Abstract
It is quite possible that the Technicolor problems are related to the poorly known self-energy expression, or the way chiral symmetry breaking (CSB) is realized in non-abelian gauge theories. Actually, the only known laboratory to test the CSB mechanism is QCD. The TC dynamics may be quite different from the QCD , this fact has led to the walking TC proposal making the new strong interaction almost conformal and changing appreciably its dynamical behavior. There are different ways to obtain of extreme walking (or quasi-conformal) technicolor theories, in this paper we propose an scheme to obtain this behavior based on an extension of the electroweak sector of the standard model, in the context of so called 331-TC model.
Highlights
The 125 GeV new resonance discovered at the LHC [1,2] has many of the characteristics expected for the standard model (SM) Higgs boson
In Ref. [42] we considered the possibility of a light composite scalar boson arising from mass mixing between a relatively light and heavy scalar singlets from a see-saw mechanism expected to occur in two-scale technicolor (TC) models and we concluded that, regardless of the approach used for generating a light composite scalar boson, the behavior exhibited by extreme walking technicolor theories is the main feature needed to produce a light composite scalar boson compatible with the boson observed at the LHC
After this brief motivation of the importance of extreme walking behavior to generate a light composite scalar boson in TC models, in addition to possibility of 331-TC model contain the necessary requirements to explain the anomaly in diboson production, in this paper we propose a scheme to obtain the quasi-conformal behavior based on an extension of the electroweak sector of the standard model, 331-TC model (SU (N )T C ⊗ [SU (3)L ⊗ SU (3)c ⊗ U (1)X ])
Summary
The 125 GeV new resonance discovered at the LHC [1,2] has many of the characteristics expected for the standard model (SM) Higgs boson. [19] it was suggested that the gauge symmetry breaking of a specific version of a 3-3-1 model [6,7,8,9,10,11,12] would be implemented dynamically because at the scale of a few TeVs the U (1)X coupling constant becomes strong and the exotic quark T (charge 5/3) will form a U (1)X condensate breaking SU (3)L ⊗ U (1)X to the electroweak symmetry This possibility was explored by us in Ref. We can obtain an almost conformal TC theory, when the fermions are in the fundamental representation, introducing a large number of TC fermions (nT F ), leading to an almost zero β function and flat asymptotic coupling constant The cost of such procedure may be a large S parameter [34,35] incompatible with the high precision electroweak measurements only if we assumed that technicolor is just QCD scaled up to a higher energy [36]. This problem can be solved by assuming that TC fermions are in other representations than
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