Abstract
We present a study to examine the sensitivity of a futuree-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→Wb, and the other top decays through FCNC,t→qg, whereqis au- or ac-quark. The analysis of fully hadronic FCNC decay of thett-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.
Highlights
The top quark, which is the heaviest known elementary particle up to now, plays a special role in search for new physics beyond the standard model (SM) in particular through precise measurement of its couplings with other particles
As it can be seen from the figure, higher integrated luminosities lead to better bounds on the branching ratio up to around 500 fb−1
It is interesting to mention here that the dependence of the expected upper limit on the integrated luminosity becomes weaker at luminosities larger than 500 fb−1
Summary
The top quark, which is the heaviest known elementary particle up to now, plays a special role in search for new physics beyond the standard model (SM) in particular through precise measurement of its couplings with other particles. The high luminosity and clean experimental environments of the TeV scale e−e+ collider make it an excellent precision machine for the investigation of the top quark properties. It provides us with an important opportunity for precise measurements of the FCNC couplings in top quark sector [2, 17]. We study the sensitivity of a future electronpositron collider (CLIC or ILC) to the anomalous top flavourchanging neutral current (FCNC) to the gluon, t − q − g.
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