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Hong-Jian He Tsinghua University

9th ACFA ILC Workshop Physics Session Summary. Hong-Jian He Tsinghua University. Feb. 4-7, 2007, IHEP, Beijing. LHC 2007-. Consensus: “Future” of ILC strongly depends on What New Phys LHC will discover. Zhengguo Zhao, ( Anomalous Gauge Boson Coupling )

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Hong-Jian He Tsinghua University

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  1. 9th ACFA ILCWorkshop Physics Session Summary Hong-Jian He Tsinghua University Feb. 4-7, 2007, IHEP, Beijing

  2. LHC 2007- Consensus: “Future” of ILC strongly depends on What New PhysLHC will discover.

  3. Zhengguo Zhao, ( Anomalous Gauge Boson Coupling ) Diboson Production and Triple Gauge Boson Couplings at TeV Hadron Collider • Denis Perret-Gallix, ( Calculation Tool: Grace ) Simulate with Grace • Kingman Cheung, ( Higgs: Very Light A0) Phenomenology of the Light Pseudoscalar Boson in NMSSM • Eri Asakawa, ( Exotic Higgs-Gauge-Coupling: H＋W－Z0) Potential for Measuring the H＋W－Z0vertex at colliders • Liang Han, ( NLO EW Corrections ) Theoretical Calculation for ILC Precise Measurement • Jin Min Yang, ( SUSY: Splitting Model ) Split Supersymmetry at ILC • Shou-hua Zhu, ( Exotic Higgs A0: 0.215GeV ) Unique Higgs Boson Signature at Colliders • Koichi Matsuda, ( Anomalous Higgs Yukawa: ee→ννtt, ee→htt ) • New Physics Search by Helicity Decomposition of Heavy Fermion Pair-Production from W-boson Fusion at LHC/ILC • Hideo Itoh, ( SUSY-breaking/brane world: TeV-scale X ) Low scale supergravity mediation in brane world scenario and hidden sector Phenomenology • W. Lohmann, ( Higgs: Detector Full simulation/Reconstruction ) Study of ee→Zh→llX using full detector simulation and exact reconstruction

  4. Central Physics Issues for LHC & ILC • Why TeV Scale ? • What New Physics ? • How to Compute/Observe: Signals vs Bkgnds ? • How does ILC play Complementarity to LHC?

  5. New Physics at TeV Scale ?? Which is Guaranteed ?? Higgs Higgsless

  6. New Physics at TeV Scale ? • Hierarchy/Fine-Tuning Problem ? →Not strong enough ! • Unification ? →Many possible realizations ! • Light Higgs ? →Not enforced by data ! • Then, WHAT best justifies TeV Scale? …

  7. Fine-Tuning Problem ? ● Radiative Corrections to Higgs Mass: ●Degree of Fine-Tuning (DFT): DFT = 2002/[|-20002+5202+4602|*(Λ/10TeV)2]

  8. Fine-Tuning is aTechnical Problem ! Λ=11TeV 3.5TeV 2.5TeV Not strong enough for LHC/ILC!

  9. SM Higgs Potential runs intomore seriousVacuum Energy Problemeven at Tree-Level: (eg, S.Weinberg,1989) <ρ> = Vmin–λv4/4 = Vmin－O(100GeV)4 == (10- 4eV)4 →60 Ordersof Magnitude Fine-tuning ! → So, Why do we care 1% Tuning at 1-Loop ?!

  10. Unification without SUSY? → YES. →Many possible realizations !!! Trinification 5d TeV GUT • Trinification with just 6 Higgs doublets (Willenbrock et al, 2003) • 5d TeV GUT with just 3 real scalars of SU(2)-adjoint (Dienes etal, 1998) • And more: Efficacious Unification with 2 scalar octocts, 1 triplet scalar, 1 triplet majorana fermiom, which also predicts dark matter, as good as Splitting SUSY (E. Ma, 05), ………

  11. A Misconception:LightHiggs from Data ? 114.4 < MH< 260GeV (95%CL) →Could be True Only If No New Physics& Higgs wasExactly SM-like!

  12. Heavy Higgs vs Precision Data:No Problem ! R. S. Chivvukula, Snowmass-2001 H. J. He, Snowmass-2001 Top Seesaw Model

  13. SUSY with Heavy Higgs:OK… See Y. Nomura’s talk, hep-ph/0607332 ● λSH1H2remains perturbative up to about 10TeV ● Mhis heavy, up to 300GeV ●Higgs/Higgsino: 200-700GeV Called “λSUSY”

  14. Lesson for LHC & ILC: Keep Your Mind Fully Open !!!

  15. The Real Problem with Particle Masses is Unitarity Violation in the High Energy Scattering !!!!!

  16. Unitarity of WLWL → WLWL: Electroweak Symmetry Breaking Scale →Stronger & More RobustthanFine-tuning bound !

  17. Scales of Fermion Mass Generation

  18. →Future: After LHC/ILC !

  19. How to Observe ? K. Cheung’s talk: NMSSM Large tanβ& vs S.H. Zhu’s Talk ee→Zh→Z+4μ J.M. Yang’s talk: Splitting SUSY

  20. Probing Higgsless Parameters:E vs PolarizationHan, He, Yuan

  21. Higgsless Model: New W’ at ILC

  22. Conclusions • Why TeV Scale:Unitarity of WLWL → WLWL ILC must be upgradeable to 1TeV ! • What New Physics:Many Kinds – Keep your Mind Open !!! Light Higgs or Heavy Higgs or Higgsless; SUSY or Splitting SUSY or SUSY-Less; 4-Dimension or Extra-d or Deconstruction… • How to Compute/Observe at ILC: Signals vs Bkgnds New Channels, Beam polarizations, e-e- Mode, Photon-collider, …… • ILC playsComplementarity: Precision Test, Loop Effects, ……

  23. Thank You!

  24. Back Up Slides

  25. VLHC: http://vlhc.org(50-200TeV)

  26. New Phys

  27. LHC ILC

  28. Importance of Photon Collider & Polarization (Charged Higgs Boson Production)

  29. Different SUSY Breakings and Particle Spectrum: Need Precision Tests at ILC!

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