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10 lines
611 B
10 lines
611 B
\midheading{$t \bar{t}$ production mediated by $Z/\gamma^*$-boson exchange, process 36}
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These processes represent the production of a virtual $Z$ boson or photon
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which subsequently decays into $t \bar{t}$.
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The leptonic decays of the top quarks are included.
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Switching {\tt zerowidth} from {\tt .true.} to {\tt .false.} only affects
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the $W$ bosons from the top quark decay.
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Note that {\tt m34min > 0} is obligatory due to the inclusion of the
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virtual photon diagrams. The calculation may be only be performed at LO.
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This is a small contribution, but in $p\bar{p}$-collisions gives a forward backward asymmetry.
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