3 <title>Jet Finders</title>
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28 <form method='post' action='JetFinders.php'>
32 <code>Pythia</code> comes with three <?php $filepath = $_GET["filepath"];
33 echo "<a href='EventAnalysis.php?filepath=".$filepath."' target='page'>";?>built-in
34 jet finders</a>, <code>ClusterJet</code> for <i>e^+e^-</i> events
35 and <code>SlowJet</code> and <code>CellJet</code>for hadron collider ones.
36 Especially the latter is not so well matched to the standards of its field,
37 however. (But it is closely related to the anti-<i>kT</i> algorithm,
38 so is also not completely disconnected [<a href="Bibliography.php" target="page">Cac08</a>].)
39 <code>SlowJet</code> can do jet finding according to the current-day
40 <i>kT</i>, Cambridge/Aachen and anti-<i>kT</i> algorithms but,
41 as the name indicates, is is rather slow, especially when compared with
42 the <code>FastJet</code> alternative.
46 For realistic jet studies the <code>FastJet</code> package
47 [<a href="Bibliography.php" target="page">Cac06</a>] has become a standard. Several different
48 jet options are available, such as <i>kT</i>,
49 Cambridge/Aachen, anti-<i>kT</i> and SISCone.
52 Linking to <code>FastJet</code> is foreseen in the configure
53 file in the <code>examples</code> subdirectory, and the
54 <code>main71.cc</code> and <code>main72.cc</code> programs contain
55 examples how it can be used with <code>Pythia</code> events.
58 The latter program makes use of the <code>include/FastJet3.h</code>
59 header file, contributed by Gavin Salam. This allows simple input
60 of a <code>Pythia</code> particle into a <code>FastJet</code> one,
61 either retaining only the four-momentum or the full particle information.
62 Thereby more sophisticated selectors become possible at the
63 <code>FastJet</code> level.
68 <!-- Copyright (C) 2013 Torbjorn Sjostrand -->