$e^{+}{e}^{-}\to Z^0{Z}^0\to b\bar{b}c\bar{c}$ events as model independent probe of colour reconnection effects

According to the basic properties of QCD, colour reconnection effects can occur in hadronic processes at high energies. The comparison of $e^{+}e^{-}\to Z^0Z^0\to q\bar{q}q’\bar{q’}$eventswiththesuperpositionof$Z^0\to q\bar{q}$and$Z^0\to q’\bar{q’}$ events from LEP1 would provide an unambiguous model-independent probe. We show that at LEP2 energy, the background processes are negligible if we select only $e^{+}{e}^{-}\to Z^0{Z}^0\to b\bar{b}c\bar{c}$ events, and limit the measurements in the phase space of on-shell $Z^0{Z}^0$ events.