Ultraboosted $Zt$ and $\gamma t$ production at the HL-LHC and FCC-hh

Abstract

Searches for anomalous $Zt$ and $\gamma t$ production provide an excellent probe of flavour-changing top interactions when the energies considered are very large. In this note we estimate the sensitivity to these interactions at the high luminosity phase of the LHC and a future 100 TeV $pp$ collider (FCC-hh). For the LHC, the expected limits on $t\to uZ/u\gamma$ branching ratios from $Zt$ and $\gamma t$ production will reach the $10^{-5}$ level, one order of magnitude better than the existing projections for $t\to uZ$ from $t\bar{t}$ production. For the FCC-hh, the limits on $t\to uZ/u\gamma$ could reach an impressive sensitivity at the $10^{-6}$ level, with limits on $t\to cZ/c\gamma$ at the $10^{-5}$ level.

LaTeX 11 pages. Plots fixed, journal version

References in corpus (3)

• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• Pinning down top dipole moments with ultra-boosted tops
• Identifying boosted new physics with non-isolated leptons

Cited by in corpus (4)

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• New physics with boosted single top production at the LHC and future colliders
• Leveraging on-shell interference to search for FCNCs of the top quark and the Z boson
• Pulling the Higgs and Top needles from the jet stack with Feature Extended Supervised Tagging