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Automatic spin-entangled decays of heavy resonances in Monte Carlo simulations

  • Pierre ArtoisenetEmail author
  • Rikkert Frederix
  • Olivier Mattelaer
  • Robbert Rietkerk
Open Access
Article

Abstract

We present a general method that allows one to decay narrow resonances in Les Houches Monte Carlo events in an efficient and accurate way. The procedure preserves both spin correlation and finite width effects to a very good accuracy, and is therefore particularly suited for the decay of resonances in production events generated at next-to-leading-order accuracy. The method is implemented as a generic tool in the Mad-Graph5 framework, giving access to a very large set of possible applications. We illustrate the validity of the method and the code by applying it to the case of single top and top quark pair production, and show its capabilities on the case of top quark pair production in association with a Higgs boson.

Keywords

Monte Carlo Simulations Hadronic Colliders 

References

  1. [1]
    J.M. Campbell, R.K. Ellis and F. Tramontano, Single top production and decay at next-to-leading order, Phys. Rev. D 70 (2004) 094012 [hep-ph/0408158] [INSPIRE].ADSGoogle Scholar
  2. [2]
    J.M. Campbell and F. Tramontano, Next-to-leading order corrections to Wt production and decay, Nucl. Phys. B 726 (2005) 109 [hep-ph/0506289] [INSPIRE].ADSCrossRefGoogle Scholar
  3. [3]
    S. Badger, J.M. Campbell and R. Ellis, QCD corrections to the hadronic production of a heavy quark pair and a W-boson including decay correlations, JHEP 03 (2011) 027 [arXiv:1011.6647] [INSPIRE].ADSCrossRefGoogle Scholar
  4. [4]
    P. Richardson, Spin correlations in Monte Carlo simulations, JHEP 11 (2001) 029 [hep-ph/0110108] [INSPIRE].ADSCrossRefGoogle Scholar
  5. [5]
    P. Meade and M. Reece, BRIDGE: branching ratio inquiry/decay generated events, hep-ph/0703031 [INSPIRE].
  6. [6]
    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] [INSPIRE].ADSCrossRefGoogle Scholar
  7. [7]
    S. Frixione and B.R. Webber, Matching NLO QCD computations and parton shower simulations, JHEP 06 (2002) 029 [hep-ph/0204244] [INSPIRE].ADSCrossRefGoogle Scholar
  8. [8]
    S. Frixione, E. Laenen, P. Motylinski and B.R. Webber, Single-top production in MC@NLO, JHEP 03 (2006) 092 [hep-ph/0512250] [INSPIRE].ADSCrossRefGoogle Scholar
  9. [9]
    S. Frixione, P. Nason and G. Ridolfi, A positive-weight next-to-leading-order Monte Carlo for heavy flavour hadroproduction, JHEP 09 (2007) 126 [arXiv:0707.3088] [INSPIRE].ADSCrossRefGoogle Scholar
  10. [10]
    S. Alioli, P. Nason, C. Oleari and E. Re, A general framework for implementing NLO calculations in shower Monte Carlo programs: the POWHEG BOX, JHEP 06 (2010) 043 [arXiv:1002.2581] [INSPIRE].ADSCrossRefGoogle Scholar
  11. [11]
    R. Frederix 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
  12. [12]
    S. Hoeche, F. Krauss, M. Schonherr and F. Siegert, A critical appraisal of NLO+PS matching methods, JHEP 09 (2012) 049 [arXiv:1111.1220] [INSPIRE].ADSCrossRefGoogle Scholar
  13. [13]
    M. Garzelli, A. Kardos, C. Papadopoulos and Z. Trócsányi, Standard model Higgs boson production in association with a top anti-top pair at NLO with parton showering, Europhys. Lett. 96 (2011) 11001 [arXiv:1108.0387] [INSPIRE].ADSCrossRefGoogle Scholar
