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.
Probing top flavour-changing neutral couplings at TESLA
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abstract
We present a comprehensive analysis of the sensitivity of the TESLA e+ e- collider to top flavour-changing neutral couplings to the Z boson and photon. We study single top production and top decay processes, and we consider the cases without beam polarization, with only e- polarization and with e- and e+ polarization. We show that the use of the latter substantially enhances the sensitivity to discover or bound these vertices, and for some of the couplings the expected LHC limits could be improved by factors 2-14 for equal running times.
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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.