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25 lines
1.2 KiB
25 lines
1.2 KiB
\midheading{$H+b$ production, processes 136--138}
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\label{subsec:Hb}
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These processes represent the production of a Standard Model Higgs
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boson that decays into a pair of bottom quarks,
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in association with a further bottom quark. The initial state at lowest order
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is a bottom quark and a gluon.
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The calculation may be performed at NLO, although radiation from the
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bottom quarks in the Higgs decay is not included.
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For more details on this calculation, please see Ref.~\cite{Campbell:2002zm}.
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For this process, the matrix elements are divided up into a number of
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different sub-processes, so the user must sum over these after performing
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more runs than usual. At lowest order one can proceed as normal, using
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{\tt nproc=136}. For a NLO calculation, the sequence of runs is as follows:
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\begin{itemize}
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\item Run {\tt nproc=136} with {\tt part=virt} and {\tt part=real} (or, both
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at the same time using {\tt part=tota});
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\item Run {\tt nproc=137} with {\tt part=real}.
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\end{itemize}
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The sum of these yields the cross-section with one identified $b$-quark in
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the final state. To calculate the contribution with two $b$-quarks in the
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final state, one should use {\tt nproc=138} with {\tt part=real}.
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When {\tt removebr} is {\tt .true.}, the Higgs boson does not decay.
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