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37 lines
2.0 KiB
37 lines
2.0 KiB
\midheading{$W+Q$ production in the 4FNS, processes 401--408}
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\label{subsec:wbbfilter}
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These processes represent the production of a $W$ boson and one or more jets,
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at least one of which is a $b$-quark, calculated in the 4-flavour number scheme (4FNS).
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This implies that contributions that explicitly contain a $b$-quark in the initial state
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are not included.
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These processes all use the same matrix
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elements as processes 20 and 25 (see section~\ref{subsec:wbb}), but make different
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cuts on the final state. The final state is specified by the process number and
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the value of the flag {\tt inclusive}, as shown in Table~\ref{table:wbbfilter}.
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An additional flag is hard-coded into the file {\tt src/Cuts/filterWbbmas.f} to control
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the inclusion of the 3-jet configuration, $(b,\overline b,j)$ when {\tt inclusive} is set to {\tt .true.}.
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By default, the statement {\tt veto3jets = .false.} is included in this file. If this flag is set to {\tt .true.}
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then the $(b,\overline b,j)$ contribution
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is not included in processes 401, 402, 406, 407.
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\begin{table}
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\begin{center}
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\begin{tabular}{|c|c|c|} \hline
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Process ($W^+$/$W^-$) & {\tt inclusive=.false.} & {\tt inclusive=.true.} \\
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\hline
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{\tt 401}/{\tt 406} & $(b)$ or $(\overline b)$ & + ($b,\overline b$) or ($b,j$) or ($\overline b,j$) \\
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{\tt 402}/{\tt 407} & $(B)$ & + ($B,j$) \\
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{\tt 403}/{\tt 408} & $(b,\overline b)$ & \mbox{(no extra configurations)} \\
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\hline
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\end{tabular}
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\caption{The different final states allowed in the calculation of processes 401--408. A jet containing
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both $b$ and $\overline b$ quarks is denoted by $B$ and a light (quark or gluon) jet by $j$. The inclusive
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(right-hand) column also allows the final states in the exclusive (middle) column.}
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\label{table:wbbfilter}
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\end{center}
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\end{table}
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As usual, jets may be unobserved as a result of them falling outside the $p_T$
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and rapidity ranges specified in the input file. In addition, the number of jets
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may be different from the number of partons in the matrix element calculation as
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a result of merging in the jet algorithm.
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