6,984 research outputs found
Discriminating between technicolor and warped extra dimensional model via pp ZZ channel
We explore the possibility to discriminate between certain strongly-coupled
technicolor (TC) models and warped extra-dimensional models where the Standard
Model fields are propagating in the extra dimension. We consider a generic
QCD-like TC model with running coupling as well as two TC models with walking
dynamics. We argue that due to the different production mechanisms for the
lowest-lying composite tensor state in these TC theories compared to the first
Kaluza-Klein graviton mode of warped extra-dimensional case, it is possible to
distinguish between these models based on the angular analysis of the
reconstructed longitudinal Z bosons in the four charged
leptons channel.Comment: 16 pages, 3 figures, 1 tabl
Flavor constraints in a Bosonic Technicolor model
Flavor constraints in a bosonic Technicolor model are considered. We
illustrate different sources for their origin, and emphasize in particular the
role played by the vector states present in the Technicolor model. This feature
is the essential difference in comparison to an analogous model with two
fundamental Higgs scalar doublets.Comment: 16 pages, 13 figure
Deconfinement vs. chiral symmetry and higher representation matter
The interplay of deconfinement and chiral symmetry restoration are considered
in terms of effective theories. We generalize the earlier model studies by
considering fermions in higher representations, and study the finite
temperature phase diagrams of SU(2) and SU(3) gauge theories with two fermion
flavors in fundamental, adjoint or two-index symmetric representations. We
discuss our results in relation to recent lattice simulations on these theories
and outline possible applications in the context of dynamical electroweak
symmetry breaking.Comment: 13 pages, 6 figure
Minimal Super Technicolor
We introduce novel extensions of the Standard Model featuring a
supersymmetric technicolor sector. First we consider N=4 Super Yang-Mills which
breaks to N=1 via the electroweak (EW) interactions and coupling to the MSSM.
This is a well defined, economical and calculable extension of the SM involving
the smallest number of fields. It constitutes an explicit example of a natural
supersymmetric conformal extension of the Standard Model featuring a well
defined connection to string theory. It allows to interpolate, depending on how
we break the underlying supersymmetry, between unparticle physics and Minimal
Walking Technicolor. As a second alternative we consider other N =1 extensions
of the Minimal Walking Technicolor model. The new models allow all the standard
model matter fields to acquire a mass.Comment: Improved version demonstrating that this extension is
phenomenologically viable. No Landau pole exists in the theory to two loops
level. This is the first theory showing that supersymmetry can solve the
flavor problem when coupled to low energy technicolo
Confinement and Chiral Symmetry
We illustrate why color deconfines when chiral symmetry is restored in gauge
theories with quarks in the fundamental representation, and while these
transitions do not need to coincide when quarks are in the adjoint
representation, entanglement between them is still present.Comment: 4 pages, 1 figure, proceedings of Quark Matter 200
On finite-temperature holographic QCD in the Veneziano limit
Holographic models in the T=0 universality class of QCD in the limit of large
number N_c of colors and N_f massless fermion flavors, but constant ratio
x_f=N_f/N_c, are analyzed at finite temperature. The models contain a
5-dimensional metric and two scalars, a dilaton sourcing TrF^2 and a tachyon
dual to \bar qq. The phase structure on the T,x_f plane is computed and various
1st order, 2nd order transitions and crossovers with their chiral symmetry
properties are identified. For each x_f, the temperature dependence of p/T^4
and the quark-antiquark -condensate is computed. In the simplest case, we find
that for x_f up to the critical x_c\sim 4 there is a 1st order transition on
which chiral symmetry is broken and the energy density jumps. In the conformal
window x_c<x_f<11/2, there is only a continuous crossover between two conformal
phases. When approaching x_c from below, x_f\to x_c, temperature scales
approach zero as specified by Miransky scaling.Comment: 66 pages, 29 figure
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