MCFM - Monte Carlo for FeMtobarn processes

Authors: John Campbell, Keith Ellis, Ciaran Williams.

Overview

This is the homepage for the parton-level Monte Carlo program MCFM. The program is designed to calculate cross-sections for various femtobarn-level processes at hadron-hadron colliders. For most processes, matrix elements are included at next-to-leading order and incorporate full spin correlations. For more details, including a list of available processes, view the documentation (PDF).

Download

The source is available as a tar'ed and gzip'ed package, which extracts into a directory called MCFM. The source can be initialized by running the Install_omp (or Install, for a non-OMP build) command and then compiled with make, (after, in the non-OMP case, editing the makefile to set USEOMP to NO). The code has been developed and tested under Redhat Linux and Mac OSX, using the compiler gfortran. Please report any compilation problems under other operating systems to the authors. Note that, as of version 6.0, the code requires a Fortran90 compiler. Execution should be carried out in the Bin directory, whilst some documentation (for example, instructions regarding the format for the input file) can be found in Doc.

MCFM-7.0.1.tar.gz ( released October 29th, 2015)

New in version 7.0.1:

Fixed error in real calculation for some versions of gcc 4.x.
Updated output to support ROOT6.

MCFM-7.0.tar.gz (released March 21st, 2015; updated June 11 for gfortran 4.9)

New in version 7.0:

Code compiles with the OpenMP flag to automatically exploit all available threads.
Added four-photon process at NLO.
Inclusion of vector boson fusion/vector boson scattering processes at LO.
After Higgs discovery, added s-channel Higgs diagrams to the gg->VV processes.

MCFM-6.8.tar.gz

New in version 6.8:

Added process for diphoton+jet production at NLO.
Added identical-particle interference effects for 4-lepton production and effect of WW/ZZ interference for 2-lepton, 2-neutrino production.
Added additional decay modes for WW and ZZ processes.
Fixed bug in triphoton process at NLO.

New in version 6.7:

New implementation of gg>ZZ box contribution including massive loops.
Added processes for triphoton production at NLO, 1-loop Higgs pair production.
Fixed errors reported in native histograms and improved PDF uncertainty output.

New in version 6.6 (and 6.5):

Implementation of single top tH and tZ processes.
Implementation of dark matter mono-jet and mono-photon processes.
Inclusion of TensorReduction library for one-loop integrals.

New in version 6.4:

Corrected bug in implementation of one-loop amplitudes for H+2q+2g processes.
Enabled effect of removebr for process 307.
Fixed the implementation of a dynamic scale for single top + b processes.
Added a new scale choice for top production (m(345)²+p_T(345)²).
Improved numerical stability in calculation of virtual contribution to process 201 and in calculation of real corrections to processes 180-187.

New in version 6.3:

Added processes giving the radiation in the hadronic decay of the W⁺W^- process.
Added processes giving the gg to H to WW process with radiation in the hadronic decay of the W.
Added processes giving the production and decay of t tbar W^+/- including radiation in the semi-leptonic decay of the top and the anti-top.
Added processes giving the H to Zγ in the gluon fusion production process.
Added processes describing production of Z+γ+γ and Z+γ+jet at NLO.

New in version 6.2:

Added processes that give results for the t-channel single top process in the four-flavour scheme with top decay;
Added process for Higgs + 2 jets, with Higgs decaying to ɣɣ;
Added processes for Wb production from charm quarks;
Added LO processes for Higgs + 3 jets with Higgs decaying to WW or ZZ;
Added LO process for identical fermions in ZZ decay;
corrected small bugs.

New in version 6.1:

inclusion of massive (t,b) loops in gg → WW diagrams;
new process for computing effect of interference with Higgs diagrams for gg → WW;
inclusion of direct photon production including fragmentation;
anomalous couplings for Wɣ and Zɣ production;
improved interface and output, corrected small bugs.

New in version 6.0:

NLO results for Wbb production including heavy quark mass effects;
inclusion of Wɣ, Zɣ and ɣɣ processes with fragmentation;
gluon-initiated contributions to diboson processes;
small correction to Z+2 jet process and other bug fixes.

