scholarly journals Light composite Higgs boson from higher representations versus electroweak precision measurements: Predictions for CERN LHC

2005 ◽  
Vol 72 (5) ◽  
Author(s):  
Dennis D. Dietrich ◽  
Francesco Sannino ◽  
Kimmo Tuominen
Keyword(s):  
Higgs Boson ◽  
Precision Measurements ◽  
Composite Higgs ◽  
Electroweak Precision

STRONGLY INTERACTING ELECTROWEAK THEORIES AND THEIR FIVE-DIMENSIONAL ANALOGS AT THE LHC

2009 ◽  
Vol 24 (01) ◽  
pp. 61-80
Author(s):  
ALEX POMAROL
Keyword(s):  
Higgs Boson ◽  
Hadron Collider ◽  
Field Theories ◽  
Hierarchy Problem ◽  
Strongly Coupled ◽  
Composite Higgs ◽  
Strongly Interacting ◽  
Coupled Field ◽  
Electroweak Precision ◽  
Elegant Solution

Strongly interacting theories of electroweak (EW) symmetry breaking provide an elegant solution to the hierarchy problem. In these models the EW symmetry can either be broken without a Higgs or by means of a composite Higgs boson. These scenarios have been recently investigated in the framework of five-dimensional warped models that, according to the AdS/CFT correspondence, have a four-dimensional holographic interpretation in terms of strongly coupled field theories. We describe the minimal Higgsless and composite Higgs model and show how they can successfully pass all the electroweak precision tests and solve the flavor problems. We explore the implications of these models at the LHC (Large Hadron Collider).

scholarly journals A 125 GeV composite Higgs boson versus flavour and electroweak precision tests

2013 ◽  
Vol 2013 (5) ◽  
Author(s):  
Riccardo Barbieri ◽  
Dario Buttazzo ◽  
Filippo Sala ◽  
David M. Straub ◽  
Andrea Tesi
Keyword(s):  
Higgs Boson ◽  
Composite Higgs ◽  
Electroweak Precision

scholarly journals LIGHT COMPOSITE HIGGS: LCH @ LHC

2005 ◽  
Vol 20 (27) ◽  
pp. 6133-6148 ◽  
Author(s):  
FRANCESCO SANNINO
Keyword(s):  
Gauge Group ◽  
Higgs Mass ◽  
Cold Dark Matter ◽  
Precision Measurements ◽  
Chiral Phase ◽  
Symmetric Representation ◽  
Composite Higgs ◽  
Higher Dimensional ◽  
The One ◽  
Intrinsic Scale

Here I summarize some of the salient features of technicolor theories with technifermions in higher dimensional representations of the technicolor gauge group. The expected phase diagram as function of number of flavors and colors for the two index (anti)symmetric representation of the gauge group is reviewed. After having constructed the simplest walking technicolor theory one can show that it is not at odds with the precision measurements. The simplest theory also requires, for consistency, a fourth family of heavy leptons. The latter may result in an interesting signature at LHC. In the case of a fourth family of leptons with ordinary lepton hypercharge the new heavy neutrino can be a natural candidate of cold dark matter. New theories will also be proposed in which the critical number of flavors needed to enter the conformal window is higher than in the one with fermions in the two-index symmetric representation, but lower than in the walking technicolor theories with fermions only in the fundamental representation of the gauge group. Due to the near conformal/chiral phase transition the composite Higgs is very light compared to the intrinsic scale of the technicolor theory. For the two technicolor theory the composite Higgs mass is predicted not to exceed 150 GeV.

scholarly journals On the nature of the Higgs boson

2019 ◽  
Vol 34 (16) ◽  
pp. 1950123 ◽  
Author(s):  
Damiano Anselmi
Keyword(s):  
Higgs Boson ◽  
Crucial Role ◽  
Precision Measurements ◽  
Radiative Corrections ◽  
True Nature ◽  
Decay Products ◽  
The One

Several particles are not observed directly, but only through their decay products. We consider the possibility that they might be fakeons, i.e. fake particles, which mediate interactions but are not asymptotic states. A crucial role to determine the true nature of a particle is played by the imaginary parts of the one-loop radiative corrections, which are affected in nontrivial ways by the presence of fakeons in the loop. The knowledge we have today is sufficient to prove that most non-directly observed particles are true physical particles. However, in the case of the Higgs boson the possibility that it might be a fakeon remains open. The issue can be resolved by means of precision measurements in existing and future accelerators.

scholarly journals Z′ and Higgs Boson Production Associated with a Top Quark Pair as a Probe of the U(1)B-L Model at e+e- Colliders

2018 ◽  
Vol 2018 ◽  
pp. 1-16 ◽  
Author(s):  
F. Ramírez-Sánhez ◽  
A. Gutiérrez-Rodríguez ◽  
Alejandro González-Sánchez ◽  
M. A. Hernández-Ruíz
Keyword(s):  
Higgs Boson ◽  
Cross Section ◽  
Top Quark ◽  
Higgs Bosons ◽  
Precision Measurements ◽  
Boson Production ◽  
Resonance Effects ◽  
Linear Colliders ◽  
Analytical Formulas ◽  
Near Future

We study the production sensitivity of Higgs bosons h and H, in relation to the possible existence of Z′ boson and a top quark pair at the energy scales that will be reached in the near future at projected e+e- linear colliders. We focus on the resonance and no-resonance effects of the annihilation processes e+e-→(γ,Z,Z′)→tt-h and e+e-→(γ,Z,Z′)→tt-H. Furthermore, we develop and present novel analytical formulas to assess the total cross section involved in the production of Higgs bosons. We find that the possibility of performing precision measurements for the Higgs bosons h and H and for the Z′ boson is very promising at future e+e- linear colliders.

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