  14. [14]
    T. Sjöstrand, S. Mrenna and P.Z. Skands, PYTHIA 6.4 physics and manual, JHEP 05 (2006) 026 [hep-ph/0603175] [INSPIRE].ADSCrossRefGoogle Scholar
  15. [15]
    T. Sjöstrand, S. Mrenna and P.Z. Skands, A brief introduction to PYTHIA 8.1, Comput. Phys. Commun. 178 (2008) 852 [arXiv:0710.3820] [INSPIRE].ADSzbMATHCrossRefGoogle Scholar
  16. [16]
    G. Corcella 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
  17. [17]
    J. Alwall, M. Herquet, F. Maltoni, O. Mattelaer and T. Stelzer, MadGraph 5: going beyond, JHEP 06 (2011) 128 [arXiv:1106.0522] [INSPIRE].ADSCrossRefGoogle Scholar
  18. [18]
    C. Degrande et al., UFOThe Universal FeynRules Output, Comput. Phys. Commun. 183 (2012) 1201 [arXiv:1108.2040] [INSPIRE].ADSCrossRefGoogle Scholar
  19. [19]
    P. de Aquino, W. Link, F. Maltoni, O. Mattelaer and T. Stelzer, ALOHA: Automatic Libraries Of Helicity Amplitudes for Feynman diagram computations, Comput. Phys. Commun. 183 (2012) 2254 [arXiv:1108.2041] [INSPIRE].ADSCrossRefGoogle Scholar
  20. [20]
    F. Maltoni and T. Stelzer, MadEvent: automatic event generation with MadGraph, JHEP 02 (2003) 027 [hep-ph/0208156] [INSPIRE].ADSCrossRefGoogle Scholar
  21. [21]
    J.M. Campbell, R. Frederix, F. Maltoni and F. Tramontano, Next-to-leading-order predictions for t-channel single-top production at hadron colliders, Phys. Rev. Lett. 102 (2009) 182003 [arXiv:0903.0005] [INSPIRE].ADSCrossRefGoogle Scholar
  22. [22]
    M. Cacciari, G.P. Salam and G. Soyez, The anti-k t jet clustering algorithm, JHEP 04 (2008) 063 [arXiv:0802.1189] [INSPIRE].ADSCrossRefGoogle Scholar
  23. [23]
    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
  24. [24]
    A. Martin, W. Stirling, R. Thorne and G. Watt, Heavy-quark mass dependence in global PDF analyses and 3- and 4-flavour parton distributions, Eur. Phys. J. C 70 (2010) 51 [arXiv:1007.2624] [INSPIRE].ADSCrossRefGoogle Scholar
  25. [25]
    R. Frederix, E. Re and P. Torrielli, Single-top t-channel hadroproduction in the four-flavour scheme with POWHEG and aMC@NLO, JHEP 09 (2012) 130 [arXiv:1207.5391] [INSPIRE].ADSCrossRefGoogle Scholar
  26. [26]
    W. Bernreuther, A. Brandenburg, Z. Si and P. Uwer, Top quark pair production and decay at hadron colliders, Nucl. Phys. B 690 (2004) 81 [hep-ph/0403035] [INSPIRE].ADSCrossRefGoogle Scholar
  27. [27]
    G. Mahlon and S.J. Parke, Improved spin basis for angular correlation studies in single top quark production at the Tevatron, Phys. Rev. D 55 (1997) 7249 [hep-ph/9611367] [INSPIRE].ADSGoogle Scholar
  28. [28]
    S. Dittmaier et al., Handbook of LHC Higgs cross sections: 2. Differential distributions, arXiv:1201.3084 [INSPIRE].

Copyright information

© SISSA 2013

Authors and Affiliations

  • Pierre Artoisenet
    • 1
    Email author
  • Rikkert Frederix
    • 2
  • Olivier Mattelaer
    • 3
  • Robbert Rietkerk
    • 1
    • 4
  1. 1.Nikhef Theory GroupAmsterdamThe Netherlands
  2. 2.PH Department, TH Unit, CERNGeneva 23Switzerland
  3. 3.Department of PhysicsUniversity of Illinois at Urbana-ChampaignUrbanaU.S.A
  4. 4.Institute for Theoretical PhysicsUniversity of AmsterdamAmsterdamThe Netherlands

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