12,000

We have over 12,000 students, from over 100 countries, within one of the safest campuses in the UK

93%

93% of Lancaster students go into work or further study within six months of graduating

Home > Research > Publications & Outputs > Test of Colour Reconnection Models using Three-...
View graph of relations

« Back

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

Research output: Contribution to journalJournal article

Published

Journal publication date12/2006
JournalEuropean Physical Journal C: Particles and Fields
Journal number3
Volume48
Number of pages14
Pages685-698
Original languageEnglish

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.