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27 lines
1.4 KiB
27 lines
1.4 KiB
\midheading{$Ht{\bar t}$ production, processes 640--667}
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\label{subsec:htt}
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These processes represent the production of a Higgs boson in association
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with a pair of top quarks. The calculation can be performed at LO only.
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For process {\tt 640}, neither the top quarks nor the Higgs boson
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decays.
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In processes {\tt 641-647}, the top quarks are always
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produced on-shell, which is a necessity for a gauge invariant result
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from this limited set of diagrams.
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Switching {\tt zerowidth} from {\tt .true.} to {\tt .false.} only affects
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the Higgs and the $W$ bosons from the top quark decay.
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In process {\tt 641} both the top quarks decay leptonically
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and the Higgs boson decays into a pair of bottom quarks.
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Consistency with
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the simpler process ({\tt 640}) can be demonstrated by running process
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{\tt 641} with {\tt removebr} set to true.
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In process {\tt 644} the top quark decays leptonically
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and the anti-top quark decays hadronically and the Higgs boson decays into a pair of bottom quarks.
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In process {\tt 647} the anti-top quark decays leptonically
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and the top quark decays hadronically and the Higgs boson decays into a pair of bottom quarks.
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Processes {\tt 651}--{\tt 657} correspond to processes {\tt 641}--{\tt 647} but with the Higgs decaying
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to two photons.
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Processes {\tt 661}--{\tt 667} correspond to processes {\tt 641}--{\tt 647} but with the Higgs decaying
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to two $W$-bosons which subsequently decay leptonically.
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