Abstract
We report on a study of energetic, isolated photons in a sample of ∼ 320 000 Z0 hadronic decays. Energetic isolated photons probe the short-distance structure of QCD. We compare our data with the prediction of several QCD-based calculations. A search for new processes with one or two photons in the hadronic final state is also presented. No evidence for physics beyond the standard model is found.
| Original language | English |
|---|---|
| Pages (from-to) | 472-484 |
| Number of pages | 13 |
| Journal | Physics Letters B |
| Volume | 292 |
| Issue number | 3-4 |
| DOIs | |
| State | Published - Oct 15 1992 |
Funding
o Institute of Theoretical and Experimental Physics, ITEP, 117 259 Moscow, Russian Federation P University of Michigan, Ann Arbor, MI 48109, USA q Tata Institute of Fundamental Research, Bombay 400 005, India r L Physikalisches Institut, RWTH, W-5100 Aachen, FRG 2 and IlL Physikalisches Institut, RWTH, 141-5100 Aachen, FRG 2 s INFN - Sezione di Roma and Universiti~ di Roma "'La Sapienza", 1-00185 Rome, Italy t Princeton University, Princeton, NJ 08544, USA u University of Alabama, Tuscaloosa, AL 35486, USA v University of Geneva, CH-1211 Geneva 4, Switzerland w Laboratoire de Physique des Particules, LAPP, F-74941 Annecy-le-Vieux, France x Central Research Institute for Physics of the Hungarian Academy of Sciences, 1-1-1525 Budapest 114, Hungary Y National Institute for High Energy Physics, NIKHEF, NL-IO09 DB Amsterdam, The Netherlands z University of Nijmegen and NIKHEF, NL-6525 ED Nijmegen, The Netherlands aa University of California, San Diego, CA 92182, USA ab Carnegie Mellon University, Pittsburgh, PA 15213, USA aeL os Alamos National Laboratory, Los Alamos, NM 87544, USA ad Institut de Physique Nuclbaire de Lyon, IN2P3-CNRS/Universitb Claude Bernard, F-69622 Villeurbanne Cedex, France ae Purdue University, West Lafayette, IN 47907, USA af Lawrence Livermore National Laboratory, Livermore, CA 94550, USA as High Energy Physics Group, Taiwan, ROC ah Institute of High Energy Physics, IHEP, Beijing, China ai Chinese University of Science and Technology, USTC, Hefei, Anhui 230 029, China aj Oak Ridge National Laboratory, Oak Ridge, TN 37830, USA ak Departamento de Fisica de Particulas Elementales, Universidad de Santiago, E-15706 Santiago de Compostela, Spain at Paul Scherrer Institut, PSI, CH-5232 Villigen, Switzerland amS hanghai Institute of Ceramics, SIC, ShanghaL China an DESY-Institut J~r Hochenergiephysik, 0-1615 Zeuthen, FRG ao University of Lausanne, CH-1015 Lausanne, Switzerland ap California Institute of Technology, Pasadena, CA 91125, USA aq Harvard University, Cambridge, MA 02139, USA ar Department of Natural Sciences, University of Cyprus, Nicosia, Cyprus as University of Hamburg, W-2000 Hamburg, FRG a INFN - Sezione di Firenze and Universith di Firenze, 1-50125 Florence, Italy b Centro de Investigaciones Energeticas, Medioambientales y Tecnologicas, CIEMAT, E-28040 Madrid, Spain c Boston University, Boston, MA 02215, USA d Johns Hopkins University, Baltimore, MD 21218, USA e European Laboratory for Particle Physics, CERN, CH-1211 Geneva 23, Switzerland f INFN-Sezione di Napoli and Universitit di Napoli, 1-80125 Naples, Italy g Northeastern University, Boston, MA 02115, USA h INFN - Sezione di Perugia and Universitit Degli Studi di Perugia, 1-06100 Perugia, Italy i World Laboratory, FBLJA Project, CH-1211 Geneva 23, Switzerland J EidgenOssische Technische Hochschule, ETH Ziirich, CH-8093 Zurich, Switzerland k Massachusetts Institute of Technology, Cambridge, MA 02139, USA e Nuclear Physics Institute, St. Petersburg, Russian Federation m Bulgarian Academy of Sciences, Institute ofMechatronics, BU-1113 Sofia, Bulgaria n INFN - Sezione di Bologna, 1-40126 Bologna, Italy