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<title>Glossary</title>
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<h2>Glossary</h2>
<dl>
<dt>BR</dt>
<dd>Beam Remnants; not much used since it may be confused with
Branching Ratio</dd>
<dt>BSM</dt>
<dd>Beyond-the-Standard-Model physics, as a generic term for anything
not contained within the SM</dd>
<dt>FSR</dt>
<dd>Final-State Radiation, implemented in terms of timelike showers</dd>
<dt>LHA</dt>
<dd>Les Houches Accord for user processes, describing which process-level
information should be stored to allow further showering and hadronization
of "skeleton" hard processes</dd>
<dt>LHAPDF</dt>
<dd>Les Houches Accord Parton Distribution Functions, originally a standard
format for defining PDF's and later a library with such PDF's</dd>
<dt>LHEF</dt>
<dd>Les Houches Event File(s), a file format for storing LHA process and
event information</dd>
<dt>ISR</dt>
<dd>Initial-State Radiation, implemented in terms of spacelike showers</dd>
<dt>MPI</dt>
<dd>Multiparton Interactions, i.e. several (more or less) independent
parton-parton subcollisions as part of a hadron-hadron event (previously
called MI for multiple interactions)</dd>
<dt>MSSM</dt>
<dd>Minimal Supersymmetric extension of the Standard Model</dd>
<dt>PDF</dt>
<dd>Parton Distribution Function (alternatively Parton Density
Function)</dd>
<dt>PDG code</dt>
<dd>a scheme for assigning unique integers, particle identity codes,
to known and hypothetical particles; code rules and tables are published
in the RPP (see below).</dd>
<dt>pileup</dt>
<dd>several hadron-hadron collisions in a bunch crossing; not to
be confused with MPI</dd>
<dt>RPP</dt>
<dd>Review of Particle Physics, the biannual review by the ParticleData Group
(PDG) from which many Standard-Model parameter values and much particle data
has been taken (but, given the poor data on many hadron resonances, a lot of
extra (guess)work is needed)</dd>
<dt>setting</dt>
<dd>collectively used to denote all the boolean <code>flag</code>,
integer <code>mode</code>, double-precision <code>parm</code>
and string <code>word</code> variables that can be set by the user
to steer the behaviour of a run; normally particle data are considered
separately but clearly are closely related</dd>
<dt>SLHA</dt>
<dd>SUSY Les Houches Accord for interchange of mass and coupling information
in SUSY scenarios, via a well-defined file format</dd>
<dt>SM</dt>
<dd>the Standard Model of particle physics</dd>
<dt>SUSY</dt>
<dd>SUperSYmmetry</dd>
<dt>units</dt>
<dd>Normal PYTHIA input, internal operations and output is based on a set of
standard units, such as:
<br/>GeV for all energies, momenta and masses, always with <i>c = 1</i>;
<br/>mm for all distances and mm/<i>c</i> for all times,
so that again they match for <i>c = 1</i>;
<br/>mb for all cross sections (but input or output via the Les Houches
Accord takes into account that the unit there is pb)
</dd>
</dl>
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