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Higgs Physics at a Linear Collider

Higgs Physics at a Linear Collider. Tim Barklow SLAC ICHEP ’04 August 16, 2004. TALK OUTLINE Emphasis on Recent Progress. Beam Related Sys Errors in Higgs Physics Higgs Boson Quantum Numbers Studies at Ecm=1TeV: Higgs Self Coupling Measurement Higgs Branching Fractions

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Higgs Physics at a Linear Collider

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  1. Higgs Physics at a Linear Collider Tim Barklow SLAC ICHEP ’04 August 16, 2004

  2. TALK OUTLINEEmphasis on Recent Progress • Beam Related Sys Errors in Higgs Physics • Higgs Boson Quantum Numbers • Studies at Ecm=1TeV: Higgs Self Coupling Measurement Higgs Branching Fractions • LHC/LC Complementarity: Top Yukawa Coupling Measurement SUSY Higgs Consistency Check and At Measurement SUSY Higgs Physics in the Intense-Coupling Regime

  3. Beam Energy Profiles Before Collision Lumi Weighted After Collision WARM COLD Ebeam (GeV) Ebeam (GeV) Ebeam (GeV)

  4. MH measurement using kinematic fit of qqll and qqbb Energy scale error

  5. Simdet Detector Simulation of e+e-  Zh Recoil Mass Statistical Errors: WARM COLD Recoil Mass (GeV)

  6. MSSM theory error on Mh : (S. Heinemeyer at LCWS 04, Paris)

  7. Factor of 2 reduction in dMh going from Ecm=300 to 240 GeV

  8. Beam-Beam Backgrounds Hadronic 2-photon events at NLC/GLC • Good timing (1-4 BX) information needed to avoid pileup

  9. Beam-Beam Bgnd: Higgs Production at 1 TeV 4 BX 1 BX Mvisible (GeV) Mvisible (GeV) (S/B = 8.0) • 2 missing neutrinos, no constrained fit possible • important for model-independent determination • of partial width H → WW (S/B = 13.2) Similar to study by K. Desch et al., LC-PHSM-2004-009

  10. 1BX 4BX 20BX Beam-Beam Bgnd: Higgs Mass with 4-jet Final State H → bb,Z → qq Study by T. Abe and K. Desch

  11. Higgs Boson Quantum Numbers TESLA TDR hep-ph/0106315

  12. HIGGS SELF-COUPLING SUMMARY

  13. Higgs Coupling Measurements at 1 TeV T. Barklow hep-ph/0312268 CLIC Studies Demonstrated that Higgs Production through WW fusion at Ecm=3 TeV Could Probe Rare Higgs Decays. What about WW fusion at a 1 TeV LC? Results presented for No results for since detailed charm-tagging beyond scope and Higgs mass resolution for severely degraded by neutrinos.

  14. All 2,4,6-fermion and top-resonance 8-fermion backgrounds included Background passing cuts (white histogram) is mostly Red histogram: Green histogram:

  15. All 2,4,6-fermion and top-resonance 8-fermion backgrounds included Non-Higgs background (white histogram) is mostly Red histogram:

  16. LHC/LC Measurement of top Yukawa Coupling K. Desch et al. hep-ph/0407159

  17. LHC/LC Measurement of SUSY Higgs Parameters K. Desch et al. hep-ph/0406322 LC BR measurements serve as consistency check and probe At

  18. Intense-Coupling Regime E. Boos et al. hep-ph/0307079 * MF (GeV) MA (GeV) * MA (GeV)

  19. Intense-Coupling Regime

  20. Intense-Coupling Regime MA (GeV) MA (GeV)

  21. Intense-Coupling Regime

  22. Intense-Coupling Regime

  23. Summary of Recent Progress • Beam related systematic errors have been evaluated for LC Higgs measurements, providing improved estimates of experimental precision and guidance for detector design. • Higgs physics studies at Ecm=1 TeV lead to improved BR and self-coupling precision, even if MH < 200 GeV. • Many examples of LHC/LC complementarity found in Higgs & SUSY physics. The LC’s few hundred MeV Higgs mass measurement and few percent BR measurements are repeatedly utilized in these studies.

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