@article{19f06033d6b6476bb5adc2334e767e98,
title = "Prompt J/ψ production in hadronic Z0 decays",
abstract = "Evidence is presented for the production of prompt J/ψ mesons (not originating in b-hadron decays) in hadronic Z0 decays. Using a sample of 3.6 million hadronic events, 24 prompt J/ψ candidates are identified from their decays into e+e- and μ+μ- pairs. The background is estimated to be 10.2±2.0 events. The following branching ratio for prompt J/ψ production is obtained: Br(Z0 → prompt J/ψ + X) = (1.9 ± 0.7 ± 0.5 ± 0.5) · 10-4, where the first error is statistical, the second systematic and the third error accounts for uncertainties in the prompt J/ψ production mechanism.",
author = "{The OPAL Collaboration} and G. Alexander and J. Allison and N. Altekamp and K. Ametewee and Anderson, {K. J.} and S. Anderson and S. Arcelli and S. Asai and D. Axen and G. Azuelos and Ball, {A. H.} and E. Barberio and RJ Barlow and R. Bartoldus and Batley, {J. R.} and G. Beaudoin and J. Bechtluft and C. Beeston and T. Behnke and Bell, {A. N.} and Bell, {K. W.} and G. Bella and S. Bentvelsen and P. Berlich and S. Bethke and O. Biebel and V. Blobel and Bloodworth, {I. J.} and Bloomer, {J. E.} and P. Bock and Bosch, {H. M.} and M. Boutemeur and Bouwens, {B. T.} and S. Braibant and Brown, {R. M.} and Burckhart, {H. J.} and C. Burgard and R. B{\"u}rgin and P. Capiluppi and Carnegie, {R. K.} and Carter, {A. A.} and Carter, {J. R.} and Chang, {C. Y.} and C. Charlesworth and Charlton, {D. G.} and D. Chrisman and Chu, {S. L.} and Clarke, {P. E.L.} and I. Cohen and R. Folman",
note = