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Resummino

Resummino computes predictions for selected Beyond the Standard Model (BSM) processes at hadron colliders. In the framework of the Minimal Supersymmetric Standard Model (MSSM) predictions at NNLO+NNLL are available for slepton-pair and electroweakino-pair production (these processes are also available with a collinear improved version of threshold resummation for NLO+NLL); predictions at LO are available for the associated gaugino-gluino and gaugino-squark production. In general BSM models with extended gauge sectors, predictions for Z' and W' production are available at approximate NNLO+NNLL accuracy. The code is able to compute total cross sections as well as invariant-mass and transverse-momentum distributions (only for Drell-Yan-like processes). This software is open-source software under the terms of the European Union Public Licence version 1.1 or later.

Currently maintained by Juri Fiaschi in the Particle Physics Group at the University of Liverpool and Alexander Neuwirth in the Research Group of Prof. Dr. Michael Klasen at the Institut für Theoretische Physik, Universität Münster, Germany.

Prerequisites

Compilation and installation

Download and extract the source tarball and cd into it. Then you can use the following commands to compile and install the program:

$ cmake . [options]
$ make
$ make install

Where the possible [options] include:

  • -DLHAPDF=/path/to/lhapdf sets where to find the LHAPDF library, if not in the standard path. The library should be under the lib subdirectory (in this case /path/to/lhapdf/lib) and the headers should be under include (in this case /path/to/lhapdf/include). If you want to set the two directories independently you can use -DLHAPDF_LIB_DIR and -DLHAPDF_INCLUDE_DIR for the library and the headers respectively.
  • -DLOOPTOOLS=/path/to/looptools sets where to find the LoopTools library, if not in the standard path. The library should be in a lib or lib64 subdirectory and the headers should be under include. For LoopTools-2.13 you usually have to use for instance -DLOOPTOOLS=~/.lib/LoopTools-2.13/x86_64-Linux if you have installed the library in a folder ~/.lib.
  • -DCMAKE_PREFIX_PATH=path/to/gsllib sets the path where you have installed gsl, if not in the standard path.
  • -DCMAKE_INSTALL_PREFIX=/path/to/install sets the path where you want to install Resummino.

For further options please consult the CMake documentation.

Running the program

The process information is stored in an input file. An example of such file can be found in input/resummino.in. This input files should reference two model files: The SUSY model information should be stored in a separate SUSY Les Houches Accord (SLHA) file (an example slha.in is provided), and the new gauge bosons model should be stored in an input file with a similar format (an example defining the Sequential Standard Model is stored in input/ssm.in). NOTE: an slha.in file should always be present, even when computing Z'/W' cross sections and SUSY particle masses would not be considered.

To run the code:

$ resummino [options] input_file

The following options are available:

  • --lo stops the calculation after the LO result.
  • --nlo stops the calculation after the NLO result.
  • --nll computes ordinary threshold resummation at NLO+NLL.
  • [no flag] computes ordinary threshold resummation at NLO+NLL; when available collinear improved resummation at NLO+NLL is used.
  • --nnll computes ordinary threshold resummation at the approximate NNLO+NNLL accuracy level for Drell-Yan like processes (available for lepton-pair, slepton-pair and elecroweakino-pair production).
  • --parameter-log=params.log stores the values of all parameters, masses and couplings in a log file params.log for future reference.