Muon colliders at 14 TeV with 20 ab^{-1} can set upper limits on BR(t → qZ) at O(10^{-8}), improving on CMS/ATLAS by 2-3 orders via polarized beams and fat-jet reconstruction.
Top flavour-changing neutral interactions: theoretical expectations and experimental detection
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abstract
Top flavour-changing neutral interactions with a light quark q=u,c and a gauge or Higgs boson are very suppressed within the Standard Model (SM), but can reach observable levels in many of its extensions. We review the possible size of the effective vertices Ztq, gamma tq, gtq and Htq in several SM extensions, and discuss the processes in which these interactions might show up at LHC and at a high energy e+ e- linear collider.
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A 10 TeV muon collider with 10 ab^{-1} could reach O(10^{-3}) sensitivity on top-quark FCNC couplings, improving current ATLAS/CMS bounds by more than an order of magnitude.
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Probing Anomalous $t{\bar q}Z$ Interactions at Muon Colliders
Muon colliders at 14 TeV with 20 ab^{-1} can set upper limits on BR(t → qZ) at O(10^{-8}), improving on CMS/ATLAS by 2-3 orders via polarized beams and fat-jet reconstruction.
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Sensitivity to top-quark FCNC interactions at future muon colliders
A 10 TeV muon collider with 10 ab^{-1} could reach O(10^{-3}) sensitivity on top-quark FCNC couplings, improving current ATLAS/CMS bounds by more than an order of magnitude.