconstruction and selection), software and development and operations of CMS computing.
CPE
(detector) Cluster Parameter Estimator: algorithm used to determine the position and errors of the CMS Pixel and Strip clusters
CPU
(computing) Central Processing Unit
CRAB (CMS Remote Analysis Builder)
CRAB is a Python program intended to simplify the process of CMS analysis job creation and submission to the grid environment. Reference: WorkBookCRAB2Tutorial
CRack
(detector) Cosmic Rack, a set of TOB rods
CRAFT
(commissioning) Cosmic Run at Four Tesla: Global run of CMS closed and with magnet on.
CRB
Crate Regulator Board - CSC peripheral crate backplane mounted LV power regulator board
CRC
Cyclic Redundancy Check error detection
CRC
(computing) Computing Run Coordinator
CRUZET
(commissioning) Cosmic RUn at ZEro Tesla
CSA06
(computing) Computing, Software and Analysis challenge in 2006. Reference: CSA06
CSA07
(computing) Computing, Software and Analysis challenge in 2007. Reference: CSA07
CSA08
(computing) Computing, Software and Analysis challenge in 2008. Reference: CSA08
CSA14
(computing) Computing, Software and Analysis challenge in 2014.
CSAM
(safety) CERN System for Alarm Management
CSC
(detector) Cathode Strip Chamber muon system
CSCTF
Cathode Strip Chamber Trigger Track Finder
CSM
(physics) Color Singlet Model
CSO
(safety) Cryogenic Safety Officer
CSP
(computing) Computing Shift Person
CSV
Combined Secondary Vertex
CT-PPS
(detector) CMS-TOTEM Precision Proton Spectrometer. Reference: https://cds.cern.ch/record/1753795
CVS
Concurrent Versioning System: WorkBookComputingConcepts#CvsCheckoutModules
CVSweb - web-based tool for searching through CVS repositories, e.g. the CMS Release code. Reference
WorkBookHelp#CVSWeB
CWR
(analysis) Collaboration Wide Review: procedure for reviewing the CMS scientific papers

D

D2S
(data/computing) Data to Surface
DAC
Digital to Analog Converter
DAS
(data/computing) Data Aggregation System
DAQ
(data/computing) Data Acquisition System
DAQMB
Data Acquisition Motherboard, CSC L1 trigger
Data Formats
(data/computing) (DAQ-RAW, RAW, RECO, AOD, TAG, FEVT) WorkBookDataFormats
Data Samples
(data/computing) Finding data samples: WorkBookDataSamples
Data Summary Tape (DST)
(data/computing) deprecated name used to refer to a reduced size dataset containing the most interesting reconstructed objects (see also RECO and AOD formats).
Database Book-keeping System (DBS)
(computing) Tracks dataset locations around the globe. Also sometimes known as Dataset Bookkeeping System. Reference: WorkBookDataSamples#RvS
Dataset
(computing/data) files containing information (list of tracks, momentum, high-level reconstructed objects) about a set of physics collision events recorded from the CMS detector. A dataset might
be a general collection or a more restricted set of events selected using certain filter settings for specific studies. Data is classified in Tiers depending on what types of data the events contain. Dataset labels usually contain a list of tier labels indicating what data they contain eg. RAW, GEN, SIM, RECO, AOD etc.
DB
(computing) Database. Also used often in the context of CMS Computing to refer to the Dashboard monitoring project.
DBMS
(computing) Database Management System
DBS
(computing) See entry for Database Book-keeping System
DC
(computing) Data Challenge: a learning exercise to test operations of large scale computing systems.
DC
(computing) Data Certification
DC
(detector) Direct Current
DCC
(detector) Data Concentrator Card
DCCT
(detector) DC Current Transformer
DCFEB
(detector) Digital Cathode Front-End Board of the (upgraded ME1/1) CSC system
DCS
(detector) Detector Control Systems
DCU
(detector) Detector Control Unit
DD
(physics) Double Diffractive
DDD
Detector Description Database
DDL
Data Description Language
DDT
(organisation) Dataset Definition Team, replaces (announced Mar 2012) Physics Datasets Working Group
DDU
Detector Dependent Unit in DAQ system
Debugging
(computing) See: SWGuideUsersFAQ#Debugging
Detector
(detector) The CMS Detector: WorkBookCMSExperiment#DetectorComponents
Detector Simulation
(analysis) Reference: WorkBookSimDigi#DetSim
Detector Simulation Model (OscarProducer)
(analysis) Reference: WorkBookSimDigi#DetSimMod
DFS
Microsoft Distributed File System deployed at CERN. Web access (requires NICE login), your quota.
Digis
(analysis/data) detector event data as output by the electronics (in simulation: as output by digitizer modules. See also Digitizer). Reference: WorkBookDataFormats
Digitization
(analysis) Reference: WorkBookSimDigi#DigI
Digitizer
(analysis) A digitizer software module takes event input in units appropriate to the readout, e.g., energy from the simulator, or number of photoelectrons from the ECAL subdetector readout, and converts it to digitized (On/Off) data prior to sending it to the trigger. Each subdetector necessarily has its own digitizer, according to the type of readout data. For generated data, the digitizer can be viewed as part of the simulation application.
DIP
Data Interchange Protocol (CERN)
DLS
(computing) Data Location Service
DM
(computing) Data Management
DMB
DAQ MotherBoard of CSC system
DMR
(analysis) Distribution of Median of Residuals, used in alignment of the Tracker
DMWM
Data Management Workflow Management
DN
(grid) Distinguished Name, a.k.a. the Subject of a GRID certificate, -- a globally-unique GRID-user name consisting of a hierarchical set of the following components: Country (C), Organisation (O), Organisational Unit (OU), Locality (L), Common Name (CN). Example: ​/C=RU​/O=RDIG​/OU=users​/OU=itep.ru​/CN=Vladimir Ivanov.
Documentation
(CERN/CMS) CERN and CMS documentation: WorkBookHelp#DocumenTation
DOFZ
(detector) Diffusion Oxygenated Float Zone Silicon
DOH
Digital Opto-Hybrid - front-end control ring optoelectronics board for CMS Tracker, ECAL, RPC, TOTEM
DOHM
Digital Opto-Hybrid Module
DORP
Data Operations and Release Planning
Dosimeters
(radiation protection) Radiation dose measurement devices. Reference: WorkBookComingToCERN#DoSi
Doxygen
(programming) Automatic code-generating system for inter-related C++ packages. Reference: WorkBookHelp#DogyGeN
DPG
(detector) Detector Performance Group
DQM
(data-taking) Data Quality Monitoring: task or application for checking the quality of CMS (event) data.
DQMC
(data-taking) Data Quality Monitoring Collector
DSS
(detector) Detector Safety System
DCS
(detector) Detector Control System
DST
(analysis) see entry for Data Summary Tape
DT
(detector) Drift Tube muon system
DTTF
(trigger) Drift Tube Track Finder system, DT L1 trigger
DV
(_ detector _) Data Valid, a bit set by the HCAL Half-HTR for each signal sample

