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|Paper IPM / Particles / 13989||
In this paper, a detailed study to probe the top quark flavour-changing neutral currents tqγ
and tqZ at the future e−e+ collider FCC-ee/TLEP in three different center-of-mass energies
of 240, 350 and 500 GeV is presented.
A set of useful variables are proposed and used in a multivariate technique to separate signal
e− e+ → Z/γ→ t ―q ( ―t q ) from standard model background events.
The 3σ discovery regions and the upper limits on the FCNC branching ratios at 95% C.L in terms of the integrated luminosity are presented.
It is shown that with 100 fb−1 of integrated luminosity of data, FCC-ee would be able to exclude the effective coupling strengths above O (10−4−10−5) which is corresponding to branching fraction of O(0.01−0.001)%. We show that moving to a high-luminosity regime leads to a significant improvement on the bounds on the top anomalous couplings
to a photon or a Z boson.
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