Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-05-22
Phys.Rev.D69:055006,2004
Physics
High Energy Physics
High Energy Physics - Phenomenology
33 pages, 3 figures included
Scientific paper
10.1103/PhysRevD.69.055006
We consider extra dimensional gauge theories on an interval. We first review the derivation of the consistent boundary conditions (BC's) from the action principle. These BC's include choices that give rise to breaking of the gauge symmetries. The boundary conditions could be chosen to coincide with those commonly applied in orbifold theories, but there are many more possibilities. To investigate the nature of gauge symmetry breaking via BC's we calculate the elastic scattering amplitudes for longitudinal gauge bosons. We find that using a consistent set of BC's the terms in these amplitudes that explicitly grow with energy always cancel without having to introduce any additional scalar degree of freedom, but rather by the exchange of Kaluza--Klein (KK) gauge bosons. This suggests that perhaps the SM Higgs could be completely eliminated in favor of some KK towers of gauge fields. We show that from the low-energy effective theory perspective this seems to be indeed possible. We display an extra dimensional toy model, where BC's introduce a symmetry breaking pattern and mass spectrum that resembles that in the standard model.
Csa'ki Csaba
Grojean Christophe
Murayama Hitoshi
Pilo Luigi
Terning John
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