Abstract
The decays B0 d, B0 s → e+e-, μ+μ-, e±μ∓ are searched for in 3.5 million hadronic Z events, which constitute the full LEP I data sample collected by the L3 detector. No signals are observed, therefore upper limits at the 90% (95%) confidence levels are set on the following branching fractions: Br(B0 d → e+e-) < 1.4(1.8) × 10-5; Br(B0 s → e+e-) < 5.4(7.0) × 10-5; Br(B0 d → μ+μ-) < 1.0(1.4) × 10-5; Br(B0 s → μ+μ-) < 3.8(5.1) × 10-5; Br(B0 d → e±μ∓) < 1.6(2.0) × 10-5; Br(B0 s → e±μ∓) < 4.1(5.3) × 10-5. The results for B0 s → e+e- and B0 s → e±μ∓are the first limits set on these decay modes.
| Original language | English |
|---|---|
| Pages (from-to) | 474-480 |
| Number of pages | 7 |
| Journal | Physics Letters B |
| Volume | 391 |
| Issue number | 3-4 |
| DOIs | |
| State | Published - Jan 16 1997 |
Funding
’ I. Physikalisches Institut, RWTH, D-52056 Aachen, FRG 1 III. Physikalisches Institut, RWTH, D-52056 Aachen, FRG ’ ’ National Institute for High Energy Physics, NIKHEE and University of Amsterdam, NL-1009 DB Amsterdam, The Netherlands c University of Michigan, Ann Arbor; MI 48109, USA ’ Laboratoire d’Annecy-le-Vteux de Physique des Particules, LAPPIN2P3-CNRS, BP 110, F-74941 Annecy-le-Vieux CEDEX, France e Johns Hopkins University, Baltimore, MD 21218, USA f Institute of Physics, University of Basel, CH-4056 Basel, Switzerland E Institute of High Energy Physics, IHEP, 100039 Beijing, China6 h Humboldt University D-10099 Berlin, FRG I i INFN-Sezione di Bologna, I-40126 Bologna, Italy j Tata Institute of Fundamental Research, Bombay 400 005, India k Boston University, Boston, MA 02215, USA ’ Northeastern University, Boston, MA 02115, USA m Institute of Atomic Physics and University of Bucharest, R-76900 Bucharest, Romania ” Central Research Institute for Physics of the Hungarian Academy of Sciences, H-I525 Budapest 114, Hungary2 Q Harvard University, Cambridge, MA 02139, USA Q Massachusetts Institute of Technology, Cambridge, MA 02139, USA 4 INFN Sezione di Firenze and University of Florence, I-50125 Florence, Italy t European Laboratory for Particle Physics, CERN, CH-121 I Geneva 23, Switzerland s World Laboratory, FBLJA Project, CH-1211 Geneva 23, Switzerland ’ University of Geneva, CH-IZII Geneva 4, Switzerland u Chinese University of Science and Technology, USTC, Hefei, Anhui 230 029, China 6 v SEFI: Research Institute for High Energy Physics, PO. Box 9, SF-00014 Helsinki, Finland w University of Iausanne, CH-IO15 Iausanne, Switzerland ’ INFN-Sezione di Lecce and Universita Degli Studi di Lecce, I-73100 Lecce, Italy Y Los Alamos National Laboratory, Los Alamos, NM 87544, USA ’ Institut de Physique Nucleaire de Lyon, IN2P3-CNRSUniversite’ Claude Bernard, F-69622 Villeurbanne, France aa Centro de Investigaciones Energeticas, Medioambientales y Tecnologicas, CIEMAT, E-28040 Madrid, Spain3 ab INFN-Sezione di Milano, I-20133 Milan, Italy ac Institute of Theoretical and Experimental Physics, ITEP, Moscow, Russia ad INFN-Sezione di Napoli and University of Naples, I-8OI25 Naples, Italy ae Department of Natural Sciences, University of Cyprus, Nicosia, Cyprus af University of Nymegen and NIKHEF NL-6525 ED Nymegen, The Netherlands ‘8 Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA ah California Institute of Technology, Pasadena, CA 91125, USA ai INFN-Sezione di Perugia and Universitd Degli Studi di Perugia, I-06100 Perugia, Italy =j Carnegie Mellon University Pittsburgh, PA 15213, USA 3k Princeton University Princeton, NJ 08544, USA ae INFN-Sezione di Roma and University of Rome, “La Sapienza”, I-00185 Rome, Italy am Nuclear Physics Institute, St. Petersburg, Russia ‘Q University and INFN, Salerno, I-84100 Salerno, Italy i10 University of California, San Diego, CA 92093, USA aQD ept. de Fisica de Particulas Elementales, Univ. de Santiago, E-15706 Santiago de Compostela, Spain aq Bulgarian Academy of Sciences, Central Laboratory of Mechatronics and Instrumentation, BU-III3 Sofia, Bulgaria a= Center for High Energy Physics, Korea Advanced Inst. of Sciences and Technology, 305-701 Taejon, South Korea as University of Alabama, Tuscaloosa, AL 35486, USA Bt Vtrecht University and NIKHEF NL-3584 CB Utrecht, The Netherlands au Purdue University, West Lafayette, IN 47907, USA av Paul Scherrer Institut, PSI, CH-5232 Villigen, Switzerland ZwD ESY-Institut fiir Hochenergiephysik, D-15738 Zeuthen, FRG ay Eidgeniissische Technische Hochschule, ETH Ziirich, CH-8093 Ziirich, Switzerland