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Study of hadronic events and measurements of a s between 30 and 91 GeV L 3 Collaboration

semanticscholar(2019)

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Abstract
We have studied the structure of hadronic events with a hard, isolated photon in the final state (e+e_—> Z -» hadrons + y) in the 3.6 million hadronic events collected with the L3 detector at centre-of-mass energies around 91 GeV. The centre-of-mass energy of the hadronic system is in the range 30 GeV to 86 GeV. Event shape variables have been measured at these reduced centre-of-mass energies and have been compared with the predictions of different QCD Monte Carlo programs. The event shape variables and the energy dependence of their mean values are well reproduced by QCD models. 5 Supported by the Hungarian OTKA fund under contract numbers T14459 and T24011. 6 Supported also by the Comisión Interministerial de Ciencia y Technologia. p Massachusetts Institute of Technology, Cambridge, MA 02139, USA q INFN Sezione di Firenze and University of Florence, 1-50125 Florence, Italy r European Laboratory for Particle Physics, CERN, CH-1211 Geneva 23, Switzerland s World Laboratory, FBLJA Project, CH-1211 Geneva 23, Switzerland 1 University of Geneva, CH-1211 Geneva 4, Switzerland u Chinese University of Science and Technology, USTC, Hefei, Anhui 230 029, China 4 v SEFT, Research Institute for High Energy Physics, P.O. Box 9, SF-00014 Helsinki, Finland w University of Lausanne, CH-1015 Lausanne, Switzerland x INFN-Sezione di Lecce and Università Degli Studi di Lecce, 1-73100 Lecce, Italy y Los Alamos National Laboratory, Los Alamos, NM 87544, USA L Institut de Physique Nucléaire de Lyon, IN2P3-CNRS, Università Claude Bernard, F-69622 Villeurbanne, France “““ Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, CIEMAT, E-28040 Madrid, Spain 6 ab INFN-Sezione di Milano, 1-20133 Milan, Italy ac Institute of Theoretical and Experimental Physics, ITEP, Moscow, Russia ad INFN-Sezione di Napoli and University of Naples, I-80I25 Naples, Italy “ Department of Natural Sciences, University of Cyprus, Nicosia, Cyprus af University of Nijmegen and NIKHEF, NL-6525 ED Nijmegen, The Netherlands a* Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA * California Institute of Technology, Pasadena, CA 91125, USA “ INFN-Sezione di Perugia and Università Degli Studi di Perugia, 1-06100 Perugia, Italy “j Camegie Mellon University, Pittsburgh, PA 15213, USA ak Princeton University, Princeton, NJ 08544, USA al INFN-Sezione di Roma and University of Rome, “La Sapienza”, 1-00185 Rome, Italy am Nuclear Physics Institute, St. Petersburg, Russia a" University and INFN, Salerno, 1-84100 Salerno, Italy a° University of California, San Diego, CA 92093, USA ap Dept, de Fisica de Partículas Elementales, Univ, de Santiago, E-15706 Santiago de Compostela, Spain Bulgarian Academy of Sciences, Central Lab. of Mechatronics and Instrumentation, BU-1113 Sofia, Bulgaria “ Center for High Energy Physics, Korea Adv. Inst, of Sciences and Technology, 305-701 Taejon, South Korea as University of Alabama, Tuscaloosa, AL 35486, USA “ Utrecht University and NIKHEF, NL-3584 CB Utrecht, The Netherlands “ Purdue University, West Lafayette, IN 47907, USA av Paul Scherrer Institut, PSI, CH-5232 Villigen, Switzerland aw DESY-Institut für Hochenergiephysik, D-15738 Zeuthen, FRG “ Eidgenössische Technische Hochschule, ETH Zürich, CH-8093 Zürich, Switzerland ay University of Hamburg, D-22761 Hamburg, FRG az High Energy Physics Group, Taiwan, ROC Received 23 June 1997 Editor: K. Winter M. Acciarri et al./Physics Letters B 411 (1997) 339-353 343 We fit distributions of several global event shape variables to resummed calculations to determine the strong coupling constant as over a wide range of energies. We find that the strong coupling constant as decreases with increasing energy, as expected from QCD. © 1997 Elsevier Science B.V.
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