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first import of structure, PYTHIA8 and DELPHES
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1<html>
2<head>
3<title>Glossary</title>
4<link rel="stylesheet" type="text/css" href="pythia.css"/>
5<link rel="shortcut icon" href="pythia32.gif"/>
6</head>
7<body>
8
9<h2>Glossary</h2>
10
11<dl>
12
13<dt>BR</dt>
14<dd>Beam Remnants; not much used since it may be confused with
15Branching Ratio</dd>
16
17<dt>BSM</dt>
18<dd>Beyond-the-Standard-Model physics, as a generic term for anything
19not contained within the SM</dd>
20
21<dt>FSR</dt>
22<dd>Final-State Radiation, implemented in terms of timelike showers</dd>
23
24<dt>LHA</dt>
25<dd>Les Houches Accord for user processes, describing which process-level
26information should be stored to allow further showering and hadronization
27of "skeleton" hard processes</dd>
28
29<dt>LHAPDF</dt>
30<dd>Les Houches Accord Parton Distribution Functions, originally a standard
31format for defining PDF's and later a library with such PDF's</dd>
32
33<dt>LHEF</dt>
34<dd>Les Houches Event File(s), a file format for storing LHA process and
35event information</dd>
36
37<dt>ISR</dt>
38<dd>Initial-State Radiation, implemented in terms of spacelike showers</dd>
39
40<dt>MPI</dt>
41<dd>Multiparton Interactions, i.e. several (more or less) independent
42parton-parton subcollisions as part of a hadron-hadron event (previously
43called MI for multiple interactions)</dd>
44
45<dt>MSSM</dt>
46<dd>Minimal Supersymmetric extension of the Standard Model</dd>
47
48<dt>PDF</dt>
49<dd>Parton Distribution Function (alternatively Parton Density
50Function)</dd>
51
52<dt>PDG code</dt>
53<dd>a scheme for assigning unique integers, particle identity codes,
54to known and hypothetical particles; code rules and tables are published
55in the RPP (see below).</dd>
56
57<dt>pileup</dt>
58<dd>several hadron-hadron collisions in a bunch crossing; not to
59be confused with MPI</dd>
60
61<dt>RPP</dt>
62<dd>Review of Particle Physics, the biannual review by the ParticleData Group
63(PDG) from which many Standard-Model parameter values and much particle data
64has been taken (but, given the poor data on many hadron resonances, a lot of
65extra (guess)work is needed)</dd>
66
67<dt>setting</dt>
68<dd>collectively used to denote all the boolean <code>flag</code>,
69integer <code>mode</code>, double-precision <code>parm</code>
70and string <code>word</code> variables that can be set by the user
71to steer the behaviour of a run; normally particle data are considered
72separately but clearly are closely related</dd>
73
74<dt>SLHA</dt>
75<dd>SUSY Les Houchs Accord for interchange of mass and coupling information
76in SUSY scenarios, via a well-defined file format</dd>
77
78<dt>SM</dt>
79<dd>the Standard Model of particle physics</dd>
80
81<dt>SUSY</dt>
82<dd>SUperSYmmetry</dd>
83
84<dt>units</dt>
85<dd>Normal PYTHIA input, internal operations and output is based on a set of
86standard units, such as:
87<br/>GeV for all energies, momenta and masses, always with <i>c = 1</i>;
88<br/>mm for all distances and mm/<i>c</i> for all times,
89so that again they match for <i>c = 1</i>;
90<br/>mb for all cross sections (but input or output via the Les Houches
91Accord takes into account that the unit there is pb)
92</dd>
93
94</dl>
95
96</body>
97</html>
98
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