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Higgs Vector Boson Fusion Production and Detection at the Tevatron

Rick St. Denis – Glasgow University. Higgs Vector Boson Fusion Production and Detection at the Tevatron. Outline. Vector Boson Fusion Production of Higgs Production cross sections and comparisons to current Tevatron favorite channels Event characteristics at M H =130, 160, 200 GeV/c 2

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Higgs Vector Boson Fusion Production and Detection at the Tevatron

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  1. Rick St. Denis – Glasgow University Higgs Vector Boson Fusion Production and Detection at the Tevatron

  2. Outline • Vector Boson Fusion Production of Higgs • Production cross sections and comparisons to current Tevatron favorite channels • Event characteristics at MH=130, 160, 200 GeV/c2 • Comparison to LHC

  3. nm q' q W+ W+ m+ H0 W- W- q e- e- q' ne VBF Production Features • Missing Et • High Pt Leptons • 2 forward jets, opposite in rapidity, high mass • Spin 0 Higgs correlates spins of leptons: e,mparallel and neutrinos also • Dhe-jet about 1-1.5

  4. Kraemer vs Pythia

  5. Production:Check Pythia, Kraemer, Spira Below 1

  6. ZH corrections

  7. Interesting Diversion: pp vs ppbar ZH WH VBF gg

  8. d u u W+ W- u u d u d pp: W+ d W- u,d U U D U U D ppbar: U U D U U D u,d VBF 25% Better in PbarP d Hence: Ratio is 5/4 = 1.25 4 chances 5 chances

  9. Check of Higgs Branching Ratios B WW ZZ

  10. Check of Higgs BR: Pythia/Spira 20-25% differences

  11. Apply NLO to Pythia WH(lnbb) Used WW correction For VBF Total ZH(nnbb) ZH(llbb) gg-WW WH-WWW VBF

  12. For 8fb-1

  13. nm q' ^ s q W+ W+ m+ H0 W- W- q e- e- q' ne Study Characteristics at 130, 160, 200

  14. Tev, MH=160 Pt, Rapidity of Leptons, Jets Pt Quark can be low Reasonably Triggerable Electron In CDF Quark Forward

  15. Tev, MH=160 Rapidity of two quarks Max h of 2 quarks Min h of 2 quarks Dh of 2 quarks

  16. Tev, MH=160 Missing Energy Met vs Pte 60 GeV Met Met 180o from e Quark can be along Met

  17. Tev, MH=160 Lepton Correlations:e-ne Df (e,ne) e,neanticorrelated in f

  18. Tev, MH=160 Lepton Correlations: e-m e,m correlated in y,phi and have high pt DR

  19. Tev, MH=160 Masses Mt for e m n Large Invariant Mass between leptons High Invariant Mass between quarks

  20. Tev, MH=160 Electron-Jet Separation

  21. Mh=130 GeV/c2, Tevatron

  22. Tev, MH=130 Pt, Rapidity of Leptons, Jets Pt Quark can be low Less Triggerable Electron In CDF Quark Forward, like 160

  23. Tev, MH=130 Rapidity of two quarks Max h of 2 quarks Min h of 2 quarks Dh of 2 quarks

  24. Tev, MH=130 Missing Energy Less Missing Et, slightly lower pt leptons Met , q less correlated Met , e less correlated

  25. Tev, MH=130 Lepton Correlations:e-ne Df (e,ne) e,ne less anticorrelated in f

  26. Tev, MH=130 Lepton Correlations e,m not as correlated DR

  27. Tev, MH=130 Masses Mt for e m n Slightly less Invariant Mass between leptons Less Invariant Mass between quarks

  28. Tev, MH=130 Electron-Jet Separation Same Separation

  29. Mh=200 GeV/c2, Tevatron

  30. Tev, MH=200 Pt, Rapidity of Leptons, Jets Pt Quark can be low More Triggerable Quark still Forward, not much change Electron In CDF

  31. Tev, MH=200 Rapidity of two quarks Max h of 2 quarks Min h of 2 quarks Not Much Change Dh of 2 quarks

  32. Tev, MH=200 Missing Energy Higher Missing Et, Higher pt leptons Met , e stronger corr. Met , q same

  33. Tev, MH=200 Lepton Correlations e,m much less correlated

  34. Tev, MH=200 Lepton Correlations:e-ne Df (e,ne) e,ne more anticorrelated, in f but not at 180o

  35. Larger Invariant Mass between leptons Tev, MH=200 Masses Mt for e m n Larger Invariant Mass between quarks

  36. Tev, MH=200 Electron-Jet Separation Same l-j separation

  37. Mh=160 GeV/c2, LHC

  38. LHC, MH=160 Pt, Rapidity of Leptons, Jets Pt Quark can be low Reasonably Triggerable Electron In CDF: wider distn At LHC Quark more Forward

  39. LHC, MH=160 Rapidity of two quarks Max h of 2 Quarks wider Min h – wider Dh of 2 Quarks wider

  40. LHC, MH=160 Missing Energy A bit larger at LHC

  41. LHC, MH=160 Lepton Correlations:e-ne Df (e,ne) e,ne anticorrelated less sharply in f

  42. LHC, MH=160 Lepton Correlations e,m better correlated

  43. LHC, MH=160 Masses Mt for e m n Larger Invariant Mass between leptons Higher Invariant Mass between quarks

  44. LHC, MH=160 Electron-Jet Separation Same l-j separation

  45. Conclusions • Cross sections and widths disagree at 20% level • NLO variation with scale can be large • Yield of VBF about 10% of gg->WW can enhance after cuts • MET, Et and rapidity coverage for CDF electrons fine, muons may need tricks using e m signal correlation • Large missing Energy, Lepton correlations due to spin, Invariant mass of tagging jets good handles.

  46. Conclusions (cont) • Best at 160, suffers some e-mu decorrelation and lower pt for lower masses, emu decorrelation but higher pt at higher mass. • Detection in this mode relies on spin of Higgs: if you find it, how much have you also measured that it is spin 0?

  47. Next Steps • Check Cross section for VBF properly • Check correlations in MET, e, m, jet for help in mass reco/ efficiency • Study backgrounds for same distributions • Develop estimators: avoid hard cuts in order to conserve events • Move on to real simluations • Study W to jet possibility, Higgs to t

  48. Spare Slides

  49. nm q' ^ s q W+ W+ m+ H0 W- W- q e- e- q' ne ^ s ^ s ^ s Kinematics • : The local CM - pay for this with PDF • MW Can keep small with W off shell • MH Can also reduce with H off shell • Can emit ISR to give pt to H, but costs PDF

  50. nm q' q W+ W+ m+ H0 W- W- q e- e- q' ne Vector Boson fusion Production

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