Journal of High Energy Physics

, 2012:99 | Cite as

Four-lepton production at hadron colliders: aMC@NLO predictions with theoretical uncertainties

  • Rikkert Frederix
  • Stefano Frixione
  • Valentin Hirschi
  • Fabio Maltoni
  • Roberto Pittau
  • Paolo Torrielli
Open Access


We use aMC@NLO to study the production of four charged leptons at the LHC, performing parton showers with both HERWIG and Pythia6. Our underlying matrix element calculation features the full next-to-leading order \( \mathcal{O}\left( {{\alpha_s}} \right) \) result and the \( \mathcal{O}\left( {\alpha_s^2} \right) \) contribution of the gg channel, and it includes all off-shell, spin-correlation, virtual-photon-exchange, and interference effects. We present several key distributions together with the corresponding theoretical uncertainties. These are obtained through a process-independent technique that allows aMC@NLO to compute scale and PDF uncertainties in a fully automated way and at no extra CPU-time cost.


NLO Computations Hadronic Colliders QCD Standard Model 


  1. [1]
    S. Frixione and B.R. Webber, Matching NLO QCD computations and parton shower simulations, JHEP 06 (2002) 029 [hep-ph/0204244] [INSPIRE].ADSCrossRefGoogle Scholar
  2. [2]
    R. Frederix, S. Frixione, V. Hirschi, F. Maltoni, R. Pittau, et al., Scalar and pseudoscalar Higgs production in association with a top-antitop pair, Phys. Lett. B 701 (2011) 427 [arXiv:1104.5613] [INSPIRE].ADSGoogle Scholar
  3. [3]
    R. Frederix, S. Frixione, V. Hirschi, F. Maltoni, R. Pittau, et al., W and Z/γ* boson production in association with a bottom-antibottom pair, JHEP 09 (2011) 061 [arXiv:1106.6019] [INSPIRE].ADSCrossRefGoogle Scholar
  4. [4]
    S. Frixione, F. Stoeckli, P. Torrielli, B.R. Webber and C.D. White, The MCaNLO 4.0 Event Generator, arXiv:1010.0819 [INSPIRE].
  5. [5]
    J. Ohnemus and J. Owens, An Order α s calculation of hadronic ZZ production, Phys. Rev. D 43 (1991) 3626 [INSPIRE].ADSGoogle Scholar
  6. [6]
    B. Mele, P. Nason and G. Ridolfi, QCD radiative corrections to Z boson pair production in hadronic collisions, Nucl. Phys. B 357 (1991) 409 [INSPIRE].ADSCrossRefGoogle Scholar
  7. [7]
    L.J. Dixon, Z. Kunszt and A. Signer, Helicity amplitudes for O(α s ) production of W + W , W ± Z, ZZ, W ± γ, or Zγ pairs at hadron colliders, Nucl. Phys. B 531 (1998) 3 [hep-ph/9803250] [INSPIRE].ADSCrossRefGoogle Scholar
  8. [8]
    J.M. Campbell and R. Ellis, An Update on vector boson pair production at hadron colliders, Phys. Rev. D 60 (1999) 113006 [hep-ph/9905386] [INSPIRE].ADSGoogle Scholar
  9. [9]
    L.J. Dixon, Z. Kunszt and A. Signer, Vector boson pair production in hadronic collisions at order α s : Lepton correlations and anomalous couplings, Phys. Rev. D 60 (1999) 114037 [hep-ph/9907305] [INSPIRE].ADSGoogle Scholar
  10. [10]
    R. Frederix and M. Grazzini, Higher-order QCD effects in the hZZ search channel at the LHC, Phys. Lett. B 662 (2008) 353 [arXiv:0801.2229] [INSPIRE].ADSGoogle Scholar
  11. [11]
    T. Melia, P. Nason, R. Rontsch and G. Zanderighi, W + W , WZ and ZZ production in the POWHEG BOX, JHEP 11 (2011) 078 [arXiv:1107.5051] [INSPIRE].ADSCrossRefGoogle Scholar
  12. [12]
    D.A. Dicus, C. Kao and W. Repko, Gluon production of gauge bosons, Phys. Rev. D 36 (1987) 1570 [INSPIRE].ADSGoogle Scholar
  13. [13]
    E. Glover and J. van der Bij, Vector boson pair production via gluon fusion, Phys. Lett. B 219 (1989) 488 [INSPIRE].ADSGoogle Scholar
  14. [14]
    E. Glover and J. van der Bij, Z boson pair production via gluon fusion, Nucl. Phys. B 321 (1989) 561 [INSPIRE].ADSCrossRefGoogle Scholar
  15. [15]
