Abstract
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 R0 parameter in the range 0.01-0.02.
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Schael, S., Barate, R., Brunelière, R. et al. Test of colour reconnection models using three-jet events in hadronic Z decays. Eur. Phys. J. C 48, 685–698 (2006). https://doi.org/10.1140/epjc/s10052-006-0017-5
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DOI: https://doi.org/10.1140/epjc/s10052-006-0017-5