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In the Standard Model (SM), flavour changing neutral current (FCNC) topdecays, possible at loop level only, are very strongly suppressed. Observationof any such decay would be a direct signature of physics beyond the SM. Largeenhancements are possible in many "new physics" scenarios and the largestenhancement is in most cases expected for the $t\rightarrow cH$ decay. A fullstudy for CLIC was based on the WHIZARD simulation of FCNC top decays withinthe 2HDM(III) model. Beam polarization and beam-induced background were takeninto account. Top pair production events with the FCNC decay $t\rightarrow cH$can be identified based on kinematic constrains and flavour tagginginformation. Due to a large overlap in the kinematic space with standard toppair events, the final signal selection-efficiency is small, at the 10% level.Expected limits on $BR(t\rightarrow cH)\times BR(H\rightarrow b\bar{b})$ arecompared with earlier results based on parton level simulation.

Sensitivity of CLIC at 380 GeV to the top FCNC decay $t\rightarrow cH$