Journal
PHYSICS LETTERS B
Volume 775, Issue -, Pages 25-31Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2017.10.047
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Funding
- School of Particles and Accelerators, Institute for Research in Fundamental Sciences (IPM)
- University of Science and Technology of Mazandaran
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In this paper, a detailed study to probe the top quark Flavour-Changing Neutral Currents (FCNC) tq gamma and tqZ at the future e(-)e(+) collider FCC-ee in two different center-of-mass energies of 240 and 350 GeV is presented. Aset of useful variables are proposed and used in a multivariate technique to separate signal e(-)e(+) -> Z/gamma -> t (q) over bar (t (q) over bar) from Standard Model background processes. The study includes a fast detector simulation based on the DELPHES package to consider the detector effects. The upper limits on the FCNC branching ratios at 95% confidence level (CL) in terms of the integrated luminosity are presented. It is shown that with 300 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 upper bounds on the top quark FCNC couplings to a photon or a Zboson. (C) 2017 The Author(s). Published by Elsevier B.V.
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