source: HiSusy/trunk/Pythia8/pythia8170/htmldoc/TopProcesses.html @ 1

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first import of structure, PYTHIA8 and DELPHES
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1<html>
2<head>
3<title>Top Processes</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>Top Processes</h2>
10
11Different ways to produce top quarks, singly or in pairs.
12
13<p/><code>flag&nbsp; </code><strong> Top:all &nbsp;</strong> 
14 (<code>default = <strong>off</strong></code>)<br/>
15Common switch for the group of top production.
16 
17
18<p/><code>flag&nbsp; </code><strong> Top:gg2ttbar &nbsp;</strong> 
19 (<code>default = <strong>off</strong></code>)<br/>
20Scatterings <i>g g -> t tbar</i>.
21Code 601.
22 
23
24<p/><code>flag&nbsp; </code><strong> Top:qqbar2ttbar &nbsp;</strong> 
25 (<code>default = <strong>off</strong></code>)<br/>
26Scatterings <i>q qbar -> t tbar</i> by gluon exchange.
27Code 602.
28 
29
30<p/><code>flag&nbsp; </code><strong> Top:qq2tq(t:W) &nbsp;</strong> 
31 (<code>default = <strong>off</strong></code>)<br/>
32Scatterings <i>q q' -> t q''</i> by <i>t</i>-channel exchange
33of a <i>W^+-</i> boson.
34Code 603.
35 
36
37<p/><code>flag&nbsp; </code><strong> Top:ffbar2ttbar(s:gmZ) &nbsp;</strong> 
38 (<code>default = <strong>off</strong></code>)<br/>
39Scatterings <i>f fbar -> t tbar</i> by <i>s</i>-channel exchange
40of a <i>gamma^*/Z^0</i> boson.
41Code 604.
42 
43
44<p/><code>flag&nbsp; </code><strong> Top:ffbar2tqbar(s:W) &nbsp;</strong> 
45 (<code>default = <strong>off</strong></code>)<br/>
46Scatterings <i>f fbar' -> t q''</i> by <i>s</i>-channel exchange
47of a <i>W^+-</i> boson.
48Code 605.
49 
50
51<p/><code>flag&nbsp; </code><strong> Top:gmgm2ttbar &nbsp;</strong> 
52 (<code>default = <strong>off</strong></code>)<br/>
53Scatterings <i>gamma gamma -> t tbar</i>.
54Code 606.
55 
56
57<p/>
58By default top always decays to a <i>W</i> and a down-type quark.
59It is possible to switch on the <i>t -> H+ b</i> decay mode.
60Note that its partial width is calculated using the <i>tan(beta)</i> 
61value stored in <code>HiggsHchg:tanBeta</code>, so that it can be used
62without having to read in a SUSY parameter file. For the <i>H+</i> to
63decay also <code>Higgs:useBSM = on</code> is necessary. 
64
65</body>
66</html>
67
68<!-- Copyright (C) 2012 Torbjorn Sjostrand -->
69
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