A number of packages can be linked to MCFM, if the user desires:

MCFM+ (added Jun 01, 2012) - is an add-on to MCFM to calculate W^+W^-+jet processes, (currently tested only with MCFM version 6.1). This add-on requires a fortran compiler which supports quadruple precision, such as ifort.
CERNLIB - when linked, the parton densities of PDFLIB can be used and n-tuple event output is possible.
LHAPDF - when linked, the pdf implementation of the Les Houches Accord is included.

The default behaviour of the code is to produce histograms in Topdrawer format. Executables for Topdrawer on Linux and Mac OSX, together with documentation for the Topdrawer system, can be found here.

When running with the native PDF routines of MCFM, additional input files may be necessary and can be obtained from the relevant collaboration:

CTEQ
MRS
GRV

Examples

The following plots, of cross sections at past, current and potential future hadron colliders, have been prepared using MCFM. Click on the plots to download a pdf version of them.

There have been a number of papers based on results produced by the MCFM code, each one corresponding to different processes.

Calculation of the Wbb background to a WH signal at the Tevatron.
R.K. Ellis, Sinisa Veseli, Phys. Rev. D60:011501 (1999), hep-ph/9810489.
Vector boson pair production at the Tevatron, including all spin correlations of the boson decay products.
J.M. Campbell, R.K. Ellis, Phys. Rev. D60:113006 (1999), hep-ph/9905386.
Calculation of the Zbb and other backgrounds to a ZH signal at the Tevatron.
J.M. Campbell, R.K. Ellis, Phys. Rev. D62:114012 (2000), hep-ph/0006304.
Next-to-leading order corrections to W+2 jet and Z+2 jet production at hadron colliders.
John Campbell, R.K. Ellis, Phys. Rev. D65:113007 (2002), hep-ph/0202176.
Higgs Boson Production in Association with a Single Bottom Quark.
J. Campbell, R.K. Ellis, F. Maltoni, S. Willenbrock, Phys. Rev. D67:095002 (2003), hep-ph/0204093.
Next-to-Leading Order QCD Predictions for W+2 jet and Z+2 jet Production at the CERN LHC.
J. Campbell, R.K. Ellis and D. Rainwater, Phys. Rev. D68:094021 (2003), hep-ph/0308195.
Associated Production of a Z Boson and a Single Heavy Quark Jet.
J. Campbell, R.K. Ellis, F. Maltoni, S. Willenbrock, Phys. Rev. D69:074021 (2004), hep-ph/0312024.
Single top production and decay at next-to-leading order,
J. Campbell, R.K. Ellis and F. Tramontano, Phys.Rev.D70:094012 (2004), hep-ph/0408158.
Next-to-leading order corrections to Wt production and decay,
J. Campbell, and F. Tramontano, Nucl.Phys.B726:109-130 (2005), hep-ph/0506289.
Production of a Z Boson and Two Jets with One Heavy Quark Tag.
J. Campbell, R.K. Ellis, F. Maltoni, S. Willenbrock, Phys. Rev. D73:054007 (2006), hep-ph/0510362.
Next-to-Leading order Higgs + 2 jet production via gluon fusion.
J. Campbell, R.K. Ellis, G. Zanderighi JHEP 0610:028 (2006), hep-ph/0608194.
t-channel single top production at hadron colliders.
J. M. Campbell, R. Frederix, F. Maltoni and F. Tramontano, Phys. Rev. Lett. 102 (2009) 182003, arXiv:0903.0005 [hep-ph].
Hadronic production of a Higgs boson and two jets at next-to-leading order.
J. M. Campbell, R. K. Ellis and C. Williams, Phys. Rev. D81:074023 (2010), arXiv:1001.4495 [hep-ph].
QCD corrections to the hadronic production of a heavy quark pair and a W-boson including decay correlations.
S. Badger, J. M. Campbell and R. K. Ellis, JHEP 1103, 027 (2011), arXiv:1011.6647 [hep-ph].
Vector boson pair production at the LHC.
J. M. Campbell, R. K. Ellis and C. Williams, JHEP 1107, 018 (2011), arXiv:1105.0020 [hep-ph].
Gluon-gluon contributions to W+ W- production and Higgs interference effects.
J. M. Campbell, R. K. Ellis and C. Williams, JHEP 1110, 005 (2011), arXiv:1107.5569 [hep-ph].
Next-to-leading order predictions for Z gamma+jet and Z gamma gamma final states at the LHC.
John M. Campbell, Heribertus B. Hartanto, Ciaran Williams, arXiv:1208.0566 [hep-ph].

