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29 lines
1.4 KiB
29 lines
1.4 KiB
\midheading{$WH$ production, processes 91-100, 900}
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\label{subsec:wh}
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This process can be calculated at LO, NLO, and NNLO.
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These processes represent the production of a $W$ boson which subsequently
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decays leptonically, in association with a Standard Model Higgs boson that
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decays into a tau pair ({\tt nproc=91, 96}),
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decays into a $b$-quark pair ({\tt nproc=92, 97}),
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a pair of photons ({\tt nproc=93, 98}),
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or a pair of $W$-bosons ({\tt nproc=94, 99}),
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a pair of $Z$ bosons ({\tt nproc=95, 100}).
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Note that in the cases of Higgs decay to $W$,($Z$) pairs,
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below the $W$,($Z$) pair threshold
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one of the $W$,($Z$) bosons is virtual
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and therefore one must set {\tt zerowidth=.false.}.
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The calculation may be performed at NNLO for these processes.
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Radiation from the bottom quarks in the decay, an NLO effect, is included in ({\tt nproc=920, 970}).
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\texttt{nproc=900} may be used to compute the sum over both W charges in
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one run (with the decay products 3 and 4 representing lepton and antilepton
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respectively). This sum is performed by adjustng the CKM matrix to allow both charges of the $W$ boson.
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When {\tt removebr} is {\tt .true.}, neither the $W$ boson nor the Higgs decays.
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For more information on this
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process see refs.~\cite{Campbell:2016jau,Boughezal:2016wmq,Campbell:2022gdq}.
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NLO calculations can be performed by subtraction, zero-jettiness
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slicing and $q_T$-slicing. NNLO calculations can be performed by
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zero-jettiness slicing and $q_T$-slicing.
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