E

EAM
(safety) Experimental Area Manager
EB
(data acquisition) Event Builder
EB
(detector) ECAL Barrel
EB
(management) Executive Board
EBTCC
(detector) ECAL Barrel Trigger Concentrator Card (see TCC)
ECAL
Electromagnetic Calorimeter. CMS.ECALWikiHome
ECNA
ECAL Correlated Noise Analysis
ECoM
(computing) Evolution of Computing Model Group (2008)
EDAnalyzer
A CMSSW framework module that analyzes event data and may or may not store output into a ROOT output ntuple. The analyzer does not alter the stored the Event. Reference: WorkBookMakeAnalysis#EdAnalyzer
EDFilter
A CMSSW framework module that can read an event and make a decision whether or not to process it
EDG
European Data Grid project
EDM
Event Data Model. Reference: EDM
EDMS
Engineering Database Management System
EDProducer
A top-level, reconstruction-developer written CMSSW framework component that performs a quantifiable step of reconstruction by creating and storing persistable data in the Event. An EDProducer instance produces an EDProduct instance. Any EDProducer class may be used for scheduled and unscheduled applications. Reference: WorkBookEDMTutorialProducer
EDProduct
The output of a CMSSW EDProducer module. An EDProduct is the base class for all objects inserted into the Event.
EDR
Engineering Design Review
EE
(detector) ECAL Endcap
EEE
Eta-extended electrons
EETCC
(detector) ECAL Endcap Trigger Concentrator Card (see TCC)
EF
Event Filter, see entry for event filter
EGEE
The Enabling Grids for E-sciencE (EGEE) project, funded by the European Comission, is aimed to build on existing grid technology to develop a constantly-available grid infrastructure for scientists
EGI European Grid Initiative
an European Community project to operate seemlessly a network of National Grid Initiatives (NGI) after EGEE is over
EIC
Electromagnetic Isolation Card, regional calorimeter trigger
ELMB
Embedded Local Monitoring Board (ECAL)
EMDB
Equipment Management DataBase
Email
EMU
Endcap Muon system
ENC
Equivalent Noise Charge
Encryption
a procedure that renders the contents of a file unintelligible to anyone not authorized to read it
Environment Setup
WorkBookSetComputerNode
EOS
(computing) an XRootD-based storage system (a disk pool) at CERN for analysis-style data access. Web references: cern, cms
EP
Event Processor
EPR
Experimental Physics Responsibility, name given to the service work that should be provided by each CMS institution/author
ES
Endcap preShower detector
ES
Event Server
ES
Event Setup.
ES
ESsource, ESproducer
ESD
Event Summary Data
ESP
Event Server Proxy
ESP
(organisation) Experiment Services and Pledges, the tool (http://cms.cern.ch/iCMS/admin/espmanagement) which is used to manage and account the services to the experiment provided by Institutes and Members under the Memorandum of Agreement (MoA)
ESS
ECAL Safety System
Et
(physics) Transverse Energy
ETTF
Eta Track Finder, DT regional muon trigger
EVB
EVent Builder
Event
an event is set of signals in the detector resulting from a pp collision, or several such coincident collisions, either in reality in CMS or as produced by a simulation program. It includes raw signals (e.g. tracker hits, calorimetric energy deposits, etc.) and derived quantities (e.g. tracks, jets, etc.). In software terms, an event starts as a collection of the raw data from an event, stored as a single entity in memory, but organized into containers. The contents of the event change as it is processed; in particular, products (of producer modules) get added to the event, and are stored in separate containers. The Event is the interface through which one gains access to detector output and derived quantities that are associated with a single colllision.
Event Collection
A set of events typically with similar characteristics - e.g. similar detector conditions, similar event characteristics, ...
Event Data Model
WorkBookCMSSWFramework#EdM
Event Display
The CMS Event Display is IGUANACMS: WorkBookEventDisplay
Event Filter (EF)
A module whose primary purpose is to render a decision on the quality of an event, based on the EDProducts in the event.
Event Formats
WorkBookDataFormats#EvenT
Event Generation
WorkBookGeneration
Event Mixing Module
An EDProducer module that superposes events and delivers them to the detector-dependent digitization modules. For simulated data, it merges hits from a number of pileup simulated events into a single simulated event.
Event Setup
An event setup is a code block that might be included in a general information process block. The block source grabs information from an external source, for example the calibration database, in preparation for beginning an analysis job.
EVF
Event Filter Farm
EVM
Event Manager
EVO
Enabling Virtual Organization (video conferencing/colloboration system). "EVO is an advanced collaboration system based on a completely new and revolutionary distributed architecture capable of automatic self-correction to provide the best possible quality/experience for the end-users", WorkBookHelp#EvO
EW
Electroweak
EWK
Electroweak. Also: Electroweak physics group.
Expressline
(data-taking) The Expressline is 10% of the data that is tagged by Online and then processed (reconstructed) as quickly as possible, even before getting the calibration constants from the PromptCalibration. The Expressline data fully overlaps the main stream of data, i.e. there is no event in the Expressline that is not also in the non-express data streams. The Expressline data will be made available in the CERN CAF disk pool as fast as possible, to allow immediate analysis.

