Top Processes
 
 
Different ways to produce top quarks, singly or in pairs. 
 
flag   Top:all   
 (default = off)
Common switch for the group of top production. 
   
 
flag   Top:gg2ttbar   
 (default = off)
Scatterings g g → t tbar. 
Code 601. 
   
 
flag   Top:qqbar2ttbar   
 (default = off)
Scatterings q qbar → t tbar by gluon exchange. 
Code 602. 
   
 
flag   Top:qq2tq(t:W)   
 (default = off)
Scatterings q q' → t q'' by t-channel exchange 
of a W^+- boson. 
Code 603. 
   
 
flag   Top:ffbar2ttbar(s:gmZ)   
 (default = off)
Scatterings f fbar → t tbar by s-channel exchange 
of a gamma^*/Z^0 boson. 
Code 604. 
   
 
flag   Top:ffbar2tqbar(s:W)   
 (default = off)
Scatterings f fbar' → t q'' by s-channel exchange 
of a W^+- boson. 
Code 605. 
   
 
flag   Top:gmgm2ttbar   
 (default = off)
Scatterings gamma gamma → t tbar. 
Code 606. 
   
 
flag   Top:ggm2ttbar   
 (default = off)
Scatterings g gamma → t tbar. 
Code 607 when g gamma → t tbar and 617 
when gamma g → t tbar. 
   
 
 
By default top always decays to a W and a down-type quark. 
It is possible to switch on the t → H+ b decay mode. 
Note that its partial width is calculated using the tan(beta) 
value stored in HiggsHchg:tanBeta, so that it can be used 
without having to read in a SUSY parameter file. For the H+ to 
decay also Higgs:useBSM = on is necessary.