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

TL;DR

This paper proposes a model-independent method to probe colour reconnection effects in high-energy hadronic processes by analyzing specific $e^{+}e^{-} o Z^0Z^0$ events, focusing on $bar{b}car{c}$ final states at LEP2.

Contribution

It introduces a novel, model-independent approach using $bar{b}car{c}$ events to study colour reconnection effects at LEP2 energies.

Findings

Background processes are negligible at LEP2 for selected events.

The method limits measurements to on-shell $Z^0Z^0$ phase space.

Provides a clear experimental probe of colour reconnection effects.

Abstract

According to the basic properties of QCD, colour reconnection effects can occur in hadronic processes at high energies. The comparison of $e^{+}e^{-}\to Z^0Z^0\to q\bar{q}q'\bar{q'}$ events with the superposition of $Z^0\to q\bar{q}$ 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 $e^{+}e^{-}\to Z^0Z^0\to b \bar{b}c\bar{c}$ events, and limit the measurements in the phase space of on-shell $Z^0Z^0$ events.