F

FA
(organisation) Funding Agency
FAQ
(general) Frequently Asked Questions
FB
  • (organisation) Finance Board
  • (safety) Fire Brigade
FBO
(DAQ) Fedbuilder Output: xdaq-applicaton running in the computers hosting the RU that receives the superfragments of the fedbuilder. See also the DAQ Glossary.
FC
(computing) File Catalogue
FCC
Future Circular Collider, the working name for a proposed project at CERN
FCAL
(detector) Forward Calorimeter
fCSA08
(computing) Final CSA08: further exercises for LHC collisions to be performed in July (if beam is not imminent).
FDC
Forward Detector Concept Working Group, aiming at the development of long-range strategies for the CMS Upgrade Program in the endcap and forward regions including tracking, calorimetry, muons and trigger (concept Mar 2012)
FDL
Final Decision Logic
FE
(detector) Front End
FEC
(detector) Front End Controller
FED
(_ detector_) Front End Driver
Feedback
(general) providing feedback: WorkBookUsage#ProvideFeedback
FEH
(detector) Front End Hybrid
Fermilab
Work from FNAL computers: WorkBookRemoteSiteSpecifics#CMS.FermiLab
FEVT
Full Event information - this is the RAW (straight from the detectors) plus RECO (undergone some reconstruction) data - the two streams are kept together in CMS. Reference: WorkBookDataFormats
FGSO
(safety) Flammable Gas Safety Officer
Filter
see entry for event filter
Find data
Finding data samples: WorkBookDataSamples
FNAL
Fermilab
FOG
(organisation / trigger) Field Operations Group within the Trigger Studies Group (TSG). Responsible for the online deployment and monitoring of the HLT. Reference: CMS.FieldOperationsGroup
FORTRAN
Programming Language. Mostly superceded in high energy physics by C++ (e.g. Herwig Monte Carlo is now Herwig++)
FPGA
Field Programmable Gate Array
Framework
a C++ class library that defines the form of all user classes and the interactions between these classes. It provides the mechanism for job control to be passed from the operating system (i.e., the computer) to CMSSW code. The CMSSW framework implements a software bus model wherein there is one executable, called cmsRun, and many plug-in modules that run algorithms. The modules are chained together to process data. The same executable is used for both detector and Monte Carlo data. This framework is distinct from a more traditional approach in which several executables are used, one per task or set of tasks.
FPIX
Forward Pixel Detector
Framework-Lite
Analysis modality whereby all functions and data members of a class are accessible by automatically-loaded ROOT libraries in an interactive ROOT session. Reference: WorkBookMakeAnalysis#FwLite
Framework services
These are services, such as the error logger and debugging service, that provide feedback about the state of the Framework (e.g. what module is presently running and meaningful error messages for debugging).
FRL
(data) Front End Readout Link
FROG
the Fast and Realistic OpenGL event displayer is a generic tool to visualize events. It can be use in CMS as well as in other experiment. More informations can be found on FROG webpage : http://projects.hepforge.org/frog/ or on the TWiki page : https://twiki.cern.ch/twiki/bin/view/CMS/FROG.
Frontier
A world-wide distribution and caching system for the Conditions Database. An online version is used by the HLT. http://frontier.cern.ch/
FSC
(detector) Forward Shower/Scintillator Counters -- subdetectors to detect particle showers along the beam pipes (installation: 2012?)
FSM
(detector) Finite State Machine
FSQ
(organisation) the Forward and Small-x QCD Physics Analysis Group (PAG), the result of a merge in 2012 of Forward PAG and Low pT QCD subgroup. Subgroups as of Jan-2012: (1) Small-x QCD, (2) Soft QCD & MPI, (3) Diffraction & Exclusive processes (more details).
FSR
Final State Radiation
FTE
(organisation) Full-Time Equivalent -- a fraction of the full working time (usually over the time period of one year) that a person devotes to a project
FTP
File Transfer Protocol
FU
(data) Filter Unit
FW
(analysis) Framework
FWLite
see entry for Framework-Lite

G

GACL
(computing) Grid Access Control List
GAPD
Geiger avalanche photo diode (also called SiPM)
Gaudi
(analysis) LHCb Data Processing Applications Framework
GCT
(trigger) Global Calorimeter Trigger (part of the L1 trigger). Reference: SWGuideGCTEmulator
GEANT
Pan-European Gigabit Research and Education Network
GED
Global Event Description, aka PF (the Particle Flow approach)
GEM
(detector) Gas Electron Multiplier
GEN
GENerator level data. Reference: WorkBookDataFormats
Geant 4
A toolkit for simulation of the passage of particles through matter
Generator (of Events)
A physics event generator is software that uses Monte Carlo methods to simulate particle collisions and subsequent decays according to theory. Simulated particle events may then be run through the detector simulation to account for the effects of interactions with matter such as energy loss and bending of charge particles in the magnetic field. Pythia is the primary generator used in CMS to model the multiparticle output of a "real" collision of a given type. A generator called a "single particle gun" is used to generate a single particle of a given type; this is particularly useful for testing purposes.
Geom (.geom file extension)
This is the file extension of the FROG file containing the geometry data.
Getter
CMSSW entity that provides an interface through which a single EDProduct is obtained.
GGM
Gas Gain Monitoring system for the RPC muon detector
GID
Global Event Identifier
GLB
Global muon reconstruction. It is made out of the fit of the hits from the track build in the tracker with the ones from the STA.
GLIMOS
(safety) Group Leader In Matters of Safety
gLite
Lightweight middleware for Grid Computing
Global run
(data taking) data taking exercise involving central DAQ, triggered by Global Trigger and with at least one subdetector read-out
Global tag
(analysis) entry point for a coherent set of detetcor conditions, see SWGuideFrontierConditions
Globus
Grid Middleware
GMT
(trigger) Global Muon Trigger. Reference: SWGuideL1GMTEmulator
Goals
Physics of the CMS Experiment at the LHC: WorkBookCMSExperiment#PhysicsGoals
GOH
(detector) Gigabit Optohybrid - front-end readout optoelectronics board for CMS ECAL
GOL
gigabit optical link
GR
Global Run
Grid Certificates
(grid) WorkBookStartingGrid#BasicGrid
GRID computing
(grid) WorkBookStartingGrid
CMS.GridFTP
(grid) Protocol Extensions to FTP for the Grid
GRUMM
(data taking) Global Run Mid-March
GS
(safety) General Infrastructure Services Department
GSF
(pixel reconstruction) Gaussian Sum Filter
GSI
(grid) Grid Security Infrastructure
GT
(trigger) Global Trigger. Reference: SWGuideGlobalTriggerEmulator
GTL
Global Trigger Logic
GUI
(general computing) Graphical User Interface
GUID
(grid) Globally Unique IDentifier

H

Half-HTR
one of two processing units hosted on one HCAL Trigger and Readout card. See DCC and Spigot. (detector)
Harvesting
(data taking) second step of the DQM workflows for offline data or MC - merging of histograms across several files, postprocessing and automated tests. Reference: DQMOffline#SecondStep
HB
(detector) CMS Hadronic Calorimeter, barrel section. Hadron Barrel Calorimeter. Reference: CMS.HCALWikiHome
HBOOK
(analysis) Legacy histogramming package based on Fortran
HCAL
(detector) Hadronic Calorimeter
HE
(detector) CMS Hadronic Calorimeter, end-cap section. Hadronic End-cap Calorimeter.
HE-LHC
High Energy LHC -- an option for the LHC machine development aiming at 16+16 TeV pp collisions after ~2030, see a timeline in CERN Bulletin
HECTOR
(software) Particle transport software. Reference: HECTOR
HEP
(general) High Energy Physics
HepMC package
(analysis/computing) An object oriented event record written in C++ for High Energy Physics Monte Carlo Generators. See HepMC home page .
Help
HF
(detector) Hadron Forward Calorimeter - hadronic calorimetry instrumentation at each end of the main CMS barrel. Reference: CMS.HFWikiHome
HFM
(detector) the "minus" part (z < 0) of Hadron Forward Calorimeter
HFP
(detector) the "plus" part (z > 0) of Hadron Forward Calorimeter
HIP
(physics) Highly Ionizing Particle
Histograms
(analysis) WorkBookWriteFrameworkModule#AddHisto
HL-LHC
High Luminosity LHC -- a project to upgrade LHC around the year 2020 aiming at a substantional increase of the luminosity by a factor of ~10, see a timeline in CERN Bulletin
HLT
(trigger) Higher Level (software) Trigger
HO
(detector) Hadron Outer calorimeter: hadron calorimetry outside the soleniod
hodoscope
(detector) a scientific instrument that detects the passage of a charged particle
HPA
(analysis) High Priority Analysis, e.g. HPAs 2012
HPD
(detector) Hybrid Photo Diode
HPS
(detector) High Precision Spectrometer(s), new subdetectors being proposed for forward proton measurement.
HPS
(physics) Hadron-Plus-Strips algorithm (Particle Flow based algorithm for reconstructing hadronically decaying taus with improved treatment of pi0 reconstruction)
HSCP
(physics) Heavy Stable Charged Particle
HSE
(safety) Occupational Health, Safety and Environment Protection
HTML
(internet) Hypertext Mark-up Language - used to specify the contents and format of a hypertext document on the WWW
HTR
HCAL trigger and readout card - location of two Half-HTR's, a top one and a bottom one, by the position of their respective FPGA's.
HTTP
(internet) HyperText Transfer Protocol - a set of instructions for communication between a server and a WWW client
HV
(detector) High Voltage
CMS.HyperNews
A web and email-based collaboration tool used widely in the BaBar and LHC Collaborations. Reference: WorkBookHelp#CMS.HyperNews

