N$^3$LL $q_T$ resummation for color-singlet processes in MCFM

Authors: Thomas Becher, Tobias Neumann

CuTe-MCFM is a program and framework for $q_T$ resummation at N$^3$LL accuracy for color-singlet processes based on a factorization theorem in SCET. It is fully differential in the Born kinematics and matches to large-$q_T$ fixed-order predictions in MCFM at relative order $\alpha_s^2$. It provides an efficient way to estimate uncertainties from fixed-order truncation, resummation, and parton distribution functions. In addition to $W^\pm$, $Z$ and $H$ production, also the diboson processes $\gamma\gamma, Z\gamma, ZH$ and $W^\pm H$ are available, including decays.

The program is based on the publication

We release CuTe-MCFM and MCFM as a combined code: Please refer to it as CuTe-MCFM if you use the resummation and simply as MCFM otherwise.

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A quickstart manual for CuTe-MCFM is included in the distribution in Doc/cute-mcfm.pdf. The manual for MCFM itself is included in Doc/manual.pdf. Example input files for all color-singlet processes are included in the Bin/ directory and can be used to reproduce the results in our publication.

Please feel free to contact the authors for any questions.

The implmented formalism is based on the resummation derived in SCET in the following publications:

The code CuTe resulting from these publications can be used for fully inclusive boson production (i.e. no decay of the boson and no fiducial cuts) and provides equivalent results to CuTe-MCFM.

See also the following publication for an interface of this formalism at N$^2$LL to MadGraph5_aMC@NLO: