Six top messages of new physics at the LHC

Han, H.; Huang, Li; Ma, T.; Shu, Jing; Tait, Tim M. P.; Wu, Y.

doi:10.1007/jhep10(2019)008

Cited by 27 publications

(30 citation statements)

References 56 publications

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“…Nevertheless, the projections for HL-LHC are substantially weaker than those of the dedicated search suggested in Ref. [37], which is tailored to the 6 top final state.…”

Section: Acknowledgmentsmentioning

confidence: 66%

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

Xie

Cacciapaglia

Flacke

2019

J. High Energ. Phys.

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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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“…Nevertheless, the projections for HL-LHC are substantially weaker than those of the dedicated search suggested in Ref. [37], which is tailored to the 6 top final state.…”

Section: Acknowledgmentsmentioning

confidence: 66%

“…In particular, this statement holds for charge 2/3 top partners, T 2/3 , that can decay to 3 tops, ttt, via a bosonic mediator [30]. This case has already been considered via vectors [36] and scalars [37], but with older data. Thus, as a byproduct of our X 5/3 study, we will apply our recast search to this final state.…”

mentioning

confidence: 97%

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

Xie

Cacciapaglia

Flacke

2019

J. High Energ. Phys.

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“…The presence of a affects the searches by providing an additional decay channel, T → t a, with the signatures depending on the decay modes of a. The cases of decays into tt and into a pair of electroweak gauge bosons have been studied in Refs [18,19,27], showing a good coverage from current searches and prospects for improvements. In this letter we will focus on the more challenging decays a → gg and a → bb, which dominate at low mass.…”

Section: Phenomenology Of a Top Partner In Presence Of T → T A Decaysmentioning

confidence: 99%

“…Recently there has been raising interest in exploring "exotic" decays into non-SM bosons: they could arise as new pseudo-Nambu-Goldstones in non-minimal cosets [16][17][18][19], as additional pseudo-scalars carrying QCD colour charge [17], as Dark Matter candidates [20,21], or they could be a gluon or a photon [22,23] or simply new scalar states [19,[24][25][26]. Exotic decays of a charge 5/3 top partner have been extensively studied in Ref.…”

mentioning

confidence: 99%

Exotic decays of top partners: Mind the search gap

et al. 2019

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Many standard model extensions, including composite Goldstone Higgs models, predict vectorlike fermionic top-partners at the TeV scale. The intensive search programmes by ATLAS and CMS focus on decays into a 3 rd generation quark and an electroweak boson (W, Z, h). However, underlying models of partial compositeness contain additional states that give rise to exotic top partner decays. We consider a well-motivated scenario in which a charge-2/3 top-partner decays into a pseudo-scalar, T → t a, with a → gg or bb dominating below the tt threshold. We show that the constraints on the top partner mass from QCD pair production are substantially weakened, still allowing a top partner mass as light as 400 GeV.

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“…It is thus important to ask how the presence of exotic decay channels of VLQs can affect the current bounds and whether these might actually be promising discovery channels on their own. This question has been asked in similar contexts in various preceding works [14][15][16][17][18][19][20][21][22][23], each concentrating on a specific BSM construction. Here, in contrast, we follow the approach of [24], which adopts a set of simplified scenarios based on effective Lagrangians (motivated by compositeness).…”

Section: Introductionmentioning

confidence: 99%

Signatures of vector-like top partners decaying into new neutral scalar or pseudoscalar bosons

Benbrik

Kuutmann

Franzosi

et al. 2020

J. High Energ. Phys.

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We explore the phenomenology of models containing one Vector-Like Quark (VLQ), t , which can decay into the Standard Model (SM) top quark, t, and a new spin-0 neutral boson, S, the latter being either a scalar or pseudoscalar state. We parametrise the underlying interactions in terms of a simplified model which enables us to capture possible Beyond the SM (BSM) scenarios. We discuss in particular three such scenarios: one where the SM state is supplemented by an additional scalar, one which builds upon a 2-Higgs Doublet Model (2HDM) framework and another which realises a Composite Higgs Model (CHM) through partial compositeness. Such exotic decays of the t can be competitive with decays into SM particles, leading to new possible discovery channels at the Large Hadron Collider (LHC). Assuming t pair production via strong interactions, we design signal regions optimised for one t → S t transition (while being inclusive on the othert decay, and vice versa), followed by the decay of S into the two very clean experimental signatures S → γ γ and S → Z(→ + −)γ. We perform a dedicated signalto-background analysis in both channels, by using Monte Carlo (MC) event simulations modelling the dynamics from the proton-proton to the detector level. Under the assumption of BR(t → S t) = 100%, we are therefore able to realistically quantify the sensitivity of the LHC to both the t and S masses, assuming both current and foreseen luminosities. This approach paves the way for the LHC experiments to surpass current VLQ search strategies based solely on t decays into SM bosons (W ± , Z, h).

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Six top messages of new physics at the LHC

Cited by 27 publications

References 56 publications

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

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

Exotic decays of top partners: Mind the search gap

Signatures of vector-like top partners decaying into new neutral scalar or pseudoscalar bosons

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