The Soft-Wall Standard Model

Details The Soft-Wall Standard Model The Soft-Wall Standard Model

2008-08-28

arxiv.org/abs/0808.3977v1

Phys.Rev.D78:116011,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

32 pages, 3 figures

Scientific paper

10.1103/PhysRevD.78.116011

We explore the possibility of modeling electroweak physics in a warped extra dimension with a soft wall. The infrared boundary is replaced with a smoothly varying dilaton field that provides a dynamical spacetime cutoff. We analyze gravity, gauge fields, and fermions in the soft-wall background and obtain a discrete spectrum of Kaluza-Klein states which can exhibit linear Regge-like behavior. Bulk Yukawa interactions give rise to nonconstant fermion mass terms, leading to fermion localization in the soft-wall background and a possible explanation of the Standard Model flavor structure. Furthermore we construct electroweak models with custodial symmetry, where the gauge symmetry is broken with a bulk Higgs condensate. The electroweak constraints are not as stringent as in hard-wall models, allowing Kaluza-Klein masses of order the TeV scale.

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