2019
DOI: 10.1007/jhep01(2019)072
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The top-quark window on compositeness at future lepton colliders

Abstract: In composite Higgs (CH) models, large mixings between the top quark and the new strongly interacting sector are required to generate its sizeable Yukawa coupling. Precise measurements involving top as well as left-handed bottom quarks therefore offer an interesting opportunity to probe such new physics scenarios. We study the impact of third-generation-quark pair production at future lepton colliders, translating prospective effective-field-theory sensitivities into the CH parameter space. Our results show tha… Show more

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Cited by 21 publications
(18 citation statements)
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“…In Figure 4, we present the global fit results for the future collider scenarios introduced in the previ- 2 The potential of the 500 GeV ILC and the initial stage at √ s = 380 GeV of the CLIC project [12,16,73] is found to be very similar for the relevant two-fermion operators, when rescaled by the appropriate integrated luminosity [4]. ous sections.…”
Section: Global Fit On Prospectsmentioning
confidence: 99%
“…In Figure 4, we present the global fit results for the future collider scenarios introduced in the previ- 2 The potential of the 500 GeV ILC and the initial stage at √ s = 380 GeV of the CLIC project [12,16,73] is found to be very similar for the relevant two-fermion operators, when rescaled by the appropriate integrated luminosity [4]. ous sections.…”
Section: Global Fit On Prospectsmentioning
confidence: 99%
“…Our study is just the beginning of an understanding of the discrimination between UV theories from SMEFT fits [61]. Follow-up work could include information from top physics [62][63][64][65][66][67], a consideration of the importance of the quadratic versus linear SMEFT approximation [12], and complete 1-loop matching. The complete 1-loop matching contributions exist for the singlet model [15,68,69], but not for the VLQ models where there are missing heavy-light contributions [70,71].…”
Section: Discussionmentioning
confidence: 99%
“…Finally, the importance of high collision energies for this type of probes is reflected in FCC-ee bounds on c te , c t , which are approximately an order of magnitude weaker, yielding a significantly lower sensitivity f | FCC-ee tt > 1.6 TeV (c te < 4.3 × 10 −3 TeV −2 [93]), see figure 11. 13 To some extent, our analysis resembles that of [92]. However, as in previous sections, we focus on a single operator at a time, the one leading to the largest sensitivity in a given region of the (m * , g * ) parameter space, which is not always the same operator as claimed in that study.…”
Section: Future Electron-positron Collidersmentioning
confidence: 95%