Test of Colour Reconnection Models using Three-Jet Events in Hadronic Z Decays

Details Test of Colour Reconnection Models using Three-Jet Events in Hadronic Z Decays Test of Colour Reconnection Models using Three-Jet Events in Hadronic Z Decays

2006-04-21

arxiv.org/abs/hep-ex/0604042v1

Eur.Phys.J.C48:685-698,2006

Physics

High Energy Physics

High Energy Physics - Experiment

21 pages, 11 figures

Scientific paper

10.1140/epjc/s10052-006-0017-5

Hadronic Z decays into three jets are used to test QCD models of colour reconnection (CR). A sensitive quantity is the rate of gluon jets with a gap in the particle rapidity distribution and zero jet charge. Gluon jets are identified by either energy-ordering or by tagging two b-jets. The rates predicted by two string-based tunable CR models, one implemented in JETSET (the GAL model), the other in ARIADNE, are too high and disfavoured by the data, whereas the rates from the corresponding non-CR standard versions of these generators are too low. The data can be described by the GAL model assuming a small value for the R_0 parameter in the range 0.01-0.02.

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