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1<html>
2<head>
3<title>Jet Finders</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>Jet Finders</h2>
10
11<code>Pythia</code> comes with three <a href="EventAnalysis.html" target="page">built-in
12jet finders</a>, <code>ClusterJet</code> for <i>e^+e^-</i> events
13and <code>SlowJet</code> and <code>CellJet</code>for hadron collider ones.
14Especially the latter is not so well matched to the standards of its field,
15however. (But it is closely related to the anti-<i>kT</i> algorithm,
16so is also not completely disconnected [<a href="Bibliography.html" target="page">Cac08</a>].) 
17<code>SlowJet</code> can do jet finding according to the current-day
18<i>kT</i>, Cambridge/Aachen and anti-<i>kT</i> algorithms but,
19as the name indicates, is is rather slow, especially when compared with
20the <code>FastJet</code> alternative.
21
22<h3>FastJet</h3>
23
24For realistic jet studies the <code>FastJet</code> package
25[<a href="Bibliography.html" target="page">Cac06</a>] has become a standard. Several different
26jet options are available, such as <i>kT</i>,
27Cambridge/Aachen, anti-<i>kT</i> and SISCone.
28
29<p/>
30Linking to <code>FastJet</code> is foreseen in the configure
31file in the <code>examples</code> subdirectory, and the
32<code>main71.cc</code> and <code>main72.cc</code> programs contain
33examples how it can be used with <code>Pythia</code> events.
34
35<p/>
36The latter program makes use of the <code>include/FastJet3.h</code>
37header file, contributed by Gavin Salam. This allows simple input
38of a <code>Pythia</code> particle into a <code>FastJet</code> one,
39either retaining only the four-momentum or the full particle information.
40Thereby more sophisticated selectors become possible at the
41<code>FastJet</code> level.
42
43</body>
44</html>
45
46<!-- Copyright (C) 2012 Torbjorn Sjostrand -->
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