Abstract
Inclusive J production in Z0 decays is observed via the leptonic decay mode J → ℓ+ℓ- (ℓ = e,μ). We measure the branching ratio Br(Z0 → J + X) = (4.1 ± 0.7 (stat.) ± 0.3 (sys.)) × 10-3. We have calculated the fraction of the J mesons from b-hadron decay and find a branching ratio of Br(b → J + X)= (1.3±0.2(stat.)±0.2(sys.)) × 10-2. We determine the average fractional energy of bottom hadrons 〈XE > = 0.70±0.03 (stat.)+0.02 -0.01 (sys.) using the momentum spectrum of the J mesons. From a study of the angle between the J and the most energetic jet, we set an upper limit on the branching ratio Br(Z0 → qqg*;g* → J + X) < 7.0 × 10-4at 90% confidence level.
| Original language | English |
|---|---|
| Pages (from-to) | 412-420 |
| Number of pages | 9 |
| Journal | Physics Letters B |
| Volume | 288 |
| Issue number | 3-4 |
| DOIs | |
| State | Published - Aug 27 1992 |
| Externally published | Yes |
Funding
a INFN - Sezione di Firenze and Universit~ di Firenze, 1-50125 Florence, Italy b Centro de lnvestigaciones Energeticas, Medioambientales y Tecnologicas, CIEMAT, E-28040 Madrid, Spain c Boston University, Boston, MA 02215, USA d Johns Hopkins University, Baltimore, MD 21218, USA ¢ European Laboratory for Particle Physics, CERN, CH-1211 Geneva 23, Switzerland f 1NFN-Sezione di Napoli and Universit~t di Napoli, 1-80125 Naples, Italy g Northeastern University, Boston, MA 02115, USA h INFN-Sezione di Perugia and Universit& Degli Studi di Perugia, 1-06100 Perugia, Italy i World Laboratory, FBLJA Project, CH-1211 Geneva 23, Switzerland J Eidgen6ssische Technische Hochschule, ETH Zfirich, CH-8093 Zurich, Switzerland k Massachusetts Institute of Technology, Cambridge, MA 02139, USA t Nuclear Physics Institute, St. Petersburg, Russian Federation m Bulgarian Academy of Sciences, Institute ofMechatronics, BU~llI3 Sofia, Bulgaria n INFN - Sezione di Bologna, 1-40126 Bologna, Italy 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, R WTH, W-5100 Aachen, FRG 2 and III. Physikalisches Institut, RWTH, W-5100 Aachen, FRG 2 t INFN - Sezione di Roma and Universith di Roma "La Sapienza", 1-00185 Rome, Italy u Princeton University, Princeton, NJ 08544, USA v University of Alabama, Tuscaloosa, AL 35486, USA w University of Geneva, CH-1211 Geneva 4, Switzerland x Laboratoire de Physique des Particules, LAPP, F-74941 Annecy-le-Vieux, France Y Central Research Institute for Physics of the Hungarian Academy of Sciences, 1-1-1525 Budapest 114, Hungary z National Institute for High Energy Physics, NIKHEF, NL-IO09 DB Amsterdam, The Netherlands aa Univgrsity of Nijmegen and NIKHEF, NL-6525 ED Nijmegen, The Netherlands ab University of California, San Diego, CA 92182, USA ac Carnegie Mellon University, Pittsburgh, PA 15213, USA ad Los Alamos National Laboratory, Los Alamos, NM 87544, USA ae Institut de Physique Nuclbaire de Lyon, IN2P3-CNRS/Universitb Claude Bernard, F-69622 Villeurbanne Cedex, France af Purdue University, West Lafayette, IN 47907, USA ag Lawrence Livermore National Laboratory, Livermore, CA 94550, USA ah High Energy Physics Group, Taiwan, ROC ai Institute of High Energy Physics, IHEP, Beijing, China aj Chinese University of Science and Technology, USTC, HefeL Anhui 230 029, China ak Oak Ridge National Laboratory, Oak Ridge, TN 37830, USA al Paul Scherrer Institut, PSI, CH-5232 Villigen, Switzerland am Shanghai Institute of Ceramics, SIC, Shanghai, China an DESY-Institut fur 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
| Funders | Funder number |
|---|---|
| Centro de lnvestigaciones Energeticas, Medioambientales y Tecnologicas | |
| DESY-Institut | |
| INFN - Sezione di Bologna | |
| INFN-Sezione | |
| Institut de Physique Nuclbaire de Lyon | |
| Institute ofMechatronics | |
| NIKHEF | |
| Nuclear Physics Institute | |
| Russian Federation P University of Michigan | |
| St. Petersburg | |
| University of Hamburg | |
| University of Lausanne | |
| ah High Energy Physics Group | |
| Lawrence Livermore National Laboratory | |
| Oak Ridge National Laboratory | |
| Purdue University | |
| Princeton University | |
| Massachusetts Institute of Technology | |
| California Institute of Technology | |
| Boston University | |
| Harvard University | |
| Johns Hopkins University | |
| University of California, San Diego | |
| Carnegie Mellon University | |
| Los Alamos National Laboratory | |
| Russian Academy of Medical Sciences | |
| University of Cyprus | |
| Institute of Infection and Immunity | |
| Tata Institute of Fundamental Research | |
| Eidgenössische Technische Hochschule Zürich | |
| Magyar Tudományos Akadémia | |
| Instituto Nazionale di Fisica Nucleare | |
| Northeastern University | |
| Paul Scherrer Institut | |
| Università degli Studi di Firenze | |
| Université de Genève | |
| University of Science and Technology of China | |
| Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas | |
| Institute of High Energy Physics | |
| Shanghai Institute of Ceramics of the Chinese Academy of Sciences | |
| University of Chinese Academy of Sciences |