Abstract
We have measured the branching fractions for the hadronic τ decays, τ → π Knπ° ν (0≤ n ≤3), with the L3 detector at LEP. Multiphoton final states are analyzed using the fine-grained, high-resolution electromagnetic calorimeter. The decay channels are identified using a neural network method. The results are: BR(τ → π Kν) = (11.82 ± 0.26 ± 0.43) %, BR(τ → π Kπ° ν) = (25.05 ± 0.35 ± 0.50)%, BR(τ → π K2π° ν) = (8.88 ± 0.37 ± 0.42)%, BR(τ → π K3πδ ν) = (1.70 ± 0.24 ± 0.38)%, where the first error quoted is statistical, the second systematic.
| Original language | English |
|---|---|
| Pages (from-to) | 93-102 |
| Number of pages | 10 |
| Journal | Physics Letters B |
| Volume | 345 |
| Issue number | 1 |
| DOIs | |
| State | Published - Feb 2 1995 |
Funding
a I. Physihalisches Institut, RWTH, D-52056 Aachen. FRG ’ III. Physihalisches Institut. RWTH, D-52056 Aachen, FRG ’ b National Institute for High Energy Physics, NIKHEE NL-1009 DB Amsterdam. The Netherlands ’ University of Michigan, Ann Arbor: MI 48109, USA e Laboratoire d’Annecy-le-Weux de Physique des Particules, LAPPIN2P3CNRS BP 110, F-74941 Annecy-le-l/ieux CEDEX, France e Johns Hopkins Vniversily. Baltimore, MD 21218, USA f Institute of High Energy Physics, IHEP 100039 Beijing, China z Humboldt University, D-10099 Berlin, FRG ’ INFN-Sezione di Bologna, l-40126 Bologna, Italy i Tata Institute of Fundamental Research, Bombay 400 005, India j Boston University, Boston, MA 02215, USA k Northeastern University, Boston, MA 02115, USA e Institute of Atomic Physics and University of Bucharest, R-76900 Bucharest, Romania m Central Research Institute for Physics of the Hungarian Academy of Sciences, H-1525 Budapest 114, Hungary2 Q Harvard University Cambridge, MA 02139, USA Q Massachusetts Institute of Technology, Cambridge, MA 02139, USA Q INFN Sezione di Firenze and University of Florence, l-50125 Florence, Italy 9 European Laboratory for Particle Physics, CERN, CH-1211 Geneva 23, Swikerland r World Laboratory, FBLJA Project, CH-1211 Geneva 23, Switzerland s University of Geneva, CH-1211 Geneva 4, Switzerland ’ Chinese University of Science and Technology, VSTC~ Hefei, Anhui 230 029, China u SEFT Research Institute for High Energy Physics, PO. Box 9, SF-00014 Helsinki, Finland ’ University of Lausanne, CH-1015 Lausanne, Switzerland w Los Alamos National Laboratory, Los Alamos. NM 87544, USA ’ Institut de Physique Nucleaire de Lyon, IN2P3CNRS,Vniversite Claude Bernard, F-69622 Weurbanne Cedex, France Y Centro de Investigaciones Energeticas, Medioambientales y Tecnologicas, CIEMAT E-28040 Madrid, Spain ’ INFN-Sezione di Milano, l-20133 Milan, Italy &1 Institute of Theoretical and Experimental Physics, ITEP, Moscow, Russia ab INFN-Sezione di Napoli and University of Naples, l-80125 Naples, Italy ac Department of Natural Sciences, University of Cyprus, Nicosia, Cyprus ad University of Nymegen and NIKHEE NL-6525 ED Nymegen. The Netherlands ae Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA aE Calvomia Institute of Technology, Pasadena, CA 91125, USA az INFN-Sezione di Perugia and Vniversitd Degli Studi di Perugia. I-06100 Perugia, Italy ah Carnegie Mellon University, Pittsburgh. PA 15213, USA ai Princeton University, Princeton, NJ 08544. USA aj INFN-Sezione di Roma and University of Rome, “La Sapienza”. l-00185 Rome, Italy ali Nuclear Physics Institute, St. Petersburg, Russia al University of California, San Diego? CA 92093, USA Bm Dept. de Fisica de Particulas Elementales, Univ. de Santiago, E-15706 Santiago de Compostela, Spain an Bulgarian Academy of Sciences, Institute of Mechatronics, BV-1113 Sofia, Bulgaria a0 Center for High Energy Physics. Korea Advanced Inst. of Sciences and Technology, 305701 Taejon. South Korea ap Universiry of Alabama, Tuscaloosa, AL 35486, USA q Purdue Univer& West Lafayette, IN 47907, USA BTP aul Schemer Institut, PSI, CH-5232 Wlligen. Switierland ils DESY-lnstitut fiIr Hochenergiephysik, D-15738 Zeuthen, FRG a’ Eidgeniissische Technische Hochschule, ETH Z&rich, CH-8093 Z&ich, Switzerland a’ University of Hamburg, 22761 Hamburg, FRG a’ High Energy Physics Group, Taiwan, ROC
| Funders | Funder number |
|---|---|
| Harvard University Cambridge | |
| Hungary2 | |
| INFN Sezione di Firenze | |
| INFN-Sezione | |
| University of Bucharest | |
| Massachusetts Institute of Technology | |
| Boston University | |
| Tata Institute of Fundamental Research | |
| Magyar Tudományos Akadémia | |
| Northeastern University | |
| Université de Genève | |
| Institute of High Energy Physics | |
| University of Chinese Academy of Sciences |