I

I2O
Intelligent Input/Output
iCMS
Main CMS information site (web pages). Reference: http://cms.cern.ch/iCMS
iCSA08
(computing, software) Initial CSA08 activities (iCSA08): CMS offline workflows to demonstrate readiness for LHC data (calibration, skims, express analyses).
IGUANA
(analysis) CMS Event Visualization: a generic Interactive Graphics and User ANAlysis software toolkit (C++). Reference: WorkBookEventDisplay#InfoSources
IGUANA CMS
(analysis) is a visualization system for CMS reconstruction and simulation (now part of CMSSW). Reference: WorkBookEventDisplay#InfoSources
Images
(general) CERN/CMS etc pictures and photos: WorkBookHelp#ImaGes
Input Module
(software) In CMSSW, a module responsible for obtaining events.
Installing CMS software on local systems
(infrastructure) WorkBookInstallingCMSSoftware
IOV
(data) Interval of Validity. For example, the range of dates for which detector conditions data is valid
IP
(physics) Interaction Point
IR
(physics) Interaction Region
ISR
(physics) Initial State Radiation
ISR
(general) Intersecting Storage Rings

J

Java
(programming) Programming Language
Jet
Narrow cone of hadrons and other particles produced by the hadronization of a quark or gluon in a particle physics or heavy ion experiment
JME POG
JetMET Physics Object Group
JTerm
January CMS wide educational workshops

K

Kerberos
(computer security) An authentication protocol

L

L1
(trigger) Level 1 (hardware) trigger.
L1A
(trigger) Level 1 Accept signal
LACS
(safety) LHC Access Control System
LASS
(safety) LHC Access Safety System
LAN
(computing) Local Area Network - used to connect computers over a short distance - e.g. in the same office/building
Large files
(computing) Working with large files: WorkBookSetComputerNode#LargeFiles
LAS
(detector) Laser Alignment System
LAS
(computing) Live Access Service
LBDS
LHC Beam Dump System
LCG
(grid) Worldwide LHC Computing Grid project (WLCG): WorkBookStartingGrid#LcG
LDAP
(computing) Lightweight Directory Access Protocol
LDT (as in EE LDT)
LED Diode Timing
LEE
Look-Elsewhere Effect: CMS.LookElsewhereEffect
CMS.LeftBar
(documentation) Using the "leftbar" facility on CMS twiki pages: WorkBookContributors#CMS.LeftBar
LFN (Logical File Name)
(computing) a site-independent name for a file. WorkBookDataSamples#LfN
LHC
Large Hadron Collider. See a timeline of possible developments in CERN Bulletin
LHCb
Large Hadron Collider beauty experiment
LHCC
(organisation) LHC experiment Committee
LHE
Les Houches events - samples made with matrix element generators (madgraph, Sherpa, Alpgen,...) where the generation is done in a separate step using the Les Houches convention
LHeC
Large Hadron-Electron Collider, a project aiming at collisions after ~2020 of 7 TeV protons/nucleons from HL-LHC with electrons from a new e-machine with the energy of ~50 GeV (e-ring option) or ~70 GeV (e-linac option), see a timeline in CERN Bulletin
LINAC2
CERN LInear hadron accelerator, provides 50 MeV Protons
Linux commands
WorkBookBasicLinux#BasicLinux
Logging in
Logical File Name (LFN)
see entry for LFN
LS
Lumi Sections
LS1
LHC Long Shutdown 1 -- up to 19? months in 2013-2014
LS2
LHC Long Shutdown 2 -- year 2018?
LS3
LHC Long Shutdown 3 -- year 2022?
LSB
(computing) Least Significant Bit
LSF
(computing) Load Sharing Facility (Batch system)
LSO
(safety) Laser Safety Officer
LTC
(Trigger) Local Trigger Control
LTEX
LHC Tunnel and Experiments Study Group: meetings
LUMI
(detector) luminosity. Reference: CMS.LumiWikiHome
LUT
(software) Look-Up Table
Lumi section
Sub-section of a run during which time the instantaneous Luminosity is unchanging. Initially this was defined as 2^20 orbits ~ 93 seconds; it was later redefined to be 2^18 orbits ~ 23.3 seconds. Unit of accounting for integrated luminosity. Production data files will contain one or many whole luminosity sections.
LV
(general) Low Voltage
LVPS
Low Voltage Power Supply
LXR
(computing/documentation) Linux Cross Reference. Used, for example, to produce a cross-referenced display of the CMS source code. References: WorkBookHelp#LxR, http://cmslxr.fnal.gov.lxr

