The MC@NLO Package
MC@NLO is a Fortran package to implement the eponymous scheme for combining a Monte Carlo event generator with Next-to-Leading-Order calculations of rates for QCD processes.
MC@NLO makes use of the Fortran HERWIG or C++ Herwig++ event generator.
The current (sub)version is MC@NLO 4.09, released on 2 July 2012, which is identical to version 4.08 (released on 29 June 2012) when used with Fortran HERWIG. Version 4.08 includes all features of subversion 4.07, and allows SM Higgs production in gluon fusion to be simulated with the exact top and bottom quark mass dependences in all matrix elements. In addition, the accuracy of the integration step in Drell-Yan production has been increased: please see the manual for details. When used with Herwig++, version 4.09 also removes the colour flow labels from leptons in the Les Houches event file that is passed to the event generator. These labels are used for lepton number flow in Fortran HERWIG but can cause problems in Herwig++.
The processes available in this version are those of Higgs boson, single vector boson, vector boson pair, heavy quark pair, single top (with and without associated W or charged Higgs), lepton pair and associated Higgs+W/Z production in hadron collisions.
This version is compatible with Fortran HERWIG 6.5 or higher, which can be obtained from the HERWIG home page. Use of version 6.520 or higher is strongly recommended. See also the HERWIG wiki for latest news and updates.
This version is also compatible with Herwig++, which can be obtained from the Herwig++ home page. The user will have to provide installed versions of Herwig++ and ThePEG. We advise the user to adopt version 2.4.2 or higher for Herwig++ and 1.6.1 or higher for ThePEG. We stress that the options ReconstructionOption=General and InitialInitialBoostOption=LongTransBoost must be used when running Herwig++. These are automatically set by our script, and the user must not change them.
Here you can find
- The MC@NLO 4.09 package (gzipped tar file);
- The MC@NLO 4.08 manual (gzipped postscript, pdf);
- The article JHEP06(2002)029 describing the MC@NLO formalism (local copy);
- The article JHEP08(2003)007 describing the application to heavy quark pair production (local copy);
- The article JHEP03(2006)092 describing the application to single top production (local copy);
- The article JHEP07(2008)029 describing the application to tW production (local copy);
- The article JHEP01(2011)053 describing the implementation for Herwig++ (local copy);
- A description (gzipped Postscript) and the grid files (gzipped tar file) of our parton density function library, which is a faster version of PFDLIB with many newer PDFs.
- A local copy of the original PDFLIB manual (gzipped Postscript), which you may need to refer to.
If you use MC@NLO, please cite the original publication:
- S. Frixione and B.R. Webber, Matching NLO QCD computations and parton shower simulations, JHEP 0206 (2002) 029 [hep-ph/0204244]
and those relevant from the following:
- S. Frixione, P. Nason and B.R. Webber, Matching NLO QCD and parton showers in heavy flavour production, JHEP 0308 (2003) 007 [hep-ph/0305252];
- S. Frixione, E. Laenen, P. Motylinski and B.R. Webber, Single-top production in MC@NLO, JHEP 0603 (2006) 092 [hep-ph/0512250];
- S. Frixione, E. Laenen, P. Motylinski, B.R. Webber and C.D. White, Single-top production in association with a W boson, JHEP 0807 (2008) 029 [arXiv:0805.3067].
- S. Frixione, F. Stoeckli P. Torrielli and B.R. Webber, NLO QCD corrections in Herwig++ with MC@NLO, JHEP 1101 (2011) 053 [arXiv:1010.0568].
The program by B. Fuks, M. Klasen, F. Ledroit, Q. Li and J. Morel implementing Z' production in MC@NLO can be found here.
Last updated BRW 29/06/12