The third of these references contains the most details of our method.

Recent progress

The following recent publications have also made use of calculations implemented in MCFM, but the corresponding code has not yet been made public.

Production of a W boson and two jets with one b-quark tag.
J. Campbell, R.K. Ellis, F. Maltoni, S. Willenbrock, Phys. Rev. D75:054015 (2007), hep-ph/0611348.
QCD corrections to J/psi and Upsilon production at hadron colliders.
J. Campbell, F. Maltoni, F. Tramontano, Phys. Rev. Lett. 98:252002, 2007, hep-ph/0703113.

Older versions

MCFM-6.7.tar.gz (December 6th, 2013)

MCFM-6.6.tar.gz (April 1st, 2013)

MCFM-6.5.tar.gz (March 5th, 2013)

mcfm-6.4.tar.gz (December 22nd, 2012)

mcfm-6.3.tar.gz (August 10th, 2012)

mcfm-6.2.tar.gz (April 10th, 2012)

mcfm-6.1.tar.gz (October 19th, 2011)

mcfm-6.0.tar.gz (May 2nd, 2011)

mcfm-5.8.tar.gz (April 9th, 2010)

mcfm-5.7.tar.gz (January 22nd, 2010)

mcfm-5.6.tar.gz (July 31st, 2009)

mcfm-5.5.tar.gz (June 5th, 2009)

mcfm-5.4.tar.gz (March 12th, 2009)

mcfm-5.3.tar.gz (October 21st, 2008)

mcfm-5.2.tar.gz (July 12th, 2007)

mcfm-5.1.tar.gz (June 1st, 2006)

mcfm-5.0.tar.gz (April 25th, 2006)

mcfm-4.1.tar.gz (January 17th, 2005)

mcfm-4.0.tar.gz (October 15th, 2004)
Major revision of the code, which now includes single top processes.

mcfm-3.4.5.tar.gz (December 23rd, 2003)
Minor update, addition of LO WW production with no polarization info, process 64.

mcfm-3.4.4.tar.gz (September 3rd, 2003)
Minor update, mostly cosmetic changes.

mcfm-3.4.3.tar.gz (July 2nd, 2003)
Bug fixes for input files using the 'tota' option at NLO.

mcfm-3.4.2.tar.gz (June 6th, 2003)
Further minor improvements over version 3.4.1.

mcfm-3.4.1.tar.gz (May 29th, 2003)
Minor improvements over version 3.4.

mcfm-3.4.tar.gz (April 24th, 2003)
Version 3.4 contains a number of new Higgs production processes
at next-to-leading order.

mcfm-3.2.tar.gz (October 1st, 2002)

mcfm-2.1.tar.gz (December 14th, 2001)
An old version, maintained for historical value only.

mcfm-1.0.tar.gz
An old version, maintained for historical value only.

Six gluon amplitudes

In the course of preparing e-Print Archive: hep-ph/0602185, we coded various analytic one-loop results for the six gluon amplitudes. The fortran programs are given here.

Higgs + 4 parton amplitudes

In the course of preparing e-Print Archive: arXiv: 0910.4481 [hep-ph], we coded the analytic one-loop results for the Higgs + 4 parton amplitudes. The fortran programs are given here(updated 12/19/2012).

Alternatives

For other NLO codes of a similar nature see:

DYRAD
JETRAD
NLOJET++
AYLEN/EMILIA
EKS, (S.D.) Ellis, Kunszt and Soper jet codes
Mangano, Nason and Ridolfi have released MNR code for heavy quark production
Frixione and Ridolfi have released the code for jet (photo)-production
Codes (mainly) for Higgs-production from Michael Spira
The PHOX family from P. Aurenche, T. Binoth, M. Fontannaz, J. Ph. Guillet, G. Heinrich, E. Pilon and M. Werlen.

For tree graph codes for many processes see:

MADGRAPH
ALPGEN

Last updated: 26th April 2014.
E-mail: johnmc@fnal.gov.

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