A light scalar from walking solutions in gauge-string duality

Elander, Daniel; Núñez, Carlos; Piai, Maurizio

doi:10.1016/j.physletb.2010.02.023

Cited by 83 publications

(143 citation statements)

References 18 publications

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“…A precise ladder evaluation of m φ F φ based on this PCDC relation reads [12]: (m φ F φ ) 2 More recently, in another approach using holographic WTC [15] it was shown [11] that the strong gluon dynamics via the large technigluon condensate can realize a parametrically massless TD limit m φ /v EW → 0+ and hence naturally realize m φ ≃ v EW /2 ≃ 125 GeV, consistent with the LHC Higgs data. Similar arguments for realizing a parametrically light dilaton were given in somewhat different contexts [16].…”

Section: Introductionmentioning

confidence: 58%

Discovering walking technirho mesons at the LHC

2014

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We formulate a scale-invariant hidden local symmetry (HLS) as a low-energy effective theory of the walking technicolor (WTC) which includes the technidilaton, technipions, and technirho mesons as the low-lying spectra. As a benchmark for LHC phenomenology, we in particular focus on the one-family model of WTC having eight technifermion flavors, which can be at energy scales relevant to the reach of the LHC described by the scale-invariant HLS based on the manifold [SU (8)L × SU (8)R] global × SU (8) local /SU (8)V , where SU (8) local is the HLS and the global SU (8)L × SU (8)R symmetry is partially gauged by SU (3) × SU (2)L × U (1)Y of the standard model. Based on the scale-invariant HLS, we evaluate the coupling properties of the technirho mesons and place limits on the masses from the current LHC data. Then, implications for future LHC phenomenology are discussed by focusing on the technirho mesons produced through the Drell-Yan process. We find that the color-octet technirho decaying to the technidilaton along with the gluon is of interest as the discovery channel at the LHC, which would provide a characteristic signature to probe the one-family WTC.

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Section: Introductionmentioning

confidence: 58%

Discovering walking technirho mesons at the LHC

2014

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“…spectra include an anomalously light state [72][73][74][75]. For instance, the Witten model has many properties that make it resemble the gravity dual of a non-supersymmetric Yang-Mills theory, and the gravity calculation yields R ≃ 1.7 [67].…”

Section: Jhep06(2016)114mentioning

confidence: 99%

Large mass hierarchies from strongly-coupled dynamics

Athenodorou

Bennett

Bergner

et al. 2016

J. High Energ. Phys.

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Besides the Higgs particle discovered in 2012, with mass 125 GeV, recent LHC data show tentative signals for new resonances in diboson as well as diphoton searches at high center-of-mass energies (2 TeV and 750 GeV, respectively). If these signals are confirmed (or other new resonances are discovered at the TeV scale), the large hierarchies between masses of new bosons require a dynamical explanation. Motivated by these tentative signals of new physics, we investigate the theoretical possibility that large hierarchies in the masses of glueballs could arise dynamically in new strongly-coupled gauge theories extending the standard model of particle physics. We study lattice data on non-Abelian gauge theories in the (near-)conformal regime as well as a simple toy model in the context of gauge/gravity dualities. We focus our attention on the ratio R between the mass of the lightest spin-2 and spin-0 resonances, that for technical reasons is a particularly convenient and clean observable to study. For models in which (non-perturbative) large anomalous dimensions arise dynamically, we show indications that this mass ratio can be large, with R > 5. Moreover, our results suggest that R might be related to universal properties of the IR fixed point. Our findings provide an interesting step towards understanding large mass ratios in the non-perturbative regime of quantum field theories with (near) IR conformal behaviour.

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“…In one such class, an anomalously light scalar composite state has been identified [102,103]. However,…”

Section: Jhep05(2014)003mentioning

confidence: 99%

“…It would be satisfactory to find a model where the lightness of the scalar state has a natural dynamical explanation, rather than being the result of fine-tuning. We conclude by reminding the reader that in the special case studied in [102,103], a light state is JHEP05(2014)003 present in regions of the parameter space of the strongly-coupled theory, without having implemented any fine tuning with the boundary conditions (λ U → −∞ in those calculations).…”

Section: Jhep05(2014)003mentioning

confidence: 99%

Multiscale confining dynamics from holographic RG flows

Elander

Faedo

Hoyos

et al. 2014

J. High Energ. Phys.

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108

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We consider renormalization group flows between conformal field theories in five (six) dimensions with a string (M-theory) dual. By compactifying on a circle (torus) with appropriate boundary conditions, we obtain continuous families of confining fourdimensional theories parametrized by the ratio Λ flow /Λ QCD , with Λ flow the scale at which the flow between fixed points takes place and Λ QCD the confinement scale. We construct the dual geometries explicitly and compute the spectrum of scalar bound states (glueballs). We find a 'universal' subset of states common to all the models. We comment on the modifications of these models, and the corresponding fine-tuning, required for a parametrically light 'dilaton' state to be present. We also comment on some aspects of these theories as probed by extended objects such as strings and branes.

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A light scalar from walking solutions in gauge-string duality

Cited by 83 publications

References 18 publications

Discovering walking technirho mesons at the LHC

Discovering walking technirho mesons at the LHC

Large mass hierarchies from strongly-coupled dynamics

Multiscale confining dynamics from holographic RG flows

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