Bounding the $Z^{\prime }tc$ coupling from $D^0-\overline{D^0}$ mixing and single top production at the ILC

Abstract

In the present work the $Z^{\prime }tc$ coupling is bounded by using the current experimental data on the $D^0-\overline{D^0}$ meson-mixing system. It is found that the strength associated to this coupling is less than $5.75\times 10^{-2}$. The single top production through the $e^{+}{e}^{-}\to Z^{\prime }\to tc$ process at the $Z^{\prime }$ boson resonance is studied and we found that around $10^7$ $tc$ events will be expected at the International Linear Collider. For the $Z^{\prime }\to tc$ decay, we predict a branching ratio of $10^{-2}$.

Comments: Revised version. Now, 11 pages and 6 figures