Spectrum-doubled heavy vector bosons at the LHC

Appelquist, Thomas; Bai, Y.; Ingoldby, James; Piai, Maurizio

doi:10.1007/jhep01(2016)109

Cited by 5 publications

(5 citation statements)

References 68 publications

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“…It has been suggested that, if this quartet are bound states of fermions with a new strong interaction, being close to this critical situation gives rise to nearly degenerate isovectors that are ρ-like and a 1 -like resonances and that decay, respectively and almost exclusively, to pairs of longitudinally polarized EW bosons and to a longitudinal EW boson plus the 125 GeV Higgs boson; see Refs. [28,29,30] for details. We speculate that, once the scale symmetry is explicitly broken by quantum corrections, the massive but light Higgs and the longitudinal weak bosons remain close enough to the critical point that the diboson resonances likely carry this imprint of their origin.…”

Section: The Lee-pilaftsis Modelmentioning

confidence: 99%

Natural stabilization of the Higgs boson’s mass and alignment

Lane

Shepherd

2019

Phys. Rev. D

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Current data from the LHC indicate that the 125 GeV Higgs boson, H, is either the single Higgs of the Standard Model or, to a good approximation, an "aligned Higgs". We propose that H is the pseudo-Goldstone dilaton of Gildener and Weinberg. Models based on their mechanism of scale symmetry breaking can naturally account for the Higgs boson's low mass and aligned couplings. We conjecture that they are the only way to achieve a "Higgslike dilaton" that is actually the Higgs boson. These models further imply the existence of additional Higgs bosons in the vicinity of 200 to about 550 GeV. We illustrate our proposal in a version of the two-Higgs-doublet model of Lee and Pilaftsis. Our version of this model is consistent with published precision electroweak and collider physics data. We describe tests to confirm, or exclude, this model at Run 3 of the LHC. * lane@bu.edu † shepherd@shsu.edu arXiv:1808.07927v2 [hep-ph] 15 Dec 2018 1 We follow GW in assuming that all gauge boson and fermion masses are due to their couplings to Higgs bosons.2 Bardeen has argued that the classical scale invariance of the SM Lagrangian with the Higgs mass term set to zero eliminates the quadratic divergences in Higgs mass renormalization [16]. That appears not to be correct. In any case, as far as we know, no one has yet proposed a plausible dynamics that produces a scale-invariant SM potential or the more general V 0 (Φ) in Eqs. (3) and (13) below. Obviously, doing that would be a great advance. 3 We assume that the f ijkl satisfy positivity conditions guaranteeing that V 0 has only finite minima. Hermiticity of V 0 also constrains these couplings.

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Section: The Lee-pilaftsis Modelmentioning

confidence: 99%

Natural stabilization of the Higgs boson’s mass and alignment

Lane

Shepherd

2019

Phys. Rev. D

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“…The decay rates Γ(ρ H → V V ) and Γ(a H → V H) are nearly identical because, as explained above, M ρ H ∼ = M a H and (H, V L ) are an approximately degenerate (2, 2) quartet in the Wigner-Weyl mode of the symmetry [53]. In Eq.…”

Section: Masses Of the Spin-one Technihadronsmentioning

confidence: 78%

“…(1.2), is tuned to be close to the EW phase transition, we expect that ρ H and a H are nearly parity-doubled triplets with M ρ H ∼ = M a H . Thus, they can be adequately described as the gauge bosons of a hidden local symmetry (HLS) [49], SU (2) L ⊗ SU (2) R , with equal gauge couplings g L = g R ≡ g ρ H [50][51][52][53]. This coupling is analogous to g ρππ and is expected to be large, g ρ H 3-5.…”

Section: Masses Of the Spin-one Technihadronsmentioning

confidence: 99%

The light composite Higgs boson in strong extended technicolor

Lane

Pritchett

2017

J. High Energ. Phys.

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This paper extends an earlier one describing the Higgs boson H as a light composite scalar in a strong extended technicolor model of electroweak symmetry breaking. The Higgs mass M H is made much smaller than Λ ETC by tuning the ETC coupling very close to the critical value for electroweak symmetry breaking. The technicolor interaction, neglected in the earlier paper, is considered here. Its weakness relative to extended technicolor is essential to understanding the lightness of H compared to the low-lying spin-one technihadrons. Technicolor cannot be completely ignored, but implementing technigluon exchange together with strong extended technicolor appears difficult. We propose a solution that turns out to leave the results of the earlier paper essentially unchanged. An argument is then presented that masses of the spin-one technifermion bound states, ρ H and a H , are much larger than M H and, plausibly, controlled by technicolor. Assuming M ρ H and M a H are in the TeV-energy region, we identify ρ H and a H with the diboson excesses observed near 2 TeV by ATLAS and CMS in LHC Run 1 data, and we discuss their phenomenology for Runs 2 and 3.

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“…Very recently, the authors of Ref. [116] have considered a model with symmetry group [SU (2)] 4 × U (1) B−L , which preserves not only left-right symmetry, but also custodial symmetry. This effective theory is mainly motivated by strongly interacting models, but can also represent a weakly interacting extended gauge sector.…”

Section: Other Models With Extended Gauge Groupsmentioning

confidence: 99%

“…In strong-dynamics models, the near degeneracy of ρ and a implied by the parity symmetry minimizes the contribution of the strong dynamics to the S-parameter [132,133]. The parity also forbids ρ → V L H and a → V L V L up to small electroweak corrections [116].…”

Section: Resonance Production and Decay Modesmentioning

confidence: 99%

The Diboson Excess: Experimental Situation and Classification of Explanations; A Les Houches Pre-Proceeding

Brehmer¹,

Brooijmans²,

Cacciapaglia³

et al. 2015

Preprint

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We examine the 'diboson' excess at ∼ 2 TeV seen by the LHC experiments in various channels. We provide a comparison of the excess significances as a function of the mass of the tentative resonance and give the signal cross sections needed to explain the excesses. We also present a survey of available theoretical explanations of the resonance, classified in three main approaches. Beyond that, we discuss methods to verify the anomaly, determining the major properties of the various surpluses and exploring how different models can be discriminated. Finally, we give a tabular summary of the numerous explanations, presenting their main phenomenological features.

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Spectrum-doubled heavy vector bosons at the LHC

Cited by 5 publications

References 68 publications

Natural stabilization of the Higgs boson’s mass and alignment

Natural stabilization of the Higgs boson’s mass and alignment

The light composite Higgs boson in strong extended technicolor

The Diboson Excess: Experimental Situation and Classification of Explanations; A Les Houches Pre-Proceeding

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