<i>t</i>′ at the LHC: the physics of discovery

Holdom, Bob

doi:10.1088/1126-6708/2007/03/063

Cited by 81 publications

(67 citation statements)

References 21 publications

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“…We shall also show that for large t 1 -masses the branching ratios for the decay of t 1 into a W + and a bottomquark, a Z and a top-quark, and a top-quark and Higgs boson, are in an approximate 2:1:1 relation, as required by the Goldstone equivalence theorem. Moreover, we will show that the technique of massive jets [33], [35] becomes very important for the reconstruction of the t 1 modes. This article is organized as follows.…”

Section: Introductionmentioning

confidence: 93%

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Collider phenomenology of Gauge-Higgs unification scenarios in warped extra dimensions

et al. 2008

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We compute the couplings of the zero modes and first excited states of gluons, W 's, Z gauge bosons, as well as the Higgs, to the zero modes and first excited states of the third generation quarks, in an RS Gauge-Higgs unification scenario based on a bulk SO(5) × U (1) X gauge symmetry, with gauge and fermion fields propagating in the bulk. Using the parameter space consistent with electroweak precision tests and radiative electroweak symmetry breaking, we study numerically the dependence of these couplings on the parameters of our model. Furthermore, after emphasizing the presence of light excited states of the top quark, which couple strongly to the Kaluza Klein gauge bosons, the associated collider phenomenology is analyzed. In particular, we concentrate on the possible detection of the first excited state of the top, t 1 , which tends to have a higher mass than the ones accessible via regular QCD production processes. We stress that the detection of these particles is still possible due to an increase in the pair production of t 1 induced by the first excited state of the gluon, G 1 .

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Section: Introductionmentioning

confidence: 93%

“…This fermion state, due to gauge invariance, couples with regular SM QCD gluons with a strength given by the strong coupling and as stressed before, its signatures have been studied in detail in [32], [33], [35], showing a potential reach for these particles with a mass up to about m t 1 ∼ 1 TeV.…”

Section: Signal and Background Simulationmentioning

confidence: 99%

Collider phenomenology of Gauge-Higgs unification scenarios in warped extra dimensions

et al. 2008

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“…Their jet substructure allows us to search for hadronic decays for example of Higgs bosons [1], weak gauge bosons [2][3][4], or top quarks [5][6][7][8][9][10][11][12][13][14][15] in a shower evolution otherwise described by QCD radiation [16][17][18][19]. Given this success, a straightforward question to ask is whether we can analyze the same jet substructure patterns without relying on advanced QCD algorithms.…”

Section: Introductionmentioning

confidence: 99%

Deep-learning top taggers or the end of QCD?

Kasieczka

Plehn²,

Russell

et al. 2017

J. High Energ. Phys.

217

285

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Machine learning based on convolutional neural networks can be used to study jet images from the LHC. Top tagging in fat jets offers a well-defined framework to establish our DeepTop approach and compare its performance to QCD-based top taggers. We first optimize a network architecture to identify top quarks in Monte Carlo simulations of the Standard Model production channel. Using standard fat jets we then compare its performance to a multivariate QCD-based top tagger. We find that both approaches lead to comparable performance, establishing convolutional networks as a promising new approach for multivariate hypothesis-based top tagging.

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“…However, this process has a small cross section that is largely insensitive to finite top-partner masses. Top-partners can be searched for directly, both produced in pairs pp → TT and singly produced pp → T + X [48][49][50][51][52][53][54][55][56][57][58][59][60]. However, direct production carries more model dependence since the search strategies and limits depend on how the top-partner decays -an aspect of the model usually unrelated to electroweak symmetry breaking.…”

Section: Introductionmentioning

confidence: 99%

Probing top-partners in Higgs+jets

Banfi

Martin

Sanz

2014

J. High Energ. Phys.

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Fermionic top-partners arise in models such as Composite Higgs and Little Higgs. They modify Higgs properties, in particular how the Higgs couples to top quarks. Alas, there is a low-energy cancellation acting in the coupling of the Higgs boson to gluons and photons. As a result of this cancellation, no information about the spectrum and couplings of the top-partners can be obtained in gg → h, just the overall new physics scale f . In this paper we show that this is not the case when hard radiation is taken into account. Indeed, differential distributions in Higgs plus jets are sensitive to the top-partner mass and coupling to the Higgs. We exploit the transverse momentum distribution of the hard jet to estimate limits on the top-partners in the 14 TeV LHC run. Relying on h → γγ events alone, we find mixing angles of sin 2 (θ R ) 0.2 can be probed after 3000 fb −1 of 14 TeV LHC data. Including other modes, the sensitivity improves, up to sin 2 (θ R ) 0.05 after 300 fb −1 .

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t′ at the LHC: the physics of discovery

Cited by 81 publications

References 21 publications

Collider phenomenology of Gauge-Higgs unification scenarios in warped extra dimensions

Collider phenomenology of Gauge-Higgs unification scenarios in warped extra dimensions

Deep-learning top taggers or the end of QCD?

Probing top-partners in Higgs+jets

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