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21 lines
1.1 KiB
21 lines
1.1 KiB
\midheading{$Z$-boson production, processes 31--33}
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\label{subsec:zboson}
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These processes represent the production of a $Z$ boson which subsequently
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decays either into electrons ({\tt nproc=31}), neutrinos ({\tt nproc=32})
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or bottom quarks ({\tt nproc=33}). Where appropriate, the effect of a virtual
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photon is also included. As noted above, for {\tt nproc=31} and {\tt nproc=33} the constraint
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{\tt m34min > 0} is obligatory. The calculation may be performed at LO, NLO
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and NNLO~\cite{Boughezal:2016wmq,Campbell:2022gdq}
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although the NLO and NNLO calculation of process {\tt 33} does not include radiation
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from the bottom quarks (i.e.\ radiation occurs in the initial state only).
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This process can be calculated at LO, NLO, and NNLO. NLO calculations
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can be performed by subtraction, zero-jettiness slicing and
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$q_T$-slicing. NNLO calculations can be performed by zero-jettiness
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slicing and $q_T$-slicing.
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To calculate the total cross section to on-shell $Z$ bosons, we take
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process ({\tt nproc=32}), (no $\gamma^{*}$ contribution) and
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set (zerowidth=.true.) and (removebr =.true.).
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When {\tt removebr} is true in process {\tt 31}, the $Z$ boson does not decay.
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