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<title>Top Processes</title>
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<h2>Top Processes</h2>
Different ways to produce top quarks, singly or in pairs.
<p/><code>flag </code><strong> Top:all </strong>
(<code>default = <strong>off</strong></code>)<br/>
Common switch for the group of top production.
<p/><code>flag </code><strong> Top:gg2ttbar </strong>
(<code>default = <strong>off</strong></code>)<br/>
Scatterings <i>g g → t tbar</i>.
Code 601.
<p/><code>flag </code><strong> Top:qqbar2ttbar </strong>
(<code>default = <strong>off</strong></code>)<br/>
Scatterings <i>q qbar → t tbar</i> by gluon exchange.
Code 602.
<p/><code>flag </code><strong> Top:qq2tq(t:W) </strong>
(<code>default = <strong>off</strong></code>)<br/>
Scatterings <i>q q' → t q''</i> by <i>t</i>-channel exchange
of a <i>W^+-</i> boson.
Code 603.
<p/><code>flag </code><strong> Top:ffbar2ttbar(s:gmZ) </strong>
(<code>default = <strong>off</strong></code>)<br/>
Scatterings <i>f fbar → t tbar</i> by <i>s</i>-channel exchange
of a <i>gamma^*/Z^0</i> boson.
Code 604.
<p/><code>flag </code><strong> Top:ffbar2tqbar(s:W) </strong>
(<code>default = <strong>off</strong></code>)<br/>
Scatterings <i>f fbar' → t q''</i> by <i>s</i>-channel exchange
of a <i>W^+-</i> boson.
Code 605.
<p/><code>flag </code><strong> Top:gmgm2ttbar </strong>
(<code>default = <strong>off</strong></code>)<br/>
Scatterings <i>gamma gamma → t tbar</i>.
Code 606.
<p/>
By default top always decays to a <i>W</i> and a down-type quark.
It is possible to switch on the <i>t → H+ b</i> decay mode.
Note that its partial width is calculated using the <i>tan(beta)</i>
value stored in <code>HiggsHchg:tanBeta</code>, so that it can be used
without having to read in a SUSY parameter file. For the <i>H+</i> to
decay also <code>Higgs:useBSM = on</code> is necessary.
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