spectrum and couplings of so 5 x u 1 gauge higgs unification model in warped spacetime
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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

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

introduction
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,…)
introduction1
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

simplest model su 3 model
Simplest model (SU(3) model)
  • spacetime: 5D flat ( )
  • gauge symmetry:
slide5

2

Z -Orbifold Parity

Orbifold conditions:

slide9
Higgs doublet
  • (gauge-invariant) Wilson line phase

determined by quantum effect

slide13

Warped spacetime

Randall, Sundrum, PRL83 (1999) 3370

slide14

Relations among mass scales (warped case)

(Hosotani, Mabe, PLB615 (2005) 257)

slide15
Problem of SU(3) model
  • Wrong value of the Weinberg angle
  • Rho parameter deviates from one.
slide16
Problem of SU(3) model
  • Wrong value of the Weinberg angle
  • Rho parameter deviates from one.
slide17
Problem of SU(3) model
  • Wrong value of the Weinberg angle
  • Rho parameter deviates from one.
slide18

SO(5)xU(1) model

B-L

Agashe,Contino,Pomarol, NPB719(2005)165

Gauge fields:

slide21

Symmetry breaking

Higgs doublet

slide24

Higgs doublet:

By using residual symemtry,

Wilson line phase:

slide25

Mass spectrum

W boson:

Z boson:

slide28

Gauge couplings

Weinberg angle

Rho parameter

slide29

WWZ Coupling

SM value

summary
Summary

B-L

SO(5)xU(1) model in warped spacetime

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