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19 lines
1.0 KiB
19 lines
1.0 KiB
\midheading{$e^- e^+ \nu \bar \nu$ production, processes 1282, 1312, 1322}
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These processes compute cross sections relevant for the final state
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$e^- e^+ \nu \bar \nu$, i.e. an electron pair and a sum over all three
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flavours of neutrino. For muon and tau neutrinos, only $ZZ$ diagrams
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contribute. For electron neutrinos there are contributions from
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diagrams with resonant $ZZ$ propagators and resonant $WW$ propagators.
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Process {\tt 1282} only includes amplitudes containing a Higgs boson
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(c.f. processes {\tt 123} and {\tt 128}). Process {\tt 1322} only
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includes continuum (box-diagram) amplitudes (c.f. processes {\tt 127}
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and {\tt 132}). Process {\tt 1312} includes both amplitudes and the
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effects of the interference between them (c.f. processes {\tt 126} and
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{\tt 131}).
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% The effect of the interference between the $WW$ and $ZZ$
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% diagrams can be assessed by, for instance, comparing process {\tt 1282}
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% with the sum of processes {\tt 123} and {\tt 128.ELNU}.
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%
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% Event generation is not available for these processes at present.
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