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

Improved analysis of the bounds from the electroweak precision tests on the 4-site model
Improved analysis of the bounds from the electroweak precision tests on the 4-site model
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
1550-7998
115021-[17pp]
Accomando, Elena
8ebc75d7-bd92-4f70-a974-7bc15ebf088f
Becciolini, Diego
f25f7755-ebb8-48e8-a40a-a962a1c90548
De Curtis, Stefania
7bf1f7cf-535f-4551-8d05-806c57cfa2d1
Dominici, Daniele
aca95683-a4dd-4521-ab76-e132b61c6c58
Fedeli, Luca
1ddd6a40-9ad1-4453-9eda-b2122d20878b
Shepherd-Themistocleous, Claire
a29b4897-1b61-4774-8df7-0f507d905d81
Accomando, Elena
8ebc75d7-bd92-4f70-a974-7bc15ebf088f
Becciolini, Diego
f25f7755-ebb8-48e8-a40a-a962a1c90548
De Curtis, Stefania
7bf1f7cf-535f-4551-8d05-806c57cfa2d1
Dominici, Daniele
aca95683-a4dd-4521-ab76-e132b61c6c58
Fedeli, Luca
1ddd6a40-9ad1-4453-9eda-b2122d20878b
Shepherd-Themistocleous, Claire
a29b4897-1b61-4774-8df7-0f507d905d81

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).

Record type: Article

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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More information

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

Identifiers

Local EPrints ID: 339110
URI: https://eprints.soton.ac.uk/id/eprint/339110
ISSN: 1550-7998
PURE UUID: aebbd8b0-0af3-479c-acfe-da45987d554b

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Date deposited: 24 May 2012 09:06
Last modified: 16 Jul 2019 22:03

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