Abstract
A study of twelve distinct decay channels of the ηc has been performed with the L3 detector at LEP, for an integrated luminosity of 30 pb-1. Summing all channels, 28 candidate events have been identified, with an estimated background of 11 events. The two-photon radiative width is evaluated to be Γγγ(ηc) = 8.0 ± 2.3 ± 2.4 keV.
| Original language | English |
|---|---|
| Pages (from-to) | 575-582 |
| Number of pages | 8 |
| Journal | Physics Letters B |
| Volume | 318 |
| Issue number | 3 |
| DOIs | |
| State | Published - Dec 9 1993 |
Funding
a L Physikalisches Institut, RWTH, W-5100 Aachen, FRG 1 and III. Physikalisches Institut, RWTH, W-5100 Aachen, FRG l b National Institute for High Energy Physics, NIKHEF, NL-IO09 DB Amsterdam, e University of Michigan, Ann Arbor, MI 48109, USA a Laboratoire d'Annecy-le-Vieux de Physique des Particules, LAPP, IN2P3-CNRS, BP 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, 1-40126 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 Institute of Atomic Physics and University of Bucharest, R-76900 Bucharest, Romania t Central Research Institute for Physics of the Hungarian Academy of Sciences, H-1525 Budapest 114, Hungary 2 ra Harvard University, Cambridge, MA 02139, USA n Massachusetts Institute of Technology, Cambridge, MA 02139, USA o INFN-Sezione di Firenze and University of Florence, 1-50125 Florence, Italy P European Laboratory for Particle Physics, CERN, CH-1211 Geneva 23, Switzerland q World Laboratory, FBLJA Project, CH-1211 Geneva 23, Switzerland r University of Geneva, CH-1211 Geneva 4, Switzerland s Chinese University of Science and Technology, USTC, Hefei, Anhui 230 029, China t University of Lausanne, CH-1015 Lausanne, Switzerland u Lawrence Livermore National Laboratory, Livermore, CA 94550, USA v Los Alamos National Laboratory, Los Alamos, NM 87544, USA w Institut de Physique Nucl~aire de Lyon, IN2P3-CNRS, Universitb Claude Bernard, F-69622 Villeurbanne Cedex, France x Centro de Investigaciones Energeticas, Medioambientales y Tecnologicas, CIEMA T, E-28040 Madrid, Spain Y INFN - Sezione di Milano, 1-20133 Milan, Italy z Institute of Theoretical and Experimental Physics, ITEP, Moscow, Russia aa INFN-Sezione di Napoli and University of Naples, 1-80125 Naples, Italy ab Department of Natural Sciences, University of Cyprus, Nicosia, Cyprus a¢ University of Nymegen and NIKHEF, NL-6525 ED Nymegen, The Netherlands ad Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA ae California Institute of Technology, Pasadena, CA 91125, USA af INFN-Sezione di Perugia and Universiti~ Degli Studi di Perugia, 1-06100 Perugia, Italy as Carnegie Mellon University, Pittsburgh, PA 15213, USA ah Princeton University, Princeton, NJ 08544, USA ai INFN-Sezione di Roma and University of Rome, "La Sapienza" 1-00185 Rome, Italy aj Nuclear Physics Institute, St. Petersburg, Russia ak University of California, San Diego, CA 92093, USA at Departamento de Fisica de Particulas Elementales, Universidad de Santiago, E-15706 Santiago de Compostela, Spain am Shanghai Institute of Ceramics, SIC, ShanghaL China Bulgarian Academy of Sciences, Institute of Mechatronics, BU-1113 Sofia, Bulgaria ao Center for High Energy Physics, Korea Advanced Institute of Sciences and Technology, 305-701 Taejon, South Korea ap University of Alabama, Tuscaloosa, AL 35486, USA aq Purdue University, West Lafayette, IN 47907, USA ar Paul Scherrer Institut, PSI, CH-5232 Villigen, Switzerland as DESY-Institut fiir Hochenergiephysik, 0-1615 Zeuthen, FRG at Eidgeni~ssische Technische Hochschule, ETH Ziirich, CH-8093 Ziirich, Switzerland au University of Hamburg, W-2000 Hamburg, FRG av High Energy Physics Group, Taiwar, ROC