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Prospect after discoveries of Higgs/SUSY

Prospect after discoveries of Higgs/SUSY. Yasuhiro Okada (KEK) “Discoveries of Higgs and Supersymmetry to Pioneer Particle Physics in the 21 st Century” November 25, 2005, Univ. of Tokyo. (1) Higgs Physics.

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Prospect after discoveries of Higgs/SUSY

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  1. Prospect after discoveries of Higgs/SUSY Yasuhiro Okada (KEK) “Discoveries of Higgs and Supersymmetry to Pioneer Particle Physics in the 21st Century” November 25, 2005, Univ. of Tokyo

  2. (1) Higgs Physics • Finding the mass-generation mechanism for gauge bosons, quarks and leptons the most urgent question of the present particle physics. • Discovery of the Higgs boson is the first step. • The answer is most probably related to what is physics beyond the standard model. The electroweak symmetry breaking requires dynamics beyond the SU(3)xSU(2)xU(1) gauge interactions.

  3. How we have come to understand the strong interaction. Structure of a nucleus (proton / neutron) Discovery of Yukawa meson Quark model QCD Discovery of the Higgs boson is similar to discovery of the Yukawa meson in understanding the weak interaction. Weak interaction Higgs mechanism Dynamics behind the EW symmetry breaking

  4. A Higgs sector is unknown : How many Higgs bosons? (is there any?) What is the mass ? What is SU(2) representation? Even if one Higgs doublet model is a good description, What is f? What physics determines –m^2? What physics determines l? Different scenarios provides different answers. SUSY, String Theory Composite model, Little Higgs model TeV scale extra dimension

  5. a ~10 TeV Gauge force Gravity Composite model SUSY GUT Extra dimension Various new physics signals are expected in the TeV region, depending on different signals.

  6. Higgs mass Large Higgs mass  Large self-coupling  Strong dynamics If we require that the SM is valid up to 10^19 GeV,

  7. 200 mh=100 GeV 300 500 1000 Two interesting cases (2) High mass Higgs boson (>300 GeV) (1) Low mass Higgs boson (< 130 GeV) M.Peskin and J.Wells SUSY (mh< 135 GeV for MSSM) or Higgs potential is generated at low energy scale (< 0(10) TeV ) Ex. Pseudo Nambu-Goldstone boson Something is needed to be consistent with the EW precision data.

  8. Higgs coupling LHC 0(10)% for ratio of the coupling constants ILC A few % for absolute values of various coupling

  9. Indirect constraint on the heavy Higgs boson mass in MSSM Direct search at LHC Direct search at 1TeV LC ACFA Higgs WG S. Kiyoura, et al ACFA report

  10. SUSY loop contributions to the hbb Yukawa coupling B(h->bb)/B(h->tt) nomalized by SM value B(h->bb)/B(h->tt) is sensitive to the SUSY loop correction to the bottom Yukawa coupling for a large tanb region. LC LHC K.S.Babu, C.Kolda: M.Carena, D.Garcia, U.Nierste, C.E.M.Wagner J.Guasch, W.Hollik,S.Penaranda

  11. Higgs self-coupling measurement Access to the Higgs potential. Precision at 1/ab for 120 GeV Higgs boson ~20% for 500GeV ILC ~10% for 1 TeV ILC Y.Yasui, et al, LCWS 02

  12. Electroweak Baryogenesis First order phase transition Extension of the Higgs sector Electroweak baryogenesis and Higgs potential The Higgs potential at zero temperature is also modified. => Self coupling measurement Model with dim 6 potential 2HDM S.Kaenmura, Y. Okada, E.Senaha C.Grojean,G.Servant, J.D.Wells

  13. (2) Supersymmetry • Supersymmetry is a revolution of physics similar to relativity, if it is found. • SUSY provides a coherent picture of particle physics and cosmology SUSY + GUT => Gauge coupling unification SUSY + R parity => Dark matter SUSY + Seesaw neutrino => Leptogenesis (Baryon number of the Universe) After we confirm the supersymmetry, whether these ideas are realized could be central issues.

  14. SUSY and GUT LHC/LC combined analysis SUSYbreaking scenario G.A.Blair, W.Porod,and P.M.Zerwas

  15. Dark matter ALCPG cosmology subgroup SUSY mass and coupling measurements => Identification of dark matter PLANCK WMAP

  16. SUSY Seesaw model Large Lepton flavor violation processes are expected. m->eg in SU(5) SUSY GUT with seesaw neutrino Slepton flavor mixing J.Hisano, M.M.Nojiri, Y.Shimizu, M.Tanaka T.Goto,Y.Shimizu,T.Shindo,M.Tanaka and Y.Okada.

  17. Conclusions • Discovery of the Higgs boson is the first step to understand the dynamics of the electroweak symmetry breaking. • Measurements of the Higgs coupling constants can provide hints to new physics. • SUSY, if it exists, has far-reaching consequences in particle physics and cosmology.

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