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Spectrum and couplings of SO(5) x U(1) gauge-Higgs unification model in warped spacetime

Spectrum and couplings of SO(5) x U(1) gauge-Higgs unification model in warped spacetime. B-L. Yutaka Sakamura (Osaka Univ.) with Yutaka Hosotani (Osaka Univ.) Phys.Lett.B645 (2007) 442 March 2, 2007@KEK. Introduction. Structure of EW ： unspecified yet Standard Higgs mechanism

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Spectrum and couplings of SO(5) x U(1) gauge-Higgs unification model in warped spacetime

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  1. Spectrum and couplings of SO(5)xU(1) gauge-Higgs unification model in warped spacetime B-L Yutaka Sakamura (Osaka Univ.) with Yutaka Hosotani (Osaka Univ.) Phys.Lett.B645 (2007) 442 March 2, 2007@KEK

  2. Introduction Structure of EW：unspecified yet • Standard Higgs mechanism • Little Higgs model (N.Arkani-Hamed, et al., JHEP 0208 (2002) 021 ) • Higgsless model (C.Csaki, et al., PRD69 (2004) 055006) • Gauge-Higgs unification model (GHU)(N.Manton, NPB158 (1979)141, D.B.Fairlie, PLB82(1979)97,…)

  3. Introduction Structure of EW：unspecified yet • Standard Higgs mechanism • Little Higgs model (N.Arkani-Hamed, et al., JHEP 0208 (2002) 021 ) • Higgsless model (C.Csaki, et al., PRD69 (2004) 055006) • Gauge-Higgs unification model (GHU)(N.Manton, NPB158 (1979)141, D.B.Fairlie, PLB82(1979)97,…) In GHU, Higgs mass is protected by Higher dimensional gauge symmetry

  4. Simplest model (SU(3) model) • spacetime: 5D flat ( ) • gauge symmetry:

  5. 2 Z -Orbifold Parity Orbifold conditions:

  6. Higgs doublet

  7. Higgs doublet

  8. Higgs doublet • (gauge-invariant) Wilson line phase determined by quantum effect

  9. Relations among mass scales

  10. Warped spacetime Randall, Sundrum, PRL83 (1999) 3370

  11. Relations among mass scales (warped case) (Hosotani, Mabe, PLB615 (2005) 257)

  12. Problem of SU(3) model • Wrong value of the Weinberg angle • Rho parameter deviates from one.

  13. Problem of SU(3) model • Wrong value of the Weinberg angle • Rho parameter deviates from one.

  14. Problem of SU(3) model • Wrong value of the Weinberg angle • Rho parameter deviates from one.

  15. SO(5)xU(1) model B-L Agashe,Contino,Pomarol, NPB719(2005)165 Gauge fields:

  16. 5D action

  17. Symmetry breaking

  18. Symmetry breaking Higgs doublet

  19. Symmetry breaking

  20. Higgs doublet: By using residual symemtry, Wilson line phase:

  21. Mass spectrum W boson: Z boson:

  22. Weak gauge boson masses

  23. Gauge couplings Weinberg angle Rho parameter

  24. WWZ Coupling SM value

  25. WWH, ZZH couplings

  26. Summary B-L SO(5)xU(1) model in warped spacetime

  27. Future work • Specify the fermionic sector. • Include the quantum effects. • Determine the value of dynamically.

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