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 R(0) parameter in the range 0.01-0.02.

Test of colour reconnection models using three-jet events in hadronic Z decays / Schael, S., Barate, R., Bruneliere, R., De Bonis, I., Decamp, D., Goy, C., Jezequel, S., Lees, J.p., Martin, F., Merle, E., Minard, M.n., Pietrzyk, B., Trocme, B., Bravo, S., Casado, M.p., Chmeissani, M., Crespo, J.m., Fernandez, E., Fernandez Bosman, M., Garrido, L., et al.. - In: THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6044. - 48:3(2006), pp. 685-698. [10.1140/epjc/s10052-006-0017-5]

Test of colour reconnection models using three-jet events in hadronic Z decays

CREANZA, Donato Maria;DE FILIPPIS, Nicola;IASELLI, Giuseppe;MAGGI, Giorgio Pietro;
2006

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 R(0) parameter in the range 0.01-0.02.
2006
Test of colour reconnection models using three-jet events in hadronic Z decays / Schael, S., Barate, R., Bruneliere, R., De Bonis, I., Decamp, D., Goy, C., Jezequel, S., Lees, J.p., Martin, F., Merle, E., Minard, M.n., Pietrzyk, B., Trocme, B., Bravo, S., Casado, M.p., Chmeissani, M., Crespo, J.m., Fernandez, E., Fernandez Bosman, M., Garrido, L., et al.. - In: THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6044. - 48:3(2006), pp. 685-698. [10.1140/epjc/s10052-006-0017-5]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11589/3672
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