<chapter name="Top Processes"> <h2>Top Processes</h2> Different ways to produce top quarks, singly or in pairs. <flag name="Top:all" default="off"> Common switch for the group of top production. </flag> <flag name="Top:gg2ttbar" default="off"> Scatterings <ei>g g → t tbar</ei>. Code 601. </flag> <flag name="Top:qqbar2ttbar" default="off"> Scatterings <ei>q qbar → t tbar</ei> by gluon exchange. Code 602. </flag> <flag name="Top:qq2tq(t:W)" default="off"> Scatterings <ei>q q' → t q''</ei> by <ei>t</ei>-channel exchange of a <ei>W^+-</ei> boson. Code 603. </flag> <flag name="Top:ffbar2ttbar(s:gmZ)" default="off"> Scatterings <ei>f fbar → t tbar</ei> by <ei>s</ei>-channel exchange of a <ei>gamma^*/Z^0</ei> boson. Code 604. </flag> <flag name="Top:ffbar2tqbar(s:W)" default="off"> Scatterings <ei>f fbar' → t q''</ei> by <ei>s</ei>-channel exchange of a <ei>W^+-</ei> boson. Code 605. </flag> <flag name="Top:gmgm2ttbar" default="off"> Scatterings <ei>gamma gamma → t tbar</ei>. Code 606. </flag> <p/> By default top always decays to a <ei>W</ei> and a down-type quark. It is possible to switch on the <ei>t → H+ b</ei> decay mode. Note that its partial width is calculated using the <ei>tan(beta)</ei> value stored in <code>HiggsHchg:tanBeta</code>, so that it can be used without having to read in a SUSY parameter file. For the <ei>H+</ei> to decay also <code>Higgs:useBSM = on</code> is necessary. </chapter> <!-- Copyright (C) 2014 Torbjorn Sjostrand -->