Single top production via FCNC couplings at an e^-e⁺ collider with center-of-mass energy √(s)=240 GeV

2022/02/09 by Arroyo-Ureña, M. A., Díaz-Cruz, J. Lorenzo, Gaitán, R. +2
#FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph)

paper · doi:10.48550/arxiv.2202.04572

Abstract

Aspects of top quark physics can be studied at a future Circular Electron-Positron Collider (CEPC). In particular, Flavor-Changing Neutral Current interactions (FCNC) of the top quark can be studied even with a center-of-mass energy from √(s)\gtrsim m_t to √(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^-→ V → tc (V=Z, Z^′) provide 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.

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