Dynamical Electroweak Symmetry Breaking in String Models With D-Branes

Kitazawa, Noriaki

doi:10.1142/s0217751x10048469

Cited by 4 publications

(1 citation statement)

References 96 publications

(111 reference statements)

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“…1 We also work in the weak coupling regime. For an alternate approach, see [32]. 2 The only remnant of the compactification is the relation between the Yang-Mills coupling and the string coupling.…”

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confidence: 99%

Searching for string resonances ine+e−andγγcollisions

et al. 2011

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If the fundamental mass scale of superstring theory is as low as few TeVs, the massive modes of vibrating strings, Regge excitations, will be copiously produced at the Large Hadron Collider (LHC).We discuss the complementary signals of low mass superstrings at the proposed electron-positron facility (CLIC), in e + e − and γγ collisions. We examine all relevant four-particle amplitudes evaluated at the center of mass energies near the mass of lightest Regge excitations and extract the corresponding pole terms. The Regge poles of all four-point amplitudes, in particular the spin content of the resonances, are completely model independent, universal properties of the entire landscape of string compactifications. We show that γγ → e + e − scattering proceeds only through a spin-2 Regge state. We estimate that for this particular channel, string scales as high as 4 TeV can be discovered at the 11σ level with the first fb −1 of data collected at a center-of-mass energy ≈ 5 TeV. We also show that for e + e − annihilation into fermion-antifermion pairs, string theory predicts the precise value, equal 1/3, of the relative weight of spin 2 and spin 1 contributions. This yields a dimuon angular distribution with a pronounced forward-backward asymmetry, which will help distinguishing between low mass strings and other beyond the standard model scenarios.

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confidence: 99%

Searching for string resonances ine+e−andγγcollisions

et al. 2011

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Combined constraints on holographic bosonic technicolor

Carone

Primulando

2010

Phys. Rev. D

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We consider a model of strong electroweak symmetry breaking in which the expectation value of an additional, possibly composite, scalar field is responsible for the generation of fermion masses.The dynamics of the strongly coupled sector is defined and studied via its holographic dual, and does not correspond to a simple, scaled-up version of QCD. We consider the bounds from perturbative unitarity, the S parameter, and the mass of the Higgs-like scalar. We show that the combination of these constraints leaves a relatively limited region of parameter space viable, and suggests the qualitative features of the model that might be probed at the LHC.

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S-parameter, technimesons, and phase transitions in holographic tachyon DBI models

Goykhman

Parnachev

2013

Phys. Rev. D

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We investigate some phenomenological aspects of the holographic models based on the tachyon Dirac-Born-Infeld action in the AdS space-time. These holographic theories model strongly interacting fermions and feature dynamical mass generation and symmetry breaking. We show that they can be viewed as models of holographic walking technicolor and compute the Peskin-Takeuchi S-parameter and masses of lightest technimesons for a variety of the tachyon potentials. We also investigate the phase structure at finite temperature and charge density. Finally, we comment on the holographic Wilsonian RG in the context of holographic tachyon DBI models.

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Dynamical Electroweak Symmetry Breaking in String Models With D-Branes

Cited by 4 publications

References 96 publications

Searching for string resonances ine+e−andγγcollisions

Searching for string resonances ine+e−andγγcollisions

Combined constraints on holographic bosonic technicolor

S-parameter, technimesons, and phase transitions in holographic tachyon DBI models

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