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

Research output: Contribution to journalJournal article


<mark>Journal publication date</mark>12/2006
<mark>Journal</mark>European Physical Journal C: Particles and Fields
Issue number3
Number of pages14
Pages (from-to)685-698
<mark>Original language</mark>English


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.