Improved analysis of the bounds from the electroweak precision tests on the 4-site model

Accomando, Elena, Becciolini, Diego, De Curtis, Stefania, Dominici, Daniele, Fedeli, Luca and Shepherd-Themistocleous, Claire (2011) Improved analysis of the bounds from the electroweak precision tests on the 4-site model. Physical Review D, 83 (11), 115021-[17pp]. (doi:10.1103/PhysRevD.83.115021).

Abstract

We present a new complete analysis of the electroweak precision observables within the recently proposed 4-site Higgsless model, which is based on the SU(2)L×SU(2)1×SU(2)2×U(1)Y gauge symmetry and predicts six extra gauge bosons, W1,2± and Z1,2. Within the ?i (i=1, 2, 3, b) parametrization, we compute for the first time the electroweak precision test bounds via a complete numerical algorithm going beyond commonly used approximations. Both ?1,3 impose strong constraints. Hence, it is mandatory to consider them jointly when extracting electroweak precision test bounds and to fully take into account the correlations among the electroweak precision measurements. The phenomenological consequence is that the extra gauge bosons must be heavier than 250 GeV. Their couplings to SM fermions, even if bounded, might be of the same order of magnitude than the SM ones. In contrast to other Higgsless models, the 4-site model is not fermiophobic. The new gauge bosons could thus be discovered in the favored Drell-Yan channel already during the present run of the LHC experiment

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