M

M&O
(organisation) Maintenance and Operation
M&O-A
(organisation) Maintenance and Operation Funds, category A (contributed by Funding Agencies to the experiment)
M&O-B
(organisation) Maintenance and Operation Funds, category B (contributed by Funding Agencies to individual sub-detector projects)
MAB (Module pour Alignement de Barril)
Carbon-fibre structures where videocameras (on some of them ASPDs and DCOPs, too) are installed in order to be able to perform the hardware alignment of the DT chambers. There are 36 such modules installed on the CMS Barrel.
MAD
(safety) Material Access Device
MadEvent
the program produced by MadGraph to integrate the cross-section of the given process and produce unweighted events in the Les Houches format. Reference: SWGuideMadGraphInterface
MadGraph
a matrix element generator that generates amplitudes for relevant subprocesses of specified particle physics interactions. Reference: SWGuideMadGraphInterface
MadGraphInterface
SWGuideMadGraphInterface
Mailing Lists
WorkBookHelp#MailingLists
MAO
(detector) CAEN A3486 ACDC power converter (380V 3-phase to 48V dc) are also called MAOs. This name has been given by the CAEN engineers.
Maraton
Low voltage for the CSCs and peripheral crates is supplied by a MARATON power supply, which provides two lines to the CSC's junction box: 6 V DC and 7 V DC, and two lines to the peripheral crates: 4.5 V DC at 40 A and 6.5 V DC at 10 A.
MB
Minimum Bias
MB
(organisation) Management Board
MBUE
Minimum Bias Underlying Event
MC
(computing/general) Monte Carlo simulation
MCS
(safety) Magnet Control System
MD
(LHC) Machine Development
ME
Prefix designating the Muon End Cap sub-system, EMU, CSC
Meeting Agendas
(organisation) [WorkBookHelp#AgendaM]]
Meetings
WorkBookHelp#MeetingS
Message Logger
WorkBookSimDigi#ConfigOutput
MET
(physics) Missing Transverse Energy
MIP
(detector) Minimum Ionising Particle
Minicrate
(detector) DT on-detector electronics (one minicrate per DT chamber hosts front-end, readout and trigger electronics)
MMM - My Mail and More
WorkBookHelp#MmM
MoA
(organisation) Memorandum of Agreement, the document describing the service work obligations of Institutes and Members toward the experiment
MOF-A
(organisation) Maintenance and Operation Funds, category A (contributed by Funding Agencies to the experiment)
MOF-B
(organisation) Maintenance and Operation Funds, category B (contributed by Funding Agencies to individual sub-detector projects)
Module
An event-processing element, a plugin (C++ class) to the CMSSW executable. All modules derive from one of the three worker base classes: EDProducer, EDFilter or EDAnalyzer.
Module Label
In CMSSW, a "human friendly" string that acts as a unique identifier (within a job) used for EDProducts created by the module configured by this label. Changing this label within a job will spawn a new module.
Monte Carlo Generators
see entry for event generation
MoU
Memorandum of Understanding
MPC
Muon Port Card, CSC peripheral crate electronics board, 1 per pcrate
MPI
(physics) Multiple Parton Interactions (in hadron-hadron and other collisions)
MRH
(calibration) Multi-Run Harvesting
MSS
(safety) Magnet Safety System
MSSM
Minimal SuperSymetric Model
MTCC
(experiment) Magnet Test and Cosmic Challenge. References: CMS.CMSComputingForMTCC , CMS NOTE 2007/005
MVA
(analysis) Multivariate Data Analysis
MWGR
middle week global run

N

NEG
Non-Evaporable Getter -- a powder used in NEG pumps;
also an abbreviation for a NEG pump
NGI National Grid Initiative
a project in one or few single countries to run a computing grid infrastructure
NICE
cern.ch email system. This password is used across several CERN computing. NICE Services.

O

O&C
(organisation) Offline and Computing
ODH
(safety) Oxygen Deficiency Hazard
Online WorkBook
CMS Online/Shifter's WorkBook: CMS.MtccWB
OMDS
(databases) Online Master Data Storage
OMS
Online Monitoring Service
OO
Object Oriented (Software)
OPFC
Power Factor Corrector module, part of the Maraton LVPS system
ORCA
deprecated CMS software for digitisation of simulated electronics response (for Monte Carlo events) and reconstruction and analysis (for real and MC events)
ORCON
(databases) Offline Reconstruction Conditions DB at Online, used by CMSSW applications at P5 (HLT, DQM)
ORCOFF
(databases) Offline Reconstruction Conditions DB at Offline, used by CMSSW applications outside P5
ORM
Offline Run Manager
OS
Operating System
OS
(physics) Oppositely-Signed (physics objects of opposite electric charge)
OSCAR
deprecated CMS software for running generation and GEANT4 detector simulation of Monte Carlo events
OSG
(grid) Open Science Grid
Output Module
Reads data from the Event, and once all paths have been executed, stores the output to external media. An example is PoolOutputModule, which writes data to a standard CMS format ROOT file
O2O
Online-to-Offline

P

PA
CMS.ProdAgent, a tool for submitting jobs for large mass production.
PACE
Preshower Analogue CMS Electronics - the front-end chip designed for the CMS Preshower project. It comprises two separate chips: Delta (a 32-channel pre-amp and switchable-gain shaper) and PACE-AM (32 channel, 192-cell deep analogue memory with multiplexed output of 3 consecutive cells for every level-1 trigger received)
PAD
(safety) Personnel Access Devise
PADA
(computing) Processing And Data Access Task Force
PADC
(detector) Pressure ADC board
PAG
(organisation) Physics Analysis Group
Parameter Set
A collection of name/value pairs used to configure an element in a framework application.
Parentage
In CMSSW, a vector of the unique identifiers of the EDProducts used as inputs for this bit of reconstruction.
Particle Candidates
Particle gun (simulations)
WorkBookGeneration#SampleConfig
PAS
(analysis) Physics Analysis Summary, a public list of CMS PASes
PAT
(analysis) Physics Analysis Toolkit WorkBookPAT
PAT Glossary
(analysis) Glossary of commonly used PAT expressions WorkBookPATGlossary
Path
The user's expression of requirements regarding which modules (including their configurations) make up a single high-level trigger. (Also a listing of directory areas that the system should search to find user executables and files.)
PAW
Physics Analysis Workstation (Fortran-based legacy data analysis package)
PBS
Portable Batch System
PC
Publication Committee
PCL
(calibration) Prompt Calibration Loop
PCMB
Peripheral Crate Monitor Board - plugs into the CSC system pcrate CRB
pcrate
Peripheral Crate, CSC off-chamber front end electronics crate
PD or PDS
(data) Primary Data Sets
PdmV
(organisation) Physics Data/MC Validation -- a group within the PPD Project
People Search
WorkBookHelp#SearcHingCERN
peripheral crate
CSC off-chamber front end electronics crate
PF
(physics) Particle Flow algorithm (algorithm for identification of hadronically decaying taus on the level of individual and unique particles)
PFG
prompt feedback group
PFN
Physical File Name: site-dependent name for a file. Reference: WorkBookDataSamples#PfN
PG
(detector) Power Group
PhEDEx
Physics Experiment Data Export (data transfer and placement system) - moves data around CMS. Reference: CMS.PhEDEx
Phone conferences
WorkBookHelp#PhoneConf
Phone numbers search
CERN phone directory: WorkBookHelp#SearcHingCERN
Photos
CERN/CMS etc pictures and photos: WorkBookHelp#ImaGes
Physical File Name (PFN)
site-dependent name for a file: WorkBookDataSamples#PfN
Pictures
CERN/CMS etc pictures and photos: WorkBookHelp#ImaGes
Pile-up (PU)
Pile-up occurs when the readout of a particle detector includes information from more than one event. This specifically refers to cases where there are other (background) collisions somewhere within a timing window around the signal collision.
PInG
(organisation) Physics Interest Group, within the Heavy-Ion PAG
PLL
a circuit generating an output clock whose frequency is the same of an input "reference" clock and its phase is related to the reference clock phase
PLT
(detector) Pixel Luminosity Telescope; part of the BRIL sub-system.
PMT
Photo multiplier tube
PN (as in ECAL PN)
PIN Diode
POG
(organisation) Physics Object Group
POPULARITY SERVICE
Popularity of the DataTier in terms of # Accesses, CPU time and Users*day, in a specific time window - popularity
POOL
(data) Pool Of persistent Objects for Lhc (Data management) implements a common persistency framework for the LHC Computing Grid (LCG) application area. POOL can store multi-Petabyte experiment data and metadata in a distributed and grid enabled way, providing navigational access to distributed data without exposing details of the particular storage technology. Reference: http://pool.cern.ch/
PPD
(organisation) Physics Performance & Dataset Project (home page)
PPS
(detector) Precision Proton Spectrometer. Reference: https://cds.cern.ch/record/1753795
Preselection
??
Printing WorkBook pages and chapters
WorkBookPrintable
Provenance (of a CMSSW EDProduct)
Collectively, the information that allows users to unambiguously identify how each reconstruction result was produced. Each EDProduct is associated with a provenance object that records this information. Also see WorkBookMoreOnCMSSWFramework
PFN
Physical File Name - site-dependent name for a file.
PKAM
'Previously Known As Monsters': Events with exceptionally high occupancy in the pixel detector (see this link for the acronym definition).
PRS
(organisation) (deprecated) Physics Reconstruction and Selection organisational structure - PRS is split into two top-level groups covering the detector and analysis
Pset
(software) Parameter Set
PSC
(detector) Power Supply Controller
PSI
PVSS SOAP Interface
PSU
(detector) Power Supply Unit
PTC
(trigger) Partition Controler
PU
Pile-up
PVSS
(software) Prozessvisualisierungs- und Steuerungssystem (Process visualization and control system)
PV
(physics) Primary Vertex (i.e. the interaction point)
PVT
Physics Validation Team
PYTHIA Event Generator
(computing) A program for generation of high-energy physics events. Reference: WorkBookGeneration#PythiA
Python
(programming) An interpreted, interactive, object-oriented, open-source programming languange

