Computer Physics Communications Program LibraryPrograms in Physics & Physical Chemistry |

[Licence| Download | New Version Template] aeoc_v1_0.tar.gz(2942 Kbytes) | ||
---|---|---|

Manuscript Title: HELAC-NLO | ||

Authors: G. Bevilacqua, M. Czakon, M.V. Garzelli, A. van Hameren, A. Kardos, C.G. Papadopoulos, R. Pittau, M. Worek | ||

Program title: HELAC-1LOOP | ||

Catalogue identifier: AEOC_v1_0Distribution format: tar.gz | ||

Journal reference: Comput. Phys. Commun. 184(2013)986 | ||

Programming language: Fortran (gfortran(http://gcc.gnu.org/fortran/), lahey95 (http://www.lahey.com), ifort3(http://software.intel.com)). | ||

Computer: Any. | ||

Operating system: Linux, Unix, Mac OS. | ||

Keywords: QCD, NLO corrections, Scattering Amplitudes. | ||

Classification: 11.1. | ||

Nature of problem:The evaluation of virtual one-loop amplitudes for multi-particle scattering is a longstanding problem [1]. In the last years the OPP reduction technique [2] opened the road for a fully numerical approach based on the evaluation of the one-loop amplitude for well-defined values of the loop momentum. | ||

Solution method:By using HELAC [3-5] and CutTools [6], HELAC-1LOOP is capable of evaluating QCD virtual corrections [7]. The one-loop n-particle amplitudes are
constructed as part of the n + 2 tree-order ones, by using the basic
recursive algorithm used in HELAC. A Les Houches Event (LHE) file is being
produced combining the complete information from tree- and virtual one-loop
contributions. In conjunction with real corrections, obtained with the use of
HELAC-DIPOLES [8], the full NLO corrections can be computed. The program has
been successfully used in many applications. | ||

Running time:Depending on the number of particles and generated events from seconds to days. | ||

References: | ||

[1] | R.K. Ellis, Z. Kunszt, K. Melnikov and G. Zanderighi, arXiv:1105.4319 [hepph]. | |

[2] | G. Ossola, C. G. Papadopoulos and R. Pittau, Nucl. Phys. B 763 (2007) 147 [arXiv:hep-ph/0609007]. | |

[3] | A. Kanaki and C. G. Papadopoulos, Comput. Phys. Commun. 132 (2000) 306 [arXiv:hep-ph/0002082]. | |

[4] | C. G. Papadopoulos, Comput. Phys. Commun. 137 (2001) 247 [arXiv:hepph/ 0007335]. | |

[5] | A. Cafarella, C. G. Papadopoulos and M. Worek, Comput. Phys. Commun. 180 (2009) 1941 [arXiv:0710.2427 [hep-ph]]. | |

[6] | G. Ossola, C. G. Papadopoulos and R. Pittau, JHEP 0803 (2008) 042 [arXiv:0711.3596 [hep-ph]]. | |

[7] | A. van Hameren, C. G. Papadopoulos and R. Pittau, JHEP 0909, 106 (2009) [arXiv:0903.4665 [hep-ph]]. | |

[8] | M. Czakon, C. G. Papadopoulos and M. Worek, JHEP 0908, 085 (2009) [arXiv:0905.0883 [hep-ph]]. |

Disclaimer | ScienceDirect | CPC Journal | CPC | QUB |