    T. Binoth, N. Kauer and P. Mertsch, Gluon-induced QCD corrections to ppZZ\( l\overline l l\prime \overline l \prime \), arXiv:0807.0024 [INSPIRE].
  16. [16]
    J.M. Campbell, R. Ellis and C. Williams, Vector boson pair production at the LHC, JHEP 07 (2011) 018 [arXiv:1105.0020] [INSPIRE].ADSCrossRefGoogle Scholar
  17. [17]
    T. Sjöstrand, S. Mrenna and P.Z. Skands, PYTHIA 6.4 Physics and Manual, JHEP 05 (2006) 026 [hep-ph/0603175] [INSPIRE].ADSCrossRefGoogle Scholar
  18. [18]
    V. Hirschi, R. Frederix, S. Frixione, M.V. Garzelli, F. Maltoni, et al., Automation of one-loop QCD corrections, JHEP 05 (2011) 044 [arXiv:1103.0621] [INSPIRE].ADSCrossRefGoogle Scholar
  19. [19]
    P. Torrielli and S. Frixione, Matching NLO QCD computations with PYTHIA using MC@NLO, JHEP 04 (2010) 110 [arXiv:1002.4293] [INSPIRE].ADSCrossRefGoogle Scholar
  20. [20]
    J. Alwall, P. Demin, S. de Visscher, R. Frederix, M. Herquet, et al., MadGraph/MadEvent v4: The New Web Generation, JHEP 09 (2007) 028 [arXiv:0706.2334] [INSPIRE].ADSCrossRefGoogle Scholar
  21. [21]
    G. Ossola, C.G. Papadopoulos and R. Pittau, Reducing full one-loop amplitudes to scalar integrals at the integrand level, Nucl. Phys. B 763 (2007) 147 [hep-ph/0609007] [INSPIRE].MathSciNetADSCrossRefGoogle Scholar
  22. [22]
    G. Ossola, C.G. Papadopoulos and R. Pittau, CutTools: A Program implementing the OPP reduction method to compute one-loop amplitudes, JHEP 03 (2008) 042 [arXiv:0711.3596] [INSPIRE].ADSCrossRefGoogle Scholar
  23. [23]
    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] [INSPIRE].ADSCrossRefGoogle Scholar
  24. [24]
    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] [INSPIRE].ADSCrossRefGoogle Scholar
  25. [25]
    J. Alwall, Q. Li and F. Maltoni, Matched predictions for Higgs production via heavy-quark loops in the SM and beyond, Phys. Rev. D 85 (2012) 014031 [arXiv:1110.1728] [INSPIRE].ADSGoogle Scholar
  26. [26]
    G. Corcella, I. Knowles, G. Marchesini, S. Moretti, K. Odagiri, et al., HERWIG 6: An Event generator for hadron emission reactions with interfering gluons (including supersymmetric processes), JHEP 01 (2001) 010 [hep-ph/0011363] [INSPIRE].ADSCrossRefGoogle Scholar
  27. [27]
    A. Martin, W. Stirling, R. Thorne and G. Watt, Parton distributions for the LHC, Eur. Phys. J. C 63 (2009) 189 [arXiv:0901.0002] [INSPIRE].ADSCrossRefGoogle Scholar
  28. [28]
    T. Binoth, M. Ciccolini, N. Kauer and M. Krämer, Gluon-induced W-boson pair production at the LHC, JHEP 12 (2006) 046 [hep-ph/0611170] [INSPIRE].ADSCrossRefGoogle Scholar
  29. [29]
    J.M. Campbell, R. Ellis and C. Williams, Gluon-Gluon Contributions to W + W Production and Higgs Interference Effects, JHEP 10 (2011) 005 [arXiv:1107.5569] [INSPIRE].ADSCrossRefGoogle Scholar
  30. [30]
    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] [INSPIRE].ADSCrossRefGoogle Scholar
  31. [31]
    LHC Higgs Cross Section Working Group collaboration, S. Dittmaier et al., Handbook of LHC Higgs Cross Sections: 1. Inclusive Observables, arXiv:1101.0593 [INSPIRE].

Copyright information

© SISSA, Trieste, Italy 2012

Authors and Affiliations

  • Rikkert Frederix
    • 1
  • Stefano Frixione
    • 2
    • 3
  • Valentin Hirschi
    • 3
  • Fabio Maltoni
    • 4
  • Roberto Pittau
    • 5
  • Paolo Torrielli
    • 3
  1. 1.Institut für Theoretische PhysikUniversität ZürichZürichSwitzerland
  2. 2.PH Department, TH UnitCERNGeneva 23Switzerland
  3. 3.ITPP, EPFLLausanneSwitzerland
  4. 4.Centre for Cosmology, Particle Physics and Phenomenology (CP3)Université catholique de LouvainLouvain-la-NeuveBelgium
  5. 5.Departamento de Física Teórica y del Cosmos y CAFPEUniversidad de GranadaGranadaSpain

Personalised recommendations