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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 Tim Barklow SLAC ICHEP ’04 August 16, 2004
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
Beam Energy Profiles Before Collision Lumi Weighted After Collision WARM COLD Ebeam (GeV) Ebeam (GeV) Ebeam (GeV)
MH measurement using kinematic fit of qqll and qqbb Energy scale error
Simdet Detector Simulation of e+e- Zh Recoil Mass Statistical Errors: WARM COLD Recoil Mass (GeV)
Beam-Beam Backgrounds Hadronic 2-photon events at NLC/GLC • Good timing (1-4 BX) information needed to avoid pileup
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
1BX 4BX 20BX Beam-Beam Bgnd: Higgs Mass with 4-jet Final State H → bb,Z → qq Study by T. Abe and K. Desch
Higgs Boson Quantum Numbers TESLA TDR hep-ph/0106315
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.
All 2,4,6-fermion and top-resonance 8-fermion backgrounds included Background passing cuts (white histogram) is mostly Red histogram: Green histogram:
All 2,4,6-fermion and top-resonance 8-fermion backgrounds included Non-Higgs background (white histogram) is mostly Red histogram:
LHC/LC Measurement of top Yukawa Coupling K. Desch et al. hep-ph/0407159
LHC/LC Measurement of SUSY Higgs Parameters K. Desch et al. hep-ph/0406322 LC BR measurements serve as consistency check and probe At
Intense-Coupling Regime E. Boos et al. hep-ph/0307079 * MF (GeV) MA (GeV) * MA (GeV)
Intense-Coupling Regime MA (GeV) MA (GeV)
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.