Top quark FCNCs in extended Higgs sectors

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.

18 pages, 4 figures. V3: one typo corrected

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• Constraining four-fermion operators using rare top decays
• Effective field theory and scalar extensions of the top quark sector
• Top quark anomalous FCNC production via $tqg$ couplings at FCC-hh
• Probing anomalous $tq\gamma$ and $tqg$ couplings via single top production in association with photon at FCC-hh
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• Probing the anomalous $tq\gamma$ couplings through single top production at the future lepton-hadron colliders
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• Top Rare Decays t-> cV in the Mirror Twin Higgs Models
• Novel flavour-changing neutral currents in the top quark sector
• Flavor signatures of complex anomalous $tcZ$ couplings
• Sensitivity analysis for the anomalous $tq\gamma$ couplings via $\gamma q\to t\gamma$ subprocess in photon-proton collisions at the FCC-$\mu$p
• Investigation of the FCNC couplings between the top quark and the photon in $\gamma \gamma$ and ${\gamma }^{\ast }{\gamma }^{\ast }$ collisions at the CLIC
• The ALPs from the Top: Searching for long lived axion-like particles from exotic top decays
• Exploring Anomalous Flavor-Changing Neutral tqh Transitions at Future Muon Colliders: Insights from ${\mu }^{+}{\mu }^{-}\to t\bar{q}h$ Interactions