Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-07-15
Phys.Rev.D78:055020,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
13pages, 5figures, minor corrections made, references added
Scientific paper
10.1103/PhysRevD.78.055020
We complete the list of one loop renormalization group equations and matching conditions relevant for the computation of the electroweak precision parameters $S$ and $T$ in the three site Higgsless model. We obtain one-loop formulas for $S$ and $T$ expressed in terms of physical observables such as the KK gauge boson mass $M_{W'}$, the KK fermion mass $M$, and the KK gauge boson ($W'$) couplings with light quarks and leptons $g_{W'ff}$. It is shown that these physical observables, $M_{W'}$, $M$ and $g_{W'ff}$ are severely constrained by the electroweak precision data. Unlike the tree level analysis on the ideally delocalized fermion, we find that perfect fermiophobity of $W'$ is ruled out by the precision data. We also study the cutoff dependence of our analysis. Although the model is non-renormalizable, the dependence on the cutoff parameter $\Lambda$ is shown to be non-significant.
Abe Tomohiro
Matsuzaki Shinya
Tanabashi Masaharu
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