NLO QCD corrections in Herwig++ with MC@NLO

  • Stefano FrixioneEmail author
  • Fabian Stoeckli
  • Paolo Torrielli
  • Bryan R. Webber
Open Access


We present the calculations necessary to obtain next-to-leading order QCD precision with the Herwig++ event generator using the MC@NLO approach, and implement them for all the processes that were previously available from Fortran HERWIG with MC@NLO. We show a range of results comparing the two implementations. With these calculations and recent developments in the automatic generation of NLO matrix elements, it will be possible to obtain NLO precision with Herwig++ for a much wider range of processes.


QCD Phenomenology 


  1. [1]
    S. Frixione and B.R. Webber, Matching NLO QCD computations and parton shower simulations, JHEP 06 (2002) 029 [hep-ph/0204244] [SPIRES].CrossRefADSGoogle Scholar
  2. [2]
    G. Marchesini et al., HERWIG: a Monte Carlo event generator for simulating hadron emission reactions with interfering gluons. Version 5.1 — April 1991, Comput. Phys. Commun. 67 (1992) 465 [SPIRES].CrossRefADSGoogle Scholar
  3. [3]
    G. Corcella et al., HERWIG 6.5: an event generator for Hadron Emission Reactions With Interfering Gluons (including supersymmetric processes), JHEP 01 (2001) 010 [hep-ph/0011363] [SPIRES].CrossRefADSGoogle Scholar
  4. [4]
    G. Corcella et al., HERWIG 6.5 release note, hep-ph/0210213 [SPIRES].
  5. [5]
    P. Torrielli and S. Frixione, Matching NLO QCD computations with PYTHIA using MC@NLO, JHEP 04 (2010) 110 [arXiv:1002.4293] [SPIRES].CrossRefADSGoogle Scholar
  6. [6]
    M. Bahr et al., HERWIG++ physics and manual, Eur. Phys. J. C 58 (2008) 639 [arXiv:0803.0883] [SPIRES].CrossRefADSGoogle Scholar
  7. [7]
    M. Bahr et al., HERW IG++ 2.3 release note, arXiv:0812.0529 [SPIRES].
  8. [8]
    O. Latunde-Dada, HERWIG Monte Carlo at Next-to-Leading Order for e + e annihilation and lepton pair production, JHEP 11 (2007) 040 [arXiv:0708.4390] [SPIRES].CrossRefADSGoogle Scholar
  9. [9]
    A. Papaefstathiou and O. Latunde-Dada, NLO production of W′ bosons at hadron colliders using the MC@NLO and POWHEG methods, JHEP 07 (2009) 044 [arXiv:0901.3685] [SPIRES].CrossRefADSGoogle Scholar
  10. [10]
    O. Latunde-Dada, MC@NLO for the hadronic decay of Higgs bosons in associated production with vector bosons, JHEP 05 (2009) 112 [arXiv:0903.4135] [SPIRES].CrossRefADSGoogle Scholar
  11. [11]
    S. Frixione, P. Nason and B.R. Webber, Matching NLO QCD and parton showers in heavy flavour production, JHEP 08 (2003) 007 [hep-ph/0305252] [SPIRES].CrossRefADSGoogle Scholar
  12. [12]
    S. Frixione, Z. Kunszt and A. Signer, Three jet cross-sections to next-to-leading order, Nucl. Phys. B 467 (1996) 399 [hep-ph/9512328] [SPIRES].CrossRefADSGoogle Scholar
  13. [13]
    R. Frederix, S. Frixione, F. Maltoni and T. Stelzer, Automation of next-to-leading order computations in QCD: the FKS subtraction, JHEP 10 (2009) 003 [arXiv:0908.4272] [SPIRES].CrossRefADSGoogle Scholar
  14. [14]
    S. Frixione, E. Laenen, P. Motylinski and B.R. Webber, Single-top production in MC@NLO, JHEP 03 (2006) 092 [hep-ph/0512250] [SPIRES].CrossRefADSGoogle Scholar
  15. [15]
    S. Frixione, E. Laenen, P. Motylinski and B.R. Webber, Angular correlations of lepton pairs from vector boson and top quark decays in Monte Carlo simulations, JHEP 04 (2007) 081 [hep-ph/0702198] [SPIRES].CrossRefADSGoogle Scholar
  16. [16]
    P.M. Nadolsky et al., Implications of CTEQ global analysis for collider observables, Phys. Rev. D 78 (2008) 013004 [arXiv:0802.0007] [SPIRES].ADSGoogle Scholar
  17. [17]
    C. Anastasiou, G. Dissertori, F. Stockli and B.R. Webber, QCD radiation effects on the HWWlνlν signal at the LHC, JHEP 03 (2008) 017 [arXiv:0801.2682] [SPIRES].CrossRefADSGoogle Scholar
  18. [18]
    C. Anastasiou, G. Dissertori, M. Grazzini, F. Stockli and B.R. Webber, Perturbative QCD effects and the search for a HWWlνlν signal at the Tevatron, JHEP 08 (2009) 099 [arXiv:0905.3529] [SPIRES].CrossRefADSGoogle Scholar
  19. [19]
    S. Gieseke, P. Stephens and B. Webber, New formalism for QCD parton showers, JHEP 12 (2003) 045 [hep-ph/0310083] [SPIRES].CrossRefADSGoogle Scholar
  20. [20]
    S. Catani, S. Dittmaier and Z. Trócsányi, One-loop singular behaviour of QCD and SUSY QCD amplitudes with massive partons, Phys. Lett. B 500 (2001) 149 [hep-ph/0011222] [SPIRES].ADSGoogle Scholar
  21. [21]
    K. Hamilton and P. Richardson, A simulation of QCD radiation in top quark decays, JHEP 02 (2007) 069 [hep-ph/0612236] [SPIRES].CrossRefADSGoogle Scholar
  22. [22]
    M. Cacciari and G.P. Salam, Dispelling the N 3 myth for the k t jet-finder, Phys. Lett. B 641 (2006) 57 [hep-ph/0512210] [SPIRES].ADSGoogle Scholar
  23. [23]
    M. Cacciari, G.P. Salam and G. Soyez, FastJet,
  24. [24]
    S. Frixione, E. Laenen, P. Motylinski, B.R. Webber and C.D. White, Single-top hadroproduction in association with a W boson, JHEP 07 (2008) 029 [arXiv:0805.3067] [SPIRES].CrossRefADSGoogle Scholar
  25. [25]
    K. Odagiri, Color connection structure of supersymmetric QCD (2 → 2) processes, JHEP 10 (1998) 006 [hep-ph/9806531] [SPIRES].CrossRefADSGoogle Scholar

Copyright information

© The Author(s) 2011

Open Access This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.

Authors and Affiliations

  • Stefano Frixione
    • 1
    • 2
    Email author
  • Fabian Stoeckli
    • 1
  • Paolo Torrielli
    • 2
  • Bryan R. Webber
    • 3
  1. 1.PH Department, TH UnitCERNGeneva 23Switzerland
  2. 2.ITPP, EPFLLausanneSwitzerland
  3. 3.Cavendish LaboratoryCambridgeU.K.

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