Spectrum and couplings of SO(5) x U(1) gauge-Higgs unification model in warped spacetime
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Transcript of Spectrum and couplings of SO(5) x U(1) gauge-Higgs unification model in warped spacetime
Spectrum and couplings of Spectrum and couplings of SO(5)SO(5)xxU(1) U(1)
gauge-Higgs unification model gauge-Higgs unification model in warped spacetimein warped spacetime
Yutaka Sakamura (Osaka Univ.)with Yutaka Hosotani (Osaka Univ.)
Phys.Lett.B645 (2007) 442
March 2, 2007@KEK
B-L
IntroductionStructure of EW : unspecified yetStandard 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,…)
IntroductionStructure of EW : unspecified yetStandard 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 byHigher dimensional gauge symmetry
spacetime: 5D flat ( )
gauge symmetry:
Simplest model (SU(3) model)
Z -Orbifold Parity
Orbifold conditions:
2
Higgs doublet
• Higgs doublet
• Higgs doublet
• (gauge-invariant) Wilson line phase
determined by quantum effect
Relations among mass scales
Warped spacetime Randall, Sundrum, PRL83 (1999) 3370
Relations among mass scales (warped case)(Hosotani, Mabe, PLB615 (2005) 257)
Problem of SU(3) model
• Wrong value of the Weinberg angle
• Rho parameter deviates from one.
Problem of SU(3) model
• Wrong value of the Weinberg angle
• Rho parameter deviates from one.
Problem of SU(3) model
• Wrong value of the Weinberg angle
• Rho parameter deviates from one.
SO(5)xU(1) modelB-L
Gauge fields:
Agashe,Contino,Pomarol, NPB719(2005)165
5D action
Symmetry breaking
Symmetry breaking
Higgs doublet
Symmetry breaking
Higgs doublet:
By using residual symemtry,
Wilson line phase:
Mass spectrum
W boson:
Z boson:
Weak gauge boson masses
Gauge couplings
Weinberg angle
Rho parameter
WWZ Coupling
SM value
WWH, ZZH couplings
Summary
SO(5)xU(1) model in warped spacetimeB-L
Future work
• Specify the fermionic sector.
• Include the quantum effects.
• Determine the value of dynamically.