User menu

Accès à distance ? S'identifier sur le proxy UCLouvain

Automation of next-to-leading order computations in QCD: the FKS subtraction

Primary tabs

download
  • Open access
  • PDF
  • 758.64 K
Frederix, Rikkert [PH Department, TH Unit, CERN, CH-1211 Geneva 23, Switzerland] Frixione, Stefano [PH Department, TH Unit, CERN, CH-1211 Geneva 23, Switzerland; ITPP, EPFL, CH-1015 Lausanne, Switzerland] Maltoni, Fabio [UCL] Stelzer, Tim [Department of Physics, University of Illinois at Urbana-Champaign, 1110 West Green Street, Urbana, IL 61801, U.S.A.]

We present the complete automation of the universal subtraction formalism proposed by Frixione, Kunszt, and Signer for the computation of any cross section at the next-to-leading order in QCD. Given a process, the only ingredient to be provided externally is the infrared- and ultraviolet-finite contribution of virtual origin. Our implementation, currently restricted to the case of e+e− collisions, is built upon and works in the same way as MadGraph. It is particularly suited to parallel computation, and it can deal with any physical process resulting from a theory implemented in MadGraph, thus including the Standard Model as well as Beyond the Standard Model theories. We give results for some sample processes that document the performances of the implementation, and show in particular how the number of subtraction terms has an extremely mild growth with final-state multiplicity.

