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Moose models with vanishing $S$ parameter | | R. Casalbuoni
; S. De Curtis
; D. Dominici
; | | Date: |
19 May 2004 | | Journal: | Phys.Rev. D70 (2004) 055010 | | Subject: | hep-ph hep-th | | Abstract: | In the linear moose framework, which naturally emerges in deconstruction models, we show that there is a unique solution for the vanishing of the $S$ parameter at the lowest order in the weak interactions. We consider an effective gauge theory based on $K$ SU(2) gauge groups, $K+1$ chiral fields and electroweak groups $SU(2)_L$ and $U(1)_Y$ at the ends of the chain of the moose. $S$ vanishes when a link in the moose chain is cut. As a consequence one has to introduce a dynamical non local field connecting the two ends of the moose. Then the model acquires an additional custodial symmetry which protects this result. We examine also the possibility of a strong suppression of $S$ through an exponential behavior of the link couplings as suggested by Randall Sundrum metric. | | Source: | arXiv, hep-ph/0405188 | | Services: | Forum | Review | PDF | Favorites | |
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