Abstract
The search for an additional heavy gauge boson Z′ is described. The models considered are based on either a superstring-motivated E6 or on a left-right symmetry and assume a minimal Higgs sector. Cross sections and asymmetries measured with the L3 detector in the vicinity of the Z resonance during the 1990 and 1991 running periods are used to determine limits on the Z-Z′ gauge boson mixing angle and on the Z′ mass. For Z′ masses above the direct limits, we obtain the following allowed ranges of the mixing angle, θM at the 95% confidence level: -0.004 {slanted equal to or less-than} θM {slanted equal to or less-than} 0.015 for the χ model, -0.003 {slanted equal to or less-than} θM {slanted equal to or less-than} 0.020 for the ψ model, -0.029 {slanted equal to or less-than} θM {slanted equal to or less-than} 0.010 for the η model, -0.002 {slanted equal to or less-than} θM {slanted equal to or less-than} 0.020 for the LR model,.
| Original language | English |
|---|---|
| Pages (from-to) | 187-196 |
| Number of pages | 10 |
| Journal | Physics Letters B |
| Volume | 306 |
| Issue number | 1-2 |
| DOIs | |
| State | Published - May 27 1993 |
Funding
a L Physikalisches Institut, RWTH, W-5100 Aachen, FRG 2 III. Physikalisches Institut, R WTH, W-5100 Aachen, FRG 2 b National Institute for High Energy Physics, NIKHEF, NL-1009 DB Amsterdam, The Netherlands c University of Michigan, Ann Arbor, MI 48109, USA d Laboratoire d'Annecy-le-Vieux de Physique des Particules, LAPP,1N2P3-CNRS, B.P. 110, F-74941 Annecy-le-Vieux Cedex, France e Johns Hopkins University, Baltimore, MD 21218, USA f Institute of High Energy Physics, IHEP, 100039 Beijing, China g INFN-Sezione di Bologna, L40126 Bologna, Italy h Tata Institute of Fundamental Research, Bombay 400 005, India i Boston University, Boston, MA 02215, USA J Northeastern University, Boston, MA 02115, USA k Central Research Institute for Physics of the Hungarian Academy of Sciences, H-1525 Budapest 114, Hungary 3 e Harvard University, Cambridge, MA 02139, USA m Massachusetts Institute of Technology, Cambridge, MA 02139, USA n INFN Sezione di Firenze and University of Florence, 1-50125 Florence, Italy o European Laboratory for Particle Physics, CERN, CH-1211 Geneva 23, Switzerland p World Laboratory, FBLJA Project, CH-1211 Geneva 23, Switzerland q University of Geneva, CH-1211 Geneva 4, Switzerland r Chinese University of Science and Technology, USTC, HefeL Anhui 230 029, China s University of Lausanne, CH-IO15 Lausanne, Switzerland t Lawrence Livermore National Laboratory, Livermore, CA 94550, USA u Los Alamos National Laboratory, Los Alamos, NM 87544, USA v Institut de Physique Nuclbaire de Lyon, IN2P3-CNRS, Universitb Claude Bernard, F-69622 Villeurbanne Cedex, France w Centro de Investigaciones Energeticas, Medioambientales y Tecnologicas, CIEMAT, E-28040 Madrid, Spain x INFN-Sezione di Milano, 1-20133 Milan, Italy Y Institute of Theoretical and Experimental Physics, ITEP, Moscow, Russian Federation z INFN-Sezione di Napoli and University of Naples, 1-80125 Naples, Italy aa Department of Natural Sciences, University of Cyprus, Nicosia, Cyprus ab University of Nymegen and NIKHEF, NL-6525 El) Nymegen, The Netherlands ac Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA ad California Institute of Technology, Pasadena, CA 91125, USA ae INFN-Sezione di Pen4gia and Universit~ Degli Studi di Perugia, 1-06100 Perugia, Italy af Carnegie Mellon University, Pittsburgh, PA 15213, USA ag Princeton University, Princeton, NJ 08544, USA ah INFN-Sezione di Roma and University of Rome, "'La Sapienza" 1-00185 Rome, Italy ai Nuclear Physics Institute, St. Petersburg, Russian Federation aj University of California, San Diego, CA 92093, USA ak Dept. de Fisica de Particulas Elementales, Univ. de Santiago, E-15 706 Santiago de Compostela, Spain at Shanghai Institute of Ceramics, SIC, ShanghaL China am Bulgarian Academy of Sciences, Institute of Mechatronics, BU-1113 Sofia, Bulgaria an Center for High Energy Physics, Korea Advanced Institute of Sciences and Technology, 305-701 Taejon, Republic of Korea ao University of Alabama, Tuscaloosa, AL 35486, USA ap Purdue University, West Lafayette, IN 47907, USA aq Paul Scherrer Institut, PSI, CH-5232 Villigen, Switzerland ar DESY-Institut j~r Hochenergiephysik, 0-1615 Zeuthen, FRG as EidgeniJssische Technische Hochschule, ETH Ziirich, CH-8093 Ziirich, Switzerland at University of Hamburg, W-2000 Hamburg, FRG au High Energy Physics Group, Taiwan, China