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12 lines
857 B
12 lines
857 B
\midheading{$HH$ production, processes 601--602}
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These processes represent the production of a pair of Higgs bosons.
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The production proceeds through gluon-fusion one-loop diagrams involving loops
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of top quarks. The formulae implemented in the code are taken from ref.~\cite{Glover:1987nx},
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where the two Higgs bosons are treated as being on-shell. To enforce this
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condition, the code sets zerowidth to true, overriding the value set in the input file.
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The calculation can be performed at LO only, (i.e.\ one-loop order only).
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Two decays of the Higgs bosons are currently foreseen, although other decays can easily be implemented.
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In process {\tt 601}, one Higgs boson decays to
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a pair of $b$-quarks, and the other decays to a pair of $\tau$'s.
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In process {\tt 602}, one Higgs boson decays to
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a pair of $b$-quarks, and the other decays to a pair of photons.
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