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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).

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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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e-pub ahead of print date: May 2011
Published date: June 2011
Organisations: Theoretical Partical Physics Group


Local EPrints ID: 339110
ISSN: 1550-7998
PURE UUID: aebbd8b0-0af3-479c-acfe-da45987d554b

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Date deposited: 24 May 2012 09:06
Last modified: 18 Jul 2017 05:54

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Author: Elena Accomando
Author: Diego Becciolini
Author: Stefania De Curtis
Author: Daniele Dominici
Author: Luca Fedeli
Author: Claire Shepherd-Themistocleous

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