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This page is a prototype of a glossary for Mu2e. The style of this page is taken from https://www.mediawiki.org/wiki/Manual:Glossary.

Some questions:

1. Do we need a glossary. I say yes because too many simple things are, otherwise, never properly defined.
2. Who needs to be part of this discussion?
3. What is the scope of this document?
   1. Just computing terms and put the physics and detector terms elsewhere?
   2. Computing terms plus physics and detector terms that are encountered in day to day computing work? The prototype is written like this.
   3. Do we make it more inclusive?
4. Is this the right style? If not, what is.
5. Does a link to this page belong on: Main_Page? From Computing? Other?

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This page is a glossary and acronym dictionary that covers the terms and acronyms that one will encounter when working with the Mu2e software. For acronyms specific to the Mu2e Construction Project, see MAD: The Mu2e Acronym Dictionary .

C

CCD

Core Computing Division at Fermilab. An organization with the Fermilab Computing Sector (CS).

CERN

A High Energy Physics lab in Geneva, Switzerland. See the CERN home page.

CLHEP

CLHEP: A Class Library for High Energy Physics is a 20+ year old class library that contains classes for 3-vectors, 4-vectors, Lorentz transformations, linear algebra, Random Number engines and Random Distributions. The GEANT4 simulation library makes extensive use of CLHEP. Early version of Mu2e reconstruction software also used CLHEP but this is being phased out in favor of the ROOT SMatrix package.

COMET

A competitor experiment, also building an experiment to look for Muon to Electron Conversion. Located at JPARC. See also the COMET Home Page.

CRV

The Mu2e Cosmic Ray Veto system. It is possible for a cosmic ray to interact with the Mu2e apparatus and the surrounding materials to produce a track that is indistinguishable from a conversion electron. The purpose of the CRV is to record when cosmic rays enter the detector. The CRV system tags events in which a cosmic ray has entered the Mu2e detector. During data analysis Mu2e will exclude exclude tagged events. FIXME: link to more CRV info.

CS

The Fermilab Computing Sector. See https://computing.fnal.gov

Calorimeter

The Mu2e Electromagnetic Calorimeter; one of the subsystems of the Mu2e detector. It measures the energy of photons and electrons in the energy range of interest to Mu2e. FIXME: link to more cal information.

D

Data Product

The unit of data that can be read from an art format event-data file.

Digi

A software object that represents smallest unit of raw data that is read from the experiment. Typically it contains an identifier of an electronics channel, one or two TDC values and a set of ADC values that represent a waveform. These objects are found in data products that are collections of many digi objects; examples include CaloDigiCollection, CrvDigiCollection and StrawDigiCollection. Digi objects can also be produced by the Mu2e simulation code. FIXME: do we want links to code; better would be to drop the examples and link to a more extensive writeup.

E

Event

When Mu2e is taking on-spill data, an event is all of the data associated with one proton pulse aimed at the production target. When Mu2e is taking off-spill data, an event is all of the data associated with the a fixed time period. As of March 2022, the fixed time period is 100 micro-seconds. In both cases it includes all of the raw data plus any data that is produced by processing the raw data. Events are collected into files that reside either on disk or tape.

F

FNAL

Fermi National Accelerator Lab; the full name of Fermilab. The lab has a public home page and a separate home page for employees, Users and Affliates.

H

{{Anchor|Hit|hit} Hit

Hits are created by applying calibrations to digis.

P

Product

Either a UPS Product or a Data Product; hopefully the meaning will be clear from the context. FIXME: why is Data Product not a red link.

R

ROOT

A software package for Scientific Data Analysis] developed at CERN. It is also used as the underlying technology art format event-data files. As if March 2022, Mu2e has two data analysis environments based on ROOT, #TrkAna and #Stntuple. See also: the ROOT Class Index.

U

UPS Product

A software package distributed using the UPS system; examples include the C++ compiler, art, ROOT, and GEANT4.