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[u/mrichter/AliRoot.git] / PYTHIA8 / pythia8130 / xmldoc / Glossary.xml
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5ad4eb21 1<chapter name="Glossary">
2
3<h2>Glossary</h2>
4
5<dl>
6
7<dt>BR</dt>
8<dd>Beam Remnants; not much used since it may be confused with
9Branching Ratio</dd>
10
11<dt>BSM</dt>
12<dd>Beyond-the-Standard-Model physics, as a generic term for anything
13not contained within the SM</dd>
14
15<dt>FSR</dt>
16<dd>Final-State Radiation, implemented in terms of timelike showers</dd>
17
18<dt>LHA</dt>
19<dd>Les Houches Accord for user processes, describing which process-level
20information should be stored to allow further showering and hadronization
21of "skeleton" hard processes</dd>
22
23<dt>LHAPDF</dt>
24<dd>Les Houches Accord Parton Distribution Functions, originally a standard
25format for defining PDF's and later a library with such PDF's</dd>
26
27<dt>LHEF</dt>
28<dd>Les Houches Event File(s), a file format for storing LHA process and
29event information</dd>
30
31<dt>ISR</dt>
32<dd>Initial-State Radiation, implemented in terms of spacelike showers</dd>
33
34<dt>MI</dt>
35<dd>Multiple Interactions, i.e. several (more or less) independent
36parton-parton subcollisions as part of a hadron-hadron event (sometimes
37also called MPI, with P for parton or parton-parton)</dd>
38
39<dt>MSSM</dt>
40<dd>Minimal Supersymmetric extension of the Standard Model</dd>
41
42<dt>PDF</dt>
43<dd>Parton Distribution Function (alternatively Parton Density
44Function)</dd>
45
46<dt>PDG code</dt>
47<dd>a scheme for assigning unique integers, particle identity codes,
48to known and hypothetical particles; code rules and tables are published
49in the RPP (see below).</dd>
50
51<dt>pileup</dt>
52<dd>several hadron-hadron collisions in a bunch crossing; not to
53be confused with MI</dd>
54
55<dt>RPP</dt>
56<dd>Review of Particle Physics, the biannual review by the ParticleData Group
57(PDG) from which many Standard-Model parameter values and much particle data
58has been taken (but, given the poor data on many hadron resonances, a lot of
59extra (guess)work is needed)</dd>
60
61<dt>setting</dt>
62<dd>collectively used to denote all the boolean <code>flag</code>,
63integer <code>mode</code>, double-precision <code>parm</code>
64and string <code>word</code> variables that can be set by the user
65to steer the behaviour of a run; normally particle data are considered
66separately but clearly are closely related</dd>
67
68<dt>SLHA</dt>
69<dd>SUSY Les Houchs Accord for interchange of mass and coupling information
70in SUSY scenarios, via a well-defined file format</dd>
71
72<dt>SM</dt>
73<dd>the Standard Model of particle physics</dd>
74
75<dt>SUSY</dt>
76<dd>SUperSYmmetry</dd>
77
78<dt>units</dt>
79<dd>Normal PYTHIA input, internal operations and output is based on a set of
80standard units, such as:
81<br/>GeV for all energies, momenta and masses, always with <ei>c = 1</ei>;
82<br/>mm for all distances and mm/<ei>c</ei> for all times,
83so that again they match for <ei>c = 1</ei>;
84<br/>mb for all cross sections (but input or output via the Les Houches
85Accord takes into account that the unit there is pb)
86</dd>
87
88</dl>
89
90</chapter>
91
92<!-- Copyright (C) 2008 Torbjorn Sjostrand -->