Minimal composite Higgs model with light bosons

Dobrescu, Bogdan A.

doi:10.1103/physrevd.63.015004

Cited by 49 publications

(58 citation statements)

References 47 publications

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“…[29,30]. In our model, the additional U(3) L breaking effects (besides the tadpole terms) come from the SU(2) W ×U(1) Y gauge interactions.…”

Section: Jhep08(2014)095 3 U(3) L Breaking From Electroweak Interactionsmentioning

confidence: 99%

“…The heavy top given by top condensation mixes with a massive vector-like top partner, resulting in a light mass eigenstate of m t ≈ 173 GeV, identified as the observed top quark. Although the composite Higgs boson is likely to be heavier than the weak scale, for some range of parameters it is possible to obtain a relatively light Higgs boson [29,30,32,33]. Generically, the composite Higgs sector includes two doublets and two singlets [30], and a light Higgs boson could arise due to the mixing among the four CP-even scalars.…”

Section: Jhep08(2014)095mentioning

confidence: 99%

“…This theory does not include a Higgs doublet nor any elementary scalars. We assume that some of the 4-fermion interactions involving third generation quarks and χ are attractive and sufficiently strong to form quark-antiquark bound states [30]. These strong interactions are not confining, because at distances longer than 1/Λ the effects of 4-fermion interactions (other than the presence of bound states) are exponentially suppressed.…”

Section: Composite Higgsmentioning

confidence: 99%

“…An attractive solution to the top mass problem in top-condensation models is through the top-seesaw mechanism [28][29][30][31]. The heavy top given by top condensation mixes with a massive vector-like top partner, resulting in a light mass eigenstate of m t ≈ 173 GeV, identified as the observed top quark.…”

Section: Jhep08(2014)095mentioning

confidence: 99%

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Higgs mass from compositeness at a multi-TeV scale

Cheng

Dobrescu

2014

J. High Energ. Phys.

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Within composite Higgs models based on the top seesaw mechanism, we show that the Higgs field can arise as the pseudo Nambu-Goldstone boson of the broken U(3) L chiral symmetry associated with a vector-like quark and the t-b doublet. As a result, the lightest CP-even neutral state of the composite scalar sector is lighter than the top quark, and can be identified as the newly discovered Higgs boson. Constraints on weak-isospin violation push the chiral symmetry breaking scale above a few TeV, implying that other composite scalars are probably too heavy to be probed at the LHC, but may be within reach at a future hadron collider with center-of-mass energy of about 100 TeV.

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“…[29,30]. In our model, the additional U(3) L breaking effects (besides the tadpole terms) come from the SU(2) W ×U(1) Y gauge interactions.…”

Section: Jhep08(2014)095 3 U(3) L Breaking From Electroweak Interactionsmentioning

confidence: 99%

Section: Jhep08(2014)095mentioning

confidence: 99%

Section: Composite Higgsmentioning

confidence: 99%

Section: Jhep08(2014)095mentioning

confidence: 99%

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Higgs mass from compositeness at a multi-TeV scale

Cheng

Dobrescu

2014

J. High Energ. Phys.

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“…This Higgs mass prediction has clearly large theoretical uncertainties due to the non-perturbative interactions involved in compositeness, but the large Higgs selfcoupling appears to be a rather generic consequence of the strongly-coupled binding interaction. It is possible though that there exist several composite Higgs fields [14], in which case the mixing among the various CP-even Higgs bosons may allow the lightest one to have standard-model-like couplings and a mass close to the current LEP II bound [17].…”

Section: Top Quark Seesaw-theorymentioning

confidence: 99%

Unscrambling new models for higher-energy physics

Dobrescu¹

2001

AIP Conference Proceedings

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Abstract. There is strong evidence that new physical degrees of freedom and new phenomena exist and may be revealed in future collider experiments. The best hints of what this new physics might be are provided by electroweak symmetry breaking. I briefly review certain theories for physics beyond the standard model, including the top-quark seesaw model and universal extra dimensions. A common feature of these models is the presence of vector-like quarks at the TeV scale. Then I discuss the role of a linear e + e − collider in disentangling this new physics. THE CASE FOR NEW PHYSICSThe observed fundamental particles, namely the SU(3) C × SU(2) W × U(1) Y gauge bosons, the longitudinal degrees of freedom of the W ± and Z 0 , and three generations of quarks and leptons, may explain in principle all observed physical phenomena. However, there is strong evidence for the existence of new phenomena at higher energy scales than the ones probed so far. The most robust argument is provided by the perturbative violation of unitarity in the W W scattering, at a scale of order 1 TeV [1]. Therefore, either the W and Z have strongly coupled selfinteractions at the TeV scale, or new fundamental degrees of freedom exist. The scale of these new phenomena is within the reach of future collider experiments, and exploring them is at the heart of high-energy physics.The standard model accomodates rather well all available data, especially when the Higgs boson is light [2]. More generally, any model with a decoupling limit [3] given by the standard model is viable, at least in that limit. These are models in 1) Plenary talk at the 5th International Linear Collider Workshop (LCWS 2000), Fermilab, October 24-28, 2000

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Shedding light on top partner at the LHC

Alhazmi

Kim

Kong

et al. 2019

J. High Energ. Phys.

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We investigate the sensitivity of the 14 TeV LHC to pair-produced top partners (T ) decaying into the Standard Model top quark (t) plus either a gluon (g) or a photon (γ). The decays T → tg and T → tγ can be dominant when the mixing between the top partner and top quark are negligible. In this case, the conventional decays T → bW , T → tZ, and T → th are highly suppressed and can be neglected. We take a model-independent approach using effective operators for the T -t-g and T -t-γ interactions, considering both spin-1 2 and spin-3 2 top partners. We perform a semirealistic simulation with boosted top quark tagging and an appropriate implementation of a jet-faking-photon rate. Despite a simple dimensional analysis indicating that the branching ratios BR(T → tγ) BR(T → tg) due to the electric-magnetic coupling being much smaller than the strong force coupling, our study shows that the LHC sensitivity to TT → ttγg is more significant than the sensitivity to T T → ttgg. This is due to much smaller backgrounds attributed to the isolated high-p T photon. We find that with these decay channels and 3 ab −1 of data, the LHC is sensitive to top partner masses m T 1.4 − 1.8 TeV for spin-1 2 and spin-3 2 top partners, respectively.

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Minimal composite Higgs model with light bosons

Cited by 49 publications

References 47 publications

Higgs mass from compositeness at a multi-TeV scale

Higgs mass from compositeness at a multi-TeV scale

Unscrambling new models for higher-energy physics

Shedding light on top partner at the LHC

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