Q

QCD
(physics) Quantum Chromo-Dynamics
QED
(physics) Quantum Electro-Dynamics
QF
Quality Flag
QIE
HCAL charge integrator and encoder
QPLL
(detector) a Quartz crystal based Phase-Locked Loop. The device function is to act as a jitter-filter for clock signals operating synchronously with the LHC bunch-crossing clock. See QPLL home page
QWG
Quarkonium Working Group

R

RA
(physics) Reference Analysis groups (may be SUSY specific)
RAMSES
(safety) RAdiation Monitoring System for the Environment and Safety
RAW
(data) Raw Data event format. Reference: WorkBookDataFormats#EvenT
RB
Resource Broker (Grid)
RBX
Readout BoX
RC
Replica Catalog (Grid)
RCMS
Run Control and Monitoring System
RCT
Regional Calorimeter Trigger (part of the L1 trigger). Reference: SWguideRegionalCaloTrigger
RDBMS
Relation Database Management System
RECO
Data after reconstruction. RECO is a CMSSW Data Format containing the relevant output of reconstruction. It is derived from RAW data and provides access to reconstructed physics objects for physics analysis in a convenient format. (more information: WorkBookDataFormats#RecO, SWGuideRecoDataFormat, REO)
Reconstructed data
see entry for RECO
Reconstructor
A module whose primary purpose is to perform some step of reconstruction and to place the result into the Event.
Reference Manual
Generated by DoxyGeN (not part of the CMS Offline WorkBook): http://cmsdoc.cern.ch/Releases/CMSSW/latest_nightly/doc/html/
Release Validation Samples
(analysis) WorkBookDataSamples#RvS
Remote Site
(computing/infrastructure) Working from computer sites outside CERN: WorkBookRemoteSiteSpecifics
REX
(safety) Retour d'EXperience (lessons learnt)
RF
Radiofrequency
RF2TTC
Radio-Frequency (group) to Trigger Timing and Control format conversion
RFIO
(computing) Remote File I/O
RFM
Run Field Manager
RFRXD
RFRX (or maybe better RFRx), means it's a Radio-Frequency receiver (RX=receiver). The second part, the D, means the digital version of the board (i.e. the second generation, the fist was analog)
RHEL
(computing) Redhat Enterprise Linux
RLS
(grid) Replica Location Service
RIO
(analysis) Reconstruction Input Object
ROB
(computing) Read-Out Buffer
ROC
(experiment) Read-Out Chip
ROC
Remote Operations Center at FNAL
ROD
(computing) Read-Out Driver
RoI
(analysis) Region of Interest
RooStats
(analysis) a project to create statistical tools built on top of RooFit and distributed in ROOT. It is a joint project between the LHC experiments and the ROOT team. Reference: https://twiki.cern.ch/twiki/bin/view/RooStats/WebHome
RooStatsCms
(analysis) a CMS-specific extension to the RooStats project. Reference: SWGuideRooStatsCms
ROOT
(computing/analysis) A class library / application for data analysis. Reference: WorkBookBasicROOT
RP
(experiment) Roman Pot: movable beam-pipe insertion dedicated to host detectors for measuring protons scattered to very small angles
RPC
(experiment) Resistive Plate Chamber
RPE
(safety) RadioProtection Expert
RR
(computing) Run Registry
RRB
(organisation) Resources Review Board
RS
(physics) Randall-Sundrum: RS model, RS graviton
RSL
(grid) Resource Specification Language
RSO
(safety) Radiation Safety Officer
RTAG
(grid) Requirements Technical Assessment Group (LCG)
RU
(DAQ) Readout Unit

S

SC
(data) Super Cluster
SCA
(detector) Switched Capacitor Array (in CSC front-end readout electronics)
SCAL
(detector) The online Scalers subsystem provides a way to introduce asynchronous data into the synchronous CMS data acquistion stream. The data injected into the data stream are: Level 1 Gobal Trigger counters, Luminosity counters, DCS subsystem voltage status, magnet currrent and temperature, and the synchronous history of the prior four L1 accept bunch crossing and orbit numbers. The CMSSW package DataFormats/Scalers has DIGI class files produced by the SCAL. SCAL also provides a number of monitoring and recording functions, such as writing Trigger and Luminosity rates into the online database, and receiving and recording LHC state changes through an LHC GMT (General Machine Timing) serial cable interface (see CmsLhcGmt for details). SCAL detects such events as the beginning and ending of LHC fills and records them as such in the Run Time Logger database; to assist in operational efficiency calculations, SCAL detects the absence of L1 triggers in excess of 93 seconds and records downtime in the same database.

