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doi:10.1016/0370-2693(92)92023-A 
Copyright © 1992 Published by Elsevier Science B.V. All rights reserved.
Study of orientation of three-jet events in Z0 hadronic decays using the DELPHI detector
a LIP, Av. Elias Garcia 14 - le, P-1000, Lisbon Codex, Portugal b Institut für Hochenergiephysik, Österreichische Akademie der Wissenschaften, Nikolsdorfergasse 18, A-1050, Vienna, Austria c DPhPE, CEN-Saclay, F-91191, Gif-Sur-Yvette Cedex, France d Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX, UK e Department of Physics, University of Lund, Sölvegatan 14, S-223 63, Lund, Sweden f Joint Institute for Nuclear Research, Dubna, Head Post Office, P.O. Box 79, SU-101 000, Moscow, USSR g Instituto de Fisica Corpuscular (IFIC), Centro Mixto Universidad de Valencia-CSIC, Avda. Dr. Moliner 50, E-46100, Burjassot (Valencia, Spain h Department of Physics, University of Bergen, Allégaten 55, N-5007, Bergen, Norway i CERN, CH-1211, Geneva 23, Switzerland j Physics Laboratory, University of Athens, Solonos Street 104, GR-10680, Athens, Greece k Université Claude Bernard de Lyon, 43 Boulevard du 11 Novembre 1918, F-69622, Villeurbanne Cedex, France l Institut für Experimentelle Kernphysik, Universität Karlsruhe, Pf. 6980, W-7500, Karlsruhe 1, FRG m Institute of Physics, University of Stockholm, Vanadisvägen 9, S-113 46, Stockholm, Sweden n LPNHE, Universités Paris VI et VII, Tour 33 (RdC), 4 place Jussieu, F-75230, Paris Cedex 05, France o Laboratoire de l'Accélérateur Linéaire, Université de Paris-Sud, Bâtiment 200, F-91405, Orsay, France p Dipartimento di Fisica, Università di Trieste and INFN, Via A. Valerio 2, I-34127, Trieste, Italy p1 Istituto di Fisica, Università di Udine, Via Larga 36, I-33100, Udine, Italy q Istituto Superiore di Sanità, Istituto Nazionale di Fisica Nucleare (INFN), Viale Regina Elena 299, I-00161, Rome, Italy r Dipartimento di Fisica, Università di Milano and INFN, Via Celoria 16, I-20133, Milan, Italy s Nuclear Physics Laboratory, University of Oxford, Keble Road, Oxford OX1 3RH, UK t Fachbereich Physik, University of Wuppertal, Pf. 100 127, W-5600, Wuppertal 1, FRG u Dipartimento di Fisica, Università di Genova and INFN, Via Dodecaneso 33, I-16146, Genoa, Italy v Laboratoire de Physique Corpusculaire, Collège de France, 11 place M. Berthelot, F-75231, Paris Cedex 5, France w Institute for High Energy Physics, Serpukhov, P.O. Box 35, SU-142 284, Protvino (Moscow Region), USSR x Institute of Nuclear Physics, Nuclear Research Centre Demokritos, P.O. Box 60228, GR-15310, Athens, Greece y Division des Hautes Energies, CRN-Groupe DELPHI and LEPSI, B.P. 20 CRO, F-67037, Strasbourg Cedex, France z Physics Department, Universitaire Instelling Antwerpen, Universiteitsplein 1, B-2610, Wilrijk, Belgium z1 IIHE, ULB-VUB, Pleinlaan 2, B-1050, Brussels, Belgium z2 Service de Physique des Particules Elémentaires, Faculté des Sciences, Université de l'Etat Mons, Av. Maistriau 19, B-7000, Mons, Belgium aa Department of Physics, University of Liverpool, P.O. Box 147, Liverpool L69 3BX, UK ab Dipartimento di Fisica Sperimentale, Università di Torino and INFN, Via P. Giuria 1, I-10125, Turin, Italy ac NIKHEF-H, Postbus 41882, NL-1009 DB, Amsterdam, The, Netherlands ad Department of Radiation Sciences, University of Uppsala, P.O. Box 535, S-751 21, Uppsala, Sweden ae Dipartimento di Fisica, Università di Padova and INFN, Via Marzolo 8, I-35131, Padua, Italy af Research Institute for High Energy Physics, University of Helsinki, Siltavuorenpenger 20 C, SF-00170, Helsinki 17, Finland ag Physics Department, University of Oslo, Blindern, N-1000, Oslo 3, Norway ah Facultad de Ciencias, Universidad de Santander, av. de los Castros, E-39005, Santander, Spain ai Dipartimento di Fisica, Università di Roma II and INFN, Tor Vergata, I-00173, Rome, Italy aj Dipartimento di Fisica, Università di Bologna and INFN, Via Irnerio 46, I-40126, Bologna, Italy ak Departamento de Fisica Atomica Molecular y Nuclear, Universidad Complutense, Avda. Complutense s/n, E-28040, Madrid, Spain al Ames Laboratory and Department of Physics, Iowa State University, Ames, IA 50011, USA am Niels Bohr Institute, Blegdamsvej 17, DK-2100, Copenhagen Ø, Denmark an Institute for Nuclear Studies, and University of Warsaw, Ul. Ho
a 69, PL-00681, Warsaw, Poland ao Physics Department, National Technical University, Zografou Campus, GR-15773, Athens, Greece ap High Energy Physics Laboratory, Institute of Nuclear Physics, Ul. Kawiory 26 a, PL-30055, Cracow 30, Poland aq Faculté des Sciences de Luminy, Université d'Aix - Marseille II, Case 907, 70, route Léon Lachamp, F-13288, Marseille Cedex 09, France
Received 15 October 1991.
Available online 24 October 2002.
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Abstract
The study of the orientation of three-jet events from e+e− → Z0 → multi-hadrons is presented, in particular the polar angle distributions of the thrust axis and of the normal to the three-jet plane, and the azimuthal correlations between the hadron plane and the one defined by the beam and thrust axes. The data are compared with results at lower energy and with QCD predictions. Good agreement with QCD predictions is observed. The scalar gluon theory is excluded by the data.
