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Top quark FCNCs in extended Higgs sectors
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abstract
The large number of top quarks produced at the LHC and possible future hadron colliders allows to study rare decays of this particle. In many well motivated models of new physics, for example in non-minimal composite-Higgs models, the existence of scalar singlets can induce new flavor-violating top decays surpassing the Higgs contribution by orders of magnitude. We study the discovery prospects of rare top decays within such models and develop new search strategies to test these interactions in top pair-produced events at the LHC. We demonstrate that scales as large as $10$--$50$ TeV can be probed. Improvements by factors of $\sim 1.5$ and $\sim 3$ can be obtained at $\sqrt{s} = 27$ TeV and $\sqrt{s} = 100$ TeV colliders.
Forward citations
Cited by 2 Pith papers
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Search for pair-production of vector-like $T$ quarks decaying into a top quark and a spin-0 particle in the diphoton final state in proton proton collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
No excess is observed in a first ATLAS search for pair-produced vector-like T quarks decaying via an exotic spin-0 particle to diphotons; fiducial cross-section limits and a model exclusion up to m_T≈1620 GeV are set.
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Effective field theory and scalar extensions of the top quark sector
For a heavy scalar coupled to top quarks, only an NLO-matched effective field theory reproduces the full model across the LHC energy range, while a leading-order fit overestimates the high-mass tail and LHC constraints.
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