Single top production via FCNC couplings at an $$e^{-}e^{+}$$ e - e + collider with center-of-mass energy $$\sqrt{s}=240$$ s = 240 GeV

Aspects of top quark physics can be studied at a future Circular Electron-Positron Collider. In particular, flavor-changing neutral current interactions (FCNC) of the top quark can be studied even with a center-of-mass energy from $$\sqrt{s}\gtrsim m_t$$ to $$\sqrt{s}=240$$ GeV, through the production a single top quark in association with a charm quark, which can arise in several scenarios of new physics. We explore here this signal within the Left-Right Mirror Model, which is a Left-Right model that includes mirror fermions; this model is motivated as a possible solution to the strong CP problem and by its rich phenomenology. We find that for particular scenarios of the model parameters, which are in agreement with the most up-to-date experimental constraints, the signal coming from the process $$e^+e^-\rightarrow V \rightarrow tc$$ ( $$V=Z,\,Z^{\prime }$$ ) provides a detectable signal and thus, it can give evidence for FCNC interactions; in these scenarios, the mass of a new neutral gauge boson can be as high as $$m_{Z'}=7$$ TeV.