LHC top partner searches beyond the 2 TeV mass region

Backović, Mihailo; Flacke, Thomas; Lee, Seung Joon; Pérez, Gilad

doi:10.1007/jhep09(2015)022

Cited by 38 publications

(37 citation statements)

References 54 publications

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“…For the signal prediction, we have used an UFO format [43] implementation of the model described 5 A simple way to obtain these BRs is through the equivalence theorem, whose use is justified by the significant mass splitting between top partners and SM states, mΨ m W,Z,h . These BRs could however significantly deviate from the above pattern in the presence of additional light fermionic resonances [36,37]. 6 For gρ = 2, VBF accounts for O(1%) or less of the total cross section.…”

Section: Recast Of the Cms Ss2 Analysismentioning

confidence: 89%

Bounding wide composite vector resonances at the LHC

Barducci

Delaunay

2016

J. High Energ. Phys.

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Abstract:In composite Higgs models (CHMs), electroweak precision data generically push colourless composite vector resonances to a regime where they dominantly decay into pairs of light top partners. This greatly attenuates their traces in canonical collider searches, tailored for narrow resonances promptly decaying into Standard Model final states. By reinterpreting the CMS same-sign dilepton (SS2 ) analysis at the Large Hadron Collider (LHC), originally designed to search for top partners with electric charge 5/3, we demonstrate its significant coverage over this kinematical regime. We also show the reach of the 13 TeV run of the LHC, with various integrated luminosity options, for a possible upgrade of the SS2 search. The top sector of CHMs is found to be more fine-tuned in the presence of colourless composite resonances in the few TeV range.

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Section: Recast Of the Cms Ss2 Analysismentioning

confidence: 89%

Bounding wide composite vector resonances at the LHC

Barducci

Delaunay

2016

J. High Energ. Phys.

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“…In these proceedings we refrain from giving the full Lagrangian and interactions used for our simulations and model implementations (they can be found in Refs. [10,11]) and instead summarize the qualitative features relevant for LHC searches:…”

Section: A Sample Model: the Minimal Composite Higgs Modelmentioning

confidence: 99%

Search strategies for vector-like quark partners at LHC run-II

Flacke

2017

EPJ Web Conf.

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Abstract. We present results on several new search channels and strategies for heavy vector-like quark partners or vector resonances at the LHC run-II. Run-II has sensitivity to single-and pair-produced quark partners with masses beyond 1 TeV, and for even higher masses for vector resonances. Decays of such heavy particles yield highly boosted tops, Higgses, and weak gauge bosons. At high boost, the Standard Model background of hadronic final states can be substantially suppressed when applying jet-substructure techniques. We present several case studies where the identification of hadronically decaying tops, Higgses, and/or electroweak gauge bosons allow to make new search channels competitive at run-II. Motivation and OverviewNaturalness has for a long time been a guiding principle of theoretical particle physics. While the discovery of the last missing Standard Model SM particle -the Higgs -marks a great success of particle physics, it is difficult to understand why the Higgs mass is so much smaller than the Planck mass. Composite Higgs models provide a possible solution to this hierarchy problem [1,2]. The main idea behind composite Higgs models is to realize the Higgs multilplet as a light bound state of a theory which becomes strongly coupled below a scale of a few TeV. The large hierarchy between the TeV scale and the Planck scale is realized through dimensional transmutation. If the Higgs multiplet is realized as a pseudo-Nambu-Goldstone boson (pNGB) multiplet of a global symmetry of the underlying model, a small hierarchy between the Higgs mass m h , the electroweak scale v and the decay constant f of the pNGB can be realized at the price of a mild fine-tuning. From a low-energy perspective, the most minimal implementation of the composite Higgs paradigm is realized in models with S O(5) → S O(4) breaking [3]. Within such effective field theory descriptions, indirect bounds like deviations of Higgs couplings from the Standard Model (SM) prediction and electroweak precision tests yield constraints of f 500−1000 GeV, depending on the precise model, the top-partner masses, and the underlying UV dynamics. Flavour physics also yields important constraints, as obtaining the observed top mass requires an extended (top-)quark sector with additional sources for flavor changing neutral currents. Partial compositeness of the top can successfully address these flavor problems as recently discussed in [4].On the other hand, composite Higgs models can be tested directly by searching for composite resonances beyond the Higgs. Composite top-partners, scalar-or vector resonances are expected to

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“…2 While we considered only the same-sign di-lepton channel in our analysis, there are also other channels (e.g., final state with top quarks decaying hadronically) which can be potentially important [38,39].…”

Section: The Model Setupmentioning

confidence: 99%

Same sign di-lepton candles of the composite gluons

Azatov

Chowdhury

Ray

et al. 2015

J. High Energ. Phys.

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Composite Higgs models, where the Higgs boson is identified with the pseudo-Nambu-Goldstone-Boson (pNGB) of a strong sector, typically have light composite fermions (top partners) to account for a light Higgs. This type of models, generically also predicts the existence of heavy vector fields (composite gluons) which appear as an octet of QCD. These composite gluons become very broad resonances once phase-space allows them to decay into two composite fermions. This makes their traditional experimental searches, which are designed to look for narrow resonances, quite ineffective. In this paper, we as an alternative, propose to utilize the impact of composite gluons on the production of top partners to constrain their parameter space. We place constraints on the parameters of the composite resonances using the 8 TeV LHC data and also assess the reach of the 14 TeV LHC. We find that the high luminosity LHC will be able to probe composite gluon masses up to ∼ 6 TeV, even in the broad resonance regime.

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LHC top partner searches beyond the 2 TeV mass region

Cited by 38 publications

References 54 publications

Bounding wide composite vector resonances at the LHC

Bounding wide composite vector resonances at the LHC

Search strategies for vector-like quark partners at LHC run-II

Same sign di-lepton candles of the composite gluons

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