Document type Article de périodique (Journal article) – Article de recherche
Access type Accès libre
Publication date 2009
Language Anglais
Journal information "Journal of High Energy Physics" - Vol. 10, p. 003 (2009)
Peer reviewed yes
Publisher Institute of Physics
issn 1029-8479
e-issn 1029-8479
Publication status Publié
Affiliations PH Department, TH Unit, CERN, CH-1211 Geneva 23, Switzerland
PH Department, TH Unit, CERN, CH-1211 Geneva 23, Switzerland; ITPP, EPFL, CH-1015 Lausanne, Switzerland
UCL - SST/IRMP - Institut de recherche en mathématique et physique
Department of Physics, University of Illinois at Urbana-Champaign, 1110 West Green Street, Urbana, IL 61801, U.S.A.
Keywords Beyond Standard Model ; Heavy Quarks Physics ; QCD ; NLO Computations
Links
  1. M.A. Dobbs .
  2. S. Catani, J. High Energy Phys., 2001, 063 (2001)
  3. F. Krauss, J. High Energy Phys., 2002, 015 (2002)
  4. L. Lönnblad, J. High Energy Phys., 2002, 046 (2002)
  5. Alwall J., Höche S., Krauss F., Lavesson N., Lönnblad L., Maltoni F., Mangano M.L., Moretti M., Papadopoulos C.G., Piccinini F., Schumann S., Treccani M., Winter J., Worek M., Comparative study of various algorithms for the merging of parton showers and matrix elements in hadronic collisions, 10.1140/epjc/s10052-007-0490-5
  6. C.F. Berger .
  7. A. van Hameren
  8. R.K. Ellis, J. High Energy Phys., 2009, 077 (2009)
  9. Binoth T., Guillet J.-Ph., Heinrich G., Pilon E., Reiter T., golem95: A numerical program to calculate one-loop tensor integrals with up to six external legs, 10.1016/j.cpc.2009.06.024
  10. Stelzer T., Long W.F., Automatic generation of tree level helicity amplitudes, 10.1016/0010-4655(94)90084-1
  11. J. Alwall ., J. High Energy Phys., 2007, 028 (2007)
  12. Frixione S., Kunszt Z., Signer A., Three-jet cross sections to next-to-leading order, 10.1016/0550-3213(96)00110-1
  13. Frixione Stefano, A general approach to jet cross sections in QCD, 10.1016/s0550-3213(97)00574-9
  14. S. Frixione, J. High Energy Phys., 2002, 029 (2002)
  15. P. Nason, J. High Energy Phys., 2004, 040 (2004)
  16. S. Frixione, J. High Energy Phys., 2007, 070 (2007)
  17. Bredenstein A., Denner A., Dittmaier S., Pozzorini S., Next-To-Leading Order QCD Corrections topp→tt¯bb¯+Xat the LHC, 10.1103/physrevlett.103.012002
  18. Ossola Giovanni, Papadopoulos Costas G., Pittau Roberto, Reducing full one-loop amplitudes to scalar integrals at the integrand level, 10.1016/j.nuclphysb.2006.11.012
  19. Bern Zvi, Dixon Lance J., Kosower David A., On-shell methods in perturbative QCD, 10.1016/j.aop.2007.04.014
  20. W.T. Giele, J. High Energy Phys., 2008, 049 (2008)
  21. Berger C. F., Bern Z., Dixon L. J., Cordero F. Febres, Forde D., Ita H., Kosower D. A., Maître D., Automated implementation of on-shell methods for one-loop amplitudes, 10.1103/physrevd.78.036003
  22. Catani S., Seymour M.H., A general algorithm for calculating jet cross sections in NLO QCD, 10.1016/s0550-3213(96)00589-5
  23. Giele W. T., Glover E. W. N., Higher-order corrections to jet cross sections ine+e−annihilation, 10.1103/physrevd.46.1980
  24. Giele W.T., Glover E.W.N., Kosower David A., Higher-order corrections to jet cross sections in hadron colliders, 10.1016/0550-3213(93)90365-v
  25. M.H. Seymour
  26. R. Frederix, J. High Energy Phys., 2008, 122 (2008)
  27. Hasegawa K., Moch S., Uwer P., Automating dipole subtraction, 10.1016/j.nuclphysbps.2008.09.115
  28. Gleisberg T., Krauss F., Automating dipole subtraction for QCD NLO calculations, 10.1140/epjc/s10052-007-0495-0
  29. M. Czakon, J. High Energy Phys., 2009, 085 (2009)
  30. S. Frixione, J. High Energy Phys., 2005, 010 (2005)
  31. S. Frixione, J. High Energy Phys., 2006, 092 (2006)
  32. Ellis R.K., Sexton J.C., QCD radiative corrections to parton-parton scattering, 10.1016/0550-3213(86)90232-4
  33. F. Maltoni, J. High Energy Phys., 2003, 027 (2003)
  34. de Florian Daniel, Frixione Stefano, Signer Adrian, Vogelsang Werner, Next-to-leading order jet cross sections in polarized hadronic collisions, 10.1016/s0550-3213(98)00673-7
  35. Catani S., Dokshitzer Yu.L., Seymour M.H., Webber B.R., Longitudinally-invariant k⊥-clustering algorithms for hadron-hadron collisions, 10.1016/0550-3213(93)90166-m
  36. Peter Lepage G, A new algorithm for adaptive multidimensional integration, 10.1016/0021-9991(78)90004-9
  37. Catani Stefano, Dittmaier Stefan, Trócsányi Zoltán, One-loop singular behaviour of QCD and SUSY QCD amplitudes with massive partons, 10.1016/s0370-2693(01)00065-x
  38. Kunszt Zoltan, Signer Adrian, Trócsányi Zoltán, One-loop helicity amplitudes for all 2 → 2 processes in QCD and N = 1 supersymmetric Yang-Mills theory, 10.1016/0550-3213(94)90456-1
  39. Mangano Michelangelo L., Parke Stephen J., Multi-parton amplitudes in gauge theories, 10.1016/0370-1573(91)90091-y
  40. H. Murayama
  41. Altarelli G., Parisi G., Asymptotic freedom in parton language, 10.1016/0550-3213(77)90384-4
  42. Vogelsang Werner, Rederivation of the spin-dependent next-to-leading order splitting functions, 10.1103/physrevd.54.2023
Bibliographic reference Frederix, Rikkert ; Frixione, Stefano ; Maltoni, Fabio ; Stelzer, Tim. Automation of next-to-leading order computations in QCD: the FKS subtraction. In: Journal of High Energy Physics, Vol. 10, p. 003 (2009)
Permanent URL http://hdl.handle.net/2078.1/72245