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32 lines
1.7 KiB
32 lines
1.7 KiB
\midheading{$t$-channel single top with an explicit $b$-quark, processes 231--240}
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\label{subsec:stopb}
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These represent calculations of the $t$-channel single top~({\tt 231}) and anti-top~({\tt 231})
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processes in a scheme with four flavours of quark in the proton, so that $b$-quarks are not present in the proton.
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The $b$-quark is instead explicitly included in the final state.
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For more details on this calculation, please see Ref.~\cite{Campbell:2009ss}.
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Processes {\tt 232} and {\tt 236} represent $t$-channel single top production in association
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with a further jet and may be calculated at LO only.
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Processes {\tt 233} and {\tt 238} are the complete four-flavour scheme $t$-channel single top production processes.
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These are therefore the processes that should be used for most physics applications.
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When one wishes to calculate observables related to the decay of the top
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quark, {\tt removebr} should be false in processes {\tt 233} and {\tt 236}.
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The LO calculation proceeds as normal. At NLO, there are two options:
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\begin{itemize}
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\item {\tt part=virt, real} or {\tt tota} : final state radiation is included
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in the production stage only
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\item {\tt part = todk} : radiation is included in the decay of the top
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quark also and the final result corresponds to the sum of real and virtual
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diagrams.
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Note that these runs automatically perform an extra integration, so
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will take a little longer.
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\end{itemize}
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Processes {\tt 234} and {\tt 239} give the extra contribution due to radiation
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in top decay. These processes are mainly of theoretical interest.
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Processes {\tt 235} and {\tt 240} are the leading order single top processes with an
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extra radiated parton. These processes do not includes jets produced in the decay process.
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