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PHANTOM 1.0 Higgs, Top and Boson Boson Scattering Six fermion simulations at the LHC

PHANTOM 1.0 Higgs, Top and Boson Boson Scattering Six fermion simulations at the LHC. E. Maina U. Torino. MC4LHC July 17, 2006. Phantom Ballestrero, Belhouari,Bevilacqua,E.M. Dedicated event generator Complete 2 →6 O(α 6 )+O(α 4 α s 2 )

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PHANTOM 1.0 Higgs, Top and Boson Boson Scattering Six fermion simulations at the LHC

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  1. PHANTOM 1.0Higgs, Top and Boson Boson Scattering Six fermion simulations at the LHC E. Maina U. Torino MC4LHC July 17, 2006

  2. PhantomBallestrero, Belhouari,Bevilacqua,E.M. • Dedicated event generator • Complete 2→6 O(α6)+O(α4αs2) • q1q2→f1f2 f3 f4 f5f6 O(α6)+O(α4αs2) gg → f1f2 f3 f4 f5f6, gq→gq f1f2 f3 f4, qq→gg f1f2 f3 f4, • Exact matrix elements. No production⊗decay or EVBA • Fast • One-shot: generates unweighted events for all processes simultaneously • Efficient: good mapping of phase-space q1q2→q1q2 q3 q4 lv covered in Phase1.0 Accomando,Ballestrero,E.M. hep-ph/0504009

  3. VVscattering Higgs top VV couplings

  4. An interesting example: 1046 diagrams It includes: • ZZ → W+W- Higgs → WW • ZW- → ZW- • W-Z → ZW- • W-W- → W-W- • W- → W-W+W- 2 Higgs → WW channels • W- → ZZW- Higgs → ZZ

  5. Adaptive integration (VEGAS) • Adapts well to cuts • Rough estimate of integrand shape usually enough • Fails if too many peaks or along diagonals • Multichannel • Requires a large number of channels • All channels are integrated over simultaneously • Sensitive to cuts, efficiency generally small • Adapts varying the channel relative weight • Iterative-Adaptive Multichannel NEW! (Phase+Phantom) Merges best feautures of both! • Adapts well to cuts • Rough estimate of integrand shape enough • Small number of channels required (Multimapping) • Channels are integrated separately • Good efficiency • Grid generation • Event generation: one shot Two steps:

  6. After: Top veto, W mass cut qq→4qlvPHASE vs PYTHIA pTW>50 GeV in WW CM mH=500 GeV No Higgs PYTHIA has only LL in EVBA approximation

  7. PHASE vs MADEVENT uu→uuqqμν Single process qq=u-dbar,c-sbar MADEVENT: qqWV⊗Decay Could produce exact result Long CPU time Tuned comparison VVV production vetoed

  8. qq→4qlv(EW) M(VW)>800GeV +pT+E+η+Mij cuts Small sensitivity to MH in SM range ⇒ SM predictions well defined. Not just counting exp Accomando,Ballestrero,Bolognesi,E.M.,Mariotti JHEP 0603(2006)093 hep-ph/0512219

  9. Internal gluon QCD correctionswith G. Bevilacqua (Torino) Includes qq→tt No external g All qq→4qlv processes 70<M(jcjc)<90GeV First results: no real analysis

  10. Phantom 1.0 • Fast, efficient, dedicated event generator • Complete 2→6 O(α6)+O(α4αs2) • Exact, complete LO ME Projects: • t-tbar: spin correlations • qqWW→qqlνlν • Alternative models of EWSB

  11. qq→4qlv All particles outgoing Adding ud↔cs, e ↔μ, CC ⇒1K processes 16 amplitudes 2 basic sets of diags Total: 5 basic sets 4W, 2Z2W, 4Z 2gZ2W, 2g3Z

  12. First results qq→4qlv Accomando,Ballestrero,Bolognesi,E.M.,Mariotti hep-ph/0512219

  13. PHACT PLB350(95)225hep-ph/9911318

  14. I=〈f〉A ΔI∝〈(f−〈f〉)2 〉

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