Scheduled Application
In CMSSW, a style of application that is similar to the CDF and D0 trigger and reconstruction frameworks; more "linear" than the scheduled style. A scheduled application is configured by specifying a module instance path through which the event will flow.
ScheduleBuilder
schedules a set of modules for execution
ScheduleExecutor
invokes modules
SCR
(safety) Safety Control Room (Fire Brigade (FB), on the Meyrin site, b. 65)
SCRAM
Source Configuration, Release, And Management: a software tool responsible for building framework applications and also making sure that all the necessary shared libraries are available. Reference: WorkBookScramV1Intro
SCT
Semiconductor Tracker (Inner Detector)
SCX
(safety) Surface Control eXperiment building
SD
(physics) Single Diffractive events; (CMSSW) Secondary Dataset
SDP
Software Development Process
SDPV
Software Detector Physics Validation
SDO
Simulation Data Objects
SE
Storage Element (Grid)
SEAL
The Shared Environment for Applications at LHC, which provides common core and services (such as system, utility, framework, and mathematics) libraries for LCG applications in order to improve their coherency. Refer to the project seal for documentation, releases, and other details. Workbook reference: SWGuideDeclarePlugins
Searching
Searching for info at CERN (keywords, people, phone numbers, buildings, ...): WorkBookHelp#SearcHingCERN
Segment (in the muon chamber)
linear fit of the hits within a single chamber. It is the basic brick for the STA and TM building.
Selector
A predicate used to identify interesting EDProducts. It does so by examining the Provenance associated with that EDProduct. It encapsulates the user's requirements (i.e., features of interest) for products.
SEU
(detector) Single Event Upset -- (?) a failure of electronics induced by a single particle interaction
SGE
Sun Grid Engine (Batch Job System)
Shifter's WorkBook
see entry for Online WorkBook
SI2K
SpecInt2000 (CPU Benchmark)
SIM
Simulated Data (RAW Format)/SIMulated hits. Reference:WorkBookDataFormats
Simulation
Detector Simulation: WorkBookSimDigi#DetSim
Simulator (detector simulation of generated events)
The CMSSW simulation code, based on Geant4 concepts, is configured with CMS-specific information as to the detector geometry and materials, and knowledge of how various particles of given characteristics interact with the materials. The simulator takes input from a generated event, processes it, and writes back to the event a new (hit) container for each subdetector. In each of these containers it writes the position and energy of the virtual hits as seen by that subdetector.
SiPM
silicon photomultiplier (also called GAPD)
SLB
Synchronization and Link Board
SLC3
Scientific Linux CERN 3 operating system
SLC5
Scientific Linux CERN 5 operating system
SLIMOS
(safety) Shift Leader In Matters of Safety
SLHC
(detector) Super LHC
S-LINK
simple link interface developed at CERN
S-LINK64
64 bit S-LINK used in CMS
skimming
running selection criteria over a collection of events and writing only selected events to a new, and therefore smaller, file. This is used to speed up analysis jobs by producing a smaller sample of more-likely useful events to run over.
SM
(physics) Standard Model
SM
(data) Storage Manager
SMP PAG
Standard Model Physics Analysis Group
SMPS
(data) Storage Manager Proxy Server
soup
mixtures of different physics processes in a simulated event sample
Source (for Event Generation)
A source is a module that can put generated data into an event in memory from where other modules can access it on-the-fly. There are generator sources (e.g. Pythia or single particle gun) and input sources that recreate the event in memory from its ROOT file.
Source Configuration, Release And Management tool (SCRAM)
WorkBookScramV1Intro
Source Module
Reads in an Event from a ROOT file or generates an Event for Monte Carlo, gives the Event status information (such as Event number), and can add data directly or set up a call-back system to retrieve the data on the first request. Examples include the DaqSource, which reads in Events from the global DAQ, and the PoolSource, which reads Events from a ROOT file.
Spigot
(detector) One of 15 input sockets on an HCAL DCC. Commuicates to one Half-HTR.
SRM
Storage Resource Manager (Grid)
SS
(physics) Same-Signed (physics objects of same electric charge)
STA
Stand alone muon. Track fit in the muon chambers. It involves more than a chamber at a time.
Statistics committee
(data analysis) forms recommendations on statistical issues identified in CMS physics analyses, etc. see StatisticsCommittee
STL
Standard Template Library (C++)
Summary
summary of changes to WorkBook pages: WorkBookSummary
SUSY
(physics) Super Symmetry
SVS
Software Validation Suite (SDP Validation)
SVX
Secondary Vertex

T

TAG
Event-level metadata. Very brief event summary data. Reference: WorkBookDataFormats#EvenT
TaNC
(physics) Tau Neural Classifier (neural net algorithm for reconstructing hadronically decaying taus)
TB
Generally refers to Test Beam
TC
  • (software) Tag Collector
  • Technical Coordinator
TCC
Trigger Concentrator Card (detector ECAL) - VME modules that generate the ECAL Trigger Primitives in conjunction with the ECAL Front-End boards. They come in two flavors ie EBTCC (or TCC68, this type has 68 inputs) for the barrel part or EETCC (or TCC48, this type has 48 inputs) for the endcap parts. There are 36 EBTCC and 72 EETCC installed in the ECAL Off Detector Electronics crates.
TCDS
Timing and Control Distribution System
TCP/IP
network Transmission Control Protocol / Internet Protocol
TCS
Trigger Control System
TDC
Time to Digital Converter - a very fast timer
TDPC
(safety) Total Discharge with the Power Converter (inverter mode, current ramped down to zero)
TDR
(documents) Technical Design Report
TGC
Triple Gauge Couplings
TEC
(detector) CMS Tracker End Cap
Telephone conferences
WorkBookHelp#PhoneConf
TFB
Tracker Finance Board
TFC
(detector)
TIB
(detector) CMS Tracker Inner Barrel
TIB
Tracker Institution Board
TID
(detector) Tracker Inner Disks
Tiered Architecture
(computing/infrastructure) The structure used by the computing centres used by CMS around the world. The tiered architecture functions as a single coherent system with three levels that provide different resources and services. Reference: WorkBookComputingModel#TieRs
Tier0 Computing Centre
(computing/infrastructure) This is the first computing tier of the CMS model, and is based at CERN. It deals with raw data - storage, analysis, processing. It runs prompt reconstruction, classifies data into ~50 event streams, and distributes the data among tier 1 sites. Reference: WorkBookComputingModel#TierZero
Tier1 Computing Centre
(computing/infrastructure) Major computing sites that have custodial responsibility for a defined part of the data. Tier1s provide substantial CPU power for re-reconstruction, skimming, calibration and other data-intensive analysis tasks. It also distributes reconstructed data sets to its associated Tier 2 sites. Reference: WorkBookComputingModel#TierOne
Tier2 Computing Centre
(computing/infrastructure) Smaller computing centres with substantial CPU resources that are available for user analysis, calibration studies and Monte Carlo production. They obtain real data from Tier1 sites, and send generated Monte Carlo samples to Tier1s for secure storage. Reference: WorkBookComputingModel#TierTwo
TK
(detector) CMS tracking system
TM
Tracker muon. Track in the tracker with matched segments in the muon system (the so-called inside-out approach).
TMB
Trigger Mother Board, CSC peripheral crate electronics board, 9 per pcrate
TMI
(organisation / trigger) Trigger Menu Integration group within the Trigger Studies Group (TSG). А.k.a. the Online Operations group. Since the beginning of Run 2 it has been superseded by FOG.
TOB
(detector) CMS Tracker Outer Barrel
TOF
(physics/detector) Time Of Flight
TOTEM
(physics/detector) TOTal Elastic and diffractive cross section Measurement - TOTEM Experiment. TOTEM has been installed near the point where protons collide in the center of the CMS detector. It will complement the results obtained by the CMS detector and uses 'Roman pots'.
TP
(detector) Trigger Primitive
TPG
(detector) Trigger Primitive Generator
TPO
Tracker Project Office
TPS
Trigger Performance and Strategy Working Group, aiming at the development of long-range strategies for the CMS Upgrade Program in triggering (concept Mar 2012)
Trac
Trac is a part of CERN Central SVN Service
Track Reconstruction
WorkBookTrackAnalysis
TriDAS
(trigger) Trigger and Data Acquisition System: the trigger task is to select the most interesting events. Reference: CMS.TriDASWikiHome The first level trigger is the hardware trigger, which reduces the event rate from 40 Mhz to O(100)kHz. The subsequent HLT further selects events to yield an output rate of a O(100)Hz. The TriDAS makes events available to the offline Tier0 Centre. See also: WorkBookHLTTutorial
Trg
Trigger
Trigger
Trigger is combination of hardware and software system that uses certain criteria (based on physics algorithms) to rapidly decide to keep(record) or drop a proton-proton collision event in the CMS detector. Each physics group (SUSY, Higgs, Exotica etc. ) would like to trigger on events interesting to their physics hence leading to different trigger paths. $ Trigger path: A trigger path is a sequence of CMSSW modules which ultimately makes a boolean decision to keep or drop an event. Also see definition of a Trigger.
TRK
tracker
Troubleshooting
WorkBookTroubleShooting
TS
(LHC) Technical Stop
TSG
(trigger) Trigger Studies Group
TTC
(detector) Trigger Timing and Control
TTCci
(detector) TTC CMS interface
TTCex
(detector) TTC encoder/transmitter
TTS
Trigger Throttle System
TUPO
Tracker Upgrade Project Office
TURL
(grid) Transfer URL
TUSC
Tracker Upgrade Steering Committee
Twiki

U

UE
Underlying Event
Unscheduled Application
In CMSSW, a style of application that supports reconstruction on demand. An unscheduled application may be configured in a few ways: selecting top-level EDProducers, high level triggers, an analysis module, or some combination of these.
UI
User Interface: grid, computing
URL
Universal Resource Locator (Web or Grid)
USC55
(safety) Underground Service Cavern at LHC Point 5
User Support and help
(computing) http://cms.cern.ch/iCMS/jsp/page.jsp?mode=cms&action=url&urlkey=CMS_US
User's Office FAQ
(general) http://ph-dep-usersoffice.web.cern.ch/ph-dep-UsersOffice/FAQ%27s.html
UXC55
(safety) Underground eXperimental Cavern at LHC Point 5

V

VBF
(physics) Vector Boson Fusion
VCC
VME Crate Controller - CSC peripheral crate electronics board, 1 per pcrate
VDC
(detector) Velocity Drift Chamber
VDT
(software) Virtual Data Toolkit. Reference: http://vdt.cs.wisc.edu/
Victor
- Site Cleaning Monitoring interface - Victor
Vis (.vis file extension)
This is the file extension of the FROG file containing events data.
Visualisation
The CMS Event Display is IGUANACMS: WorkBookEventDisplay
VME
Versa Module Europa bus
VO
Virtual Organization (Grid)
VOMS
Virtual Organization Membership Service (Grid)
VOMRS Virtual Organization Memebership Registration Service (Grid)
an interface to VOMS to manage applications by VO members
VPT
(detector) Vacuum Phototriode - A single stage, magnetic field tolerant phototube, deployed in the endcaps of the ECAL
VRVS
(deprecated) Virtual Room Video Conference System - internet-based meeting tool. See also entry for EVO. Reference: WorkBookHelp#EvO

W

WAN
Wide Area Network
WBS
(planning) Work Breakdown Structure
WBM
CMS Online Web Based Monitoring is a suite of web based tools used for monitoring the online real-time and historical status of the CMS detector, trigger, and data acquisition. See the WBM link at http://cern.ch/cmswbm or at http://cmswbm.cms if you are inside the P5 network.
Web pages
Useful CERN/CMS web pages: WorkBookHelp#MainWeb
WGM
Weekly General Meeting. See the list of WGMs in Indico .
WIMP
(physics) weakly interacting massive particle, wikipedia
WLCG
Worldwide LHC Computing Grid project: WorkBookStartingGrid#LcG
WMS
Work Management System (Grid) - manages remote jobs
WN
Worker Node (Grid)
WMAgent
collection of libraries and components that provide a grid workload management system. It is written in python and interacts with multiple grid systems. WMAgent

X

XDAQ
the CMS Online software platform -- a software platform designed for the development of distributed data acquisition systems. See project page .
XC
(meeting) Cross Coordination
XEB
Extended Executive Board
XMAS
XDAQ Monitoring and Alarming System
XML
Extensible Markup Language
xyz-coordinates
(CMSConventions) Axes according to CMS IN 2000/054: X points towards the center of LHC ring, Y -- upwards, Z = X × Y

Y

YB
(detector) Yoke Barrel
YETS
Year-End Technical Stop

Z

ZDC
(detector) Zero Degree Calorimeter. Reference: CMS.ZDCWikiHome
ZEBRA
Legacy data management system


-- LucasTaylor - 27 Nov 2006 (reviewed and revised complete glossary)
-- JennyWilliams - 23 Nov 2007 (combined with WorkBook Index and CMSAcronyms and deleted index)

Responsible: KatiLassilaPerini and SudhirMalik
Last reviewed by: LucasTaylor - 27 Nov 2006

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Topic revision: r224 - 2022-12-16 - TamasAlmosVami


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