Search for Colour Singlet and Colour Reconnection Effects in Hadronic Z Decays at LEP

TL;DR

This paper investigates the presence of colour singlet production and colour reconnection effects in hadronic Z decays at LEP by analyzing angular asymmetries in 3-jet events, setting upper limits on these phenomena.

Contribution

It provides the first experimental constraints on colour singlet and reconnection effects in Z decays using angular asymmetries in symmetric 3-jet events.

Findings

Upper limits established for colour singlet production

Upper limits established for colour reconnection effects

Asymmetries are sensitive indicators for these effects

Abstract

A search is performed in symmetric 3-jet hadronic Z decay events for evidence of colour singlet production or colour reconnection effects. Asymmetries in the angular separation of particles are found to be sensitive indicators of such effects. Upper limits on the level of colour singlet production and colour reconnection effects are established for a variety of models.