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52 lines
3.3 KiB
52 lines
3.3 KiB
\begin{longtable}{p{1.5cm}p{12cm}}
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\hline
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\multicolumn{1}{c}{{\textbf{Section} \texttt{nnlo}}} & \multicolumn{1}{c}{{\textbf{Description}}} \\
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\hline
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\texttt{taucut} &
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Optional. This sets the value of the jettiness variable
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$\tau_{\text{cut}}$, as a multiple of the invariant mass of the Born system,
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i.e.
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\begin{equation}
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\tau_{\text{cut}} = \texttt{taucut} \times Q
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\end{equation}
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This variable separates the resolved and unresolved regions in NNLO
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calculations that use zero-jettiness. The default value results
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in total inclusive cross sections with less than $1\%$ residual cutoff effects. \\
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\texttt{tcutarray} &
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Optional. Array that specifies multiple taucut values that should be sampled
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on the fly in addition to the nominal taucut value. Both larger and smaller
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values than the nominal one can be specified, although uncertainties for
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smaller values will be large. We generally do not recommend smaller values
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than the nominal one chosen with \texttt{taucut}. Default values are chosen
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to be $2,4,8,20,40$ times the nominal choice of \texttt{taucut}. \\
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\texttt{dynamictau} &
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Optional. If \texttt{.false.}, the \texttt{taucut} value specified
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is not multiplied by the invariant mass of the Born system. Default is \texttt{.true.}. \\
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\texttt{useqt} & Flag to use $q_T$ slicing, rather than
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0-jettiness, in the calculation of NNLO contributions.
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Default is \texttt{.false.} \\
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\texttt{useGLY} & If \texttt{.true.}, implement non-local $q_T$ subtraction using formulas from Gehrmann et al.(GLY)~\cite{Gehrmann:2014yya}.
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Default is \texttt{.true.} when \texttt{useqt} is enabled. If \texttt{.false},
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implement non-local $q_T$ subtraction using formulas from Billis et al.(BEMT)~\cite{Billis:2019vxg}. \\
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\texttt{qtcut} & If \texttt{useqt} is enabled, the value of the slicing parameter, defined
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in the same way as \texttt{taucut} described above. \\
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\texttt{tauboost} & When using 0-jettiness, perform the slicing cut in the
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centre-of-mass of the color singlet system. Default is \texttt{.true.} \\
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\texttt{incpowcorr} & When using 0-jettiness, include leading power corrections
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in the below-cut calculation. Default is \texttt{.false.} \\
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\texttt{onlypowcorr} & When using 0-jettiness, only compute the power corrections
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to the below-cut calculation. Default is \texttt{.false.} \\
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\texttt{usept} & This flag has two separate uses. In a fixed-order sliciing calculation,
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e.g. {\tt part} is equal to {\tt snlo} or {\tt nnlo}, the code uses $p_T^{veto}$ slicing, rather than
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0-jettiness, in the calculation of higher-order contributions.
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In a resummed calculation, e.g. {\tt part} is equal to {\tt resNLO} or {\tt resNNLO},
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it enables the use of $p_T^{veto}$ resummation rather that $q_T$ resummation.
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In this case the value of the jet veto (\texttt{ptveto}) is set separately in the
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\texttt{resummation} block.
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Default is \texttt{.false.} \\
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\texttt{useBNR} & Implements $p_T^{veto}$ formalism using the refactorized approach of
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Ref.~\cite{Becher:2013xia}. Otherwise uses original `$B \times B \times S$' factorization
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of below-cut cross-section into beam and soft functions (that gives identical results).
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Default is \texttt{.true.} \\
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\hline
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\end{longtable}
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