Common exotic decays of top partners

Bizot, Nicolas; Cacciapaglia, Giacomo; Flacke, Thomas

doi:10.1007/jhep06(2018)065

Cited by 72 publications

(66 citation statements)

References 71 publications

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“…Particular attention has been devoted to models and dynamical theories characterised by the SU (4)/Sp(4) coset (see for instance Refs. [40][41][42][43][44][45][46][47][48][49][50][51][52][53][54][55][56][57][58][59]). The low-energy EFT Lagrangian contains, in this case, five scalar fields, that describe the long-distance dynamics of the five pNGBs.…”

Section: Introductionmentioning

confidence: 99%

Sp (4) gauge theories on the lattice: Nf = 2 dynamical fundamental fermions

Bennett

Hong

Lee

et al. 2019

J. High Energ. Phys.

135

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We perform lattice studies of the gauge theory with Sp(4) gauge group and two flavours of (Dirac) fundamental matter. The global SU (4) symmetry is spontaneously broken by the fermion condensate. The dynamical Wilson fermions in the lattice action introduce a mass that breaks the global symmetry also explicitly. The resulting pseudo-Nambu-Goldstone bosons describe the SU (4)/Sp(4) coset, and are relevant, in the context of physics beyond the Standard Model, for composite Higgs models. We discuss scale setting, continuum extrapolation and finite volume effects in the lattice theory. We study mesonic composite states, which span representations of the unbroken Sp(4) global symmetry, and we measure masses and decay constants of the (flavoured) spin-0 and spin-1 states accessible to the numerical treatment, as a function of the fermion mass. With help from the effective field theory treatment of such mesons, we perform a first extrapolation towards the massless limit. We assess our results by critically comparing to the literature on other models and to the quenched results, and we conclude by outlining future avenues for further exploration. The results of our spectroscopic analysis provide new input data for future phenomenological studies in the contexts of composite Higgs models, and of dark matter models with a strongly coupled dynamical origin. arXiv:1909.12662v2 [hep-lat] 22 Nov 2019 7 Comparison to other gauge theories 37 8 Continuum results: summary 42 9 Conclusions and outlook 43 A Lattice action and numerical calculations: additional details 45 A.1 Hybrid Monte Carlo 45 A.2 Of diquarks 47 A.3 Effective mass and fitting procedure 48 B Low-energy constants and global fit 50 -1 -

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Section: Introductionmentioning

confidence: 99%

Sp (4) gauge theories on the lattice: Nf = 2 dynamical fundamental fermions

Bennett

Hong

Lee

et al. 2019

J. High Energ. Phys.

135

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“…Non-standard VLQ top and bottom partner decays into a singlet scalar field like those in Eq. (2) have already been explored in the literature [55][56][57][58][59] (see also [60,61]). These studies mainly consider the singlet scalar σ being invisible at colliders [55,56,62], or decaying into Zγ, γγ final states [58], yet not focusing on the singlet scalar decays from Eq.…”

Section: Introductionmentioning

confidence: 99%

Exotic vectorlike quark phenomenology in the minimal linear σ model

et al. 2020

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Extensions of the Standard Model that include vector-like quarks commonly also include additional particles that may mediate new production or decay modes. Using as example the minimal linear σ model, that reduces to the minimal SO(5)/SO(4) composite Higgs model in a specific limit, we consider the phenomenology of vector-like quarks when a scalar singlet σ is present. This new particle may be produced in the decays T → tσ, B → bσ, where T and B are vector-like quarks of charges 2/3 and −1/3, respectively, with subsequent decay σ → W + W − , ZZ, hh. By scanning over the allowed parameter space we find that these decays may be dominant. In addition, we find that the presence of several new particles allows for single T production cross sections larger than those expected in minimal models. We discuss the observability of these new signatures in existing searches.

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“…In Ref. [30] a first survey of exotic top partner decays that commonly occur in underlying models has been presented. These include the following new decay channels for X 5/3 : 1.…”

Section: Introductionmentioning

confidence: 99%

Exotic decays of top partners with charge 5/3: bounds and opportunities

Xie

Cacciapaglia

Flacke

2019

J. High Energ. Phys.

Self Cite

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Exotic decays of top partners in new bosons are the norm in realistic models of a composite Higgs. We focus on the custodial charge-5/3 partner, which normally decays exclusively into tW + . The new channels include a colour-sextet, X 5/3 →bπ 6 , as well as singly and doubly charged scalars, X 5/3 → tφ + , bφ ++ . We use existing same-sign lepton searches to show that the new final states are constrained at the same level as the standard one. At the same time, exotic final states also offer opportunities for improvement: examples include a hard photon in X 5/3 → tφ + → tW + γ decays, and top-rich channels which arise in several exotic X 5/3 decays. arXiv:1907.05894v1 [hep-ph]

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Common exotic decays of top partners

Cited by 72 publications

References 71 publications

Sp (4) gauge theories on the lattice: Nf = 2 dynamical fundamental fermions

Sp (4) gauge theories on the lattice: Nf = 2 dynamical fundamental fermions

Exotic vectorlike quark phenomenology in the minimal linear σ model

Exotic decays of top partners with charge 5/3: bounds and opportunities

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