Probing the Top Quark Flavour-Changing Neutral Current at a Future Electron-Positron Collider

Abstract EN

We present a study to examine the sensitivity of a future e - e + collider to the anomalous top flavour-changing neutral current (FCNC) to the gluon.

To separate signal from background a multivariate analysis is performed on top quark pair and background events, where one top quark is considered to follow the dominant standard model (SM) decay, t → W b , and the other top decays through FCNC, t → q g , where q is a u - or a c -quark.

The analysis of fully hadronic FCNC decay of the t t - pair is also presented.

The 95% confidence level limits on the top quark anomalous couplings are obtained for different values of the center-of-mass energies and integrated luminosities.