3
<title>Top Processes</title>
4
<link rel="stylesheet" type="text/css" href="pythia.css"/>
5
<link rel="shortcut icon" href="pythia32.gif"/>
11
Different ways to produce top quarks, singly or in pairs.
13
<p/><code>flag </code><strong> Top:all </strong>
14
(<code>default = <strong>off</strong></code>)<br/>
15
Common switch for the group of top production.
18
<p/><code>flag </code><strong> Top:gg2ttbar </strong>
19
(<code>default = <strong>off</strong></code>)<br/>
20
Scatterings <i>g g -> t tbar</i>.
24
<p/><code>flag </code><strong> Top:qqbar2ttbar </strong>
25
(<code>default = <strong>off</strong></code>)<br/>
26
Scatterings <i>q qbar -> t tbar</i> by gluon exchange.
30
<p/><code>flag </code><strong> Top:qq2tq(t:W) </strong>
31
(<code>default = <strong>off</strong></code>)<br/>
32
Scatterings <i>q q' -> t q''</i> by <i>t</i>-channel exchange
33
of a <i>W^+-</i> boson.
37
<p/><code>flag </code><strong> Top:ffbar2ttbar(s:gmZ) </strong>
38
(<code>default = <strong>off</strong></code>)<br/>
39
Scatterings <i>f fbar -> t tbar</i> by <i>s</i>-channel exchange
40
of a <i>gamma^*/Z^0</i> boson.
44
<p/><code>flag </code><strong> Top:ffbar2tqbar(s:W) </strong>
45
(<code>default = <strong>off</strong></code>)<br/>
46
Scatterings <i>f fbar' -> t q''</i> by <i>s</i>-channel exchange
47
of a <i>W^+-</i> boson.
51
<p/><code>flag </code><strong> Top:gmgm2ttbar </strong>
52
(<code>default = <strong>off</strong></code>)<br/>
53
Scatterings <i>gamma gamma -> t tbar</i>.
58
By default top always decays to a <i>W</i> and a down-type quark.
59
It is possible to switch on the <i>t -> H+ b</i> decay mode.
60
Note that its partial width is calculated using the <i>tan(beta)</i>
61
value stored in <code>HiggsHchg:tanBeta</code>, so that it can be used
62
without having to read in a SUSY parameter file. For the <i>H+</i> to
63
decay also <code>Higgs:useBSM = on</code> is necessary.
68
<!-- Copyright (C) 2012 Torbjorn Sjostrand -->
added
removed
htmldoc/TopProcesses.html
