36 f(-p1)+f(-p2) Z t(ν(p3)+e+(p4)+b(p5))+t(b(p6)+e-(p7)+ν(p8))

36.1 tt production mediated by Z∕γ*-boson exchange, process 36

These processes represent the production of a virtual Z boson or photon which subsequently decays into tt. The leptonic decays of the top quarks are included. Switching zerowidth from .true. to .false. only affects the W bosons from the top quark decay. Note that m34min > 0 is obligatory due to the inclusion of the virtual photon diagrams. The calculation may be only be performed at LO. This is a small contribution, but in pp-collisions gives a forward backward asymmetry.

36.2 Plotter

nplotter_auto.f is the default plotting routine.

36.3 Example input and output file(s)

input36.ini process36.out