Studies of Fragmentation and Colour Reconnection at LEP

TL;DR

This paper investigates Colour Reconnection and QCD coherence effects in hadronic Z pole events at LEP, comparing experimental data with Monte Carlo models and other experimental results to understand strong interaction phenomena.

Contribution

It provides a comparative analysis of Colour Reconnection effects using different Monte Carlo models and tests QCD coherence through hadron multiplicity distributions at LEP.

Findings

No definitive evidence of Colour Reconnection effects was observed.

QCD coherence effects are consistent with theoretical expectations.

Comparison between LEP e+e- data and HERA e+p data supports the current understanding of QCD phenomena.

Abstract

Hadronic events at the Z pole have been investigated in search for Colour Reconnection effects and QCD coherence. Colour Reconnection effects are searched for in three-jet events and the data results are compared to the predictions of different Monte Carlo models. QCD colour coherence effects are tested through the multiplicity distributions of hadrons with restricted momenta, and the LEP1 e+e- data is compared to HERA e+p data under the equivalence assumption of the e+e- hemisphere with the current region of the Breit frame of reference.