TY - JOUR

T1 - Test of Colour Reconnection Models using Three-Jet Events in Hadronic Z Decays.

AU - Schael, S.

AU - Bouhova-Thacker, E. V.

AU - Bowdery, C. K.

AU - Finch, A. J.

AU - Jones, Roger W. L.

AU - Hughes, Gareth

AU - Smizanska, Maria

AU - ALEPH, collaboration

PY - 2006/12

Y1 - 2006/12

N2 - 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.

AB - 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.

U2 - 10.1140/epjc/s10052-006-0017-5

DO - 10.1140/epjc/s10052-006-0017-5

M3 - Journal article

VL - 48

SP - 685

EP - 698

JO - European Physical Journal C: Particles and Fields

JF - European Physical Journal C: Particles and Fields

SN - 1434-6044

IS - 3

ER -