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A Higgslike Dilaton

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arxiv 1209.3299 v2 pith:HBTKZHHY submitted 2012-09-14 hep-ph

Brando Bellazzini , Csaba Csáki , Jay Hubisz , Javi Serra , John Terning This is my paper · ORCID
classification hep-ph
keywords dilatonscaledynamicalmassonlycorrespondslambdaresonance
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We examine the possibility that the recently discovered 125 GeV higgs like resonance actually corresponds to a dilaton: the Goldstone boson of scale invariance spontaneously broken at a scale f. Comparing to LHC data we find that a dilaton can reproduce the observed couplings of the new resonance as long as f ~ v, the weak scale. This corresponds to the dynamical assumption that only operators charged under the electroweak gauge group obtain VEVs. The more difficult task is to keep the mass of the dilaton light compared to the dynamical scale, Lambda ~ 4 pi f, of the theory. In generic, non-supersymmetric theories one would expect the dilaton mass to be similar to Lambda. The mass of the dilaton can only be lowered at the price of some percent level (or worse) tuning and/or additional dynamical assumptions: one needs to suppress the contribution of the condensate to the vacuum energy (which would lead to a large dilaton quartic coupling), and to allow only almost marginal deformations of the CFT.

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Cited by 5 Pith papers

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  4. Dilaton Physics from Asymptotic Freedom

    hep-th 2025-01 conditional novelty 6.0 of 10

    In a large-N 3D Gross-Neveu-Yukawa theory, the endpoint of the conformal window spontaneously breaks scale symmetry, producing a massless dilaton whose decay constant and induced mass obey a universal product formula.

  5. Dilatonic states, phase transitions, and criticality in holography

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    A review of holographic examples indicating that a light dilaton appears near critical endpoints of first-order zero-temperature phase transitions, with explicit but lower-dimensional demonstrations.

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