Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: One Loop Corrections to the Rho Parameter in Higgsless Models   A large class of deconstructed Higgsless model is known to satisfy the
tree-level experimental bounds on the electroweak precision parameters. In
particular, an approximate custodial symmetry insures that the tree-level
$\rho$ parameter is exactly one, for arbitrary values of the model parameters,
and regardless of fermion delocalization. In this note we expand on previous
work by considering the fermionic one-loop contributions to $\rho$, which are
essentially due to loops with top and bottom modes. We analyze the dependence
on the number $N$ of internal SU(2) sites in models with a ``flat background''.
We find that the new-physics contribution rapidly increases with $N$, to
quickly stabilize for large values of $N$. Experimental upper bounds on $\rho$
translate into lower bounds on the mass of the heavy fermions. These, however,
are weakly correlated to $N$, and the three-site model (N=1) turns out to be
already an excellent approximation for the continuum model ($N\to\infty$).

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The categories of this paper are: nlin
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The categories of this paper are: chao-dyn
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The categories of this paper are: hep-th
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The categories of this paper are: cs
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The categories of this paper are: astro-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: stat
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The categories of this paper are: bayes-an
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The categories of this paper are: atom-ph
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The categories of this paper are: econ
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The categories of this paper are: q-fin
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The categories of this paper are: adap-org
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The categories of this paper are: acc-phys
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The categories of this paper are: physics
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The categories of this paper are: plasm-ph
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The categories of this paper are: cond-mat