出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：In the linear moose framework, which naturally emerges in deconstruction models, we discuss the
effect of direct couplings between the left-handed fermions living on the boundary of the chain
and the gauge fields in the internal sites. This is realized by means of a product of nonlinear
sigma-model scalar fields which, in the continuum limit, is equivalent to aWilson line. The effect
of these new nonlocal couplings is a contribution to the S parameter which can be of opposite
sign with respect to the one coming from the gauge fields along the string. Therefore, with some
fine-tuning, it is possible to satisfy the constraints from the electro-weak data without spoiling
the perturbative unitarity limit, which, in these models is generally postponed with respect to the
Higgsless Standard Model one.
