10.3929/ETHZ-B-000000622
ALEPH Collaboration
Schael, S.
Dissertori, Günther
et al.
Test of colour reconnection models using three-jet events in hadronic Z decays
ETH Zurich
2006
Journal Article
2006-12
en
application/pdf
Creative Commons Attribution 4.0 International
info:eu-repo/semantics/openAccess
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.
The European Physical Journal C, 48 (3)
ISSN:1434-6044
ISSN:1434-6052