One-loop corrections to the S parameter in the four-site model
- Department of Physics, Brookhaven National Laboratory, Upton, New York 11973 (United States)
- HEP Division, Argonne National Laboratory, 9700 Cass Avenue, Argonne, Illinois 60439 (United States)
We compute the leading chiral-logarithmic corrections to the S parameter in the four-site Higgsless model. In addition to the usual electroweak gauge bosons of the standard model, this model contains two sets of heavy charged and neutral gauge bosons. In the continuum limit, the latter gauge bosons can be identified with the first excited Kaluza-Klein states of the W{sup {+-}} and Z bosons of a warped extra-dimensional model with an SU(2){sub L}xSU(2){sub R}xU(1){sub X} bulk gauge symmetry. We consider delocalized fermions and show that the delocalization parameter must be considerably tuned from its tree-level ideal value in order to reconcile experimental constraints with the one-loop results. Hence, the delocalization of fermions does not solve the problem of large contributions to the S parameter in this class of theories and significant contributions to S can potentially occur at one-loop.
- OSTI ID:
- 21254675
- Journal Information:
- Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 1 Vol. 79; ISSN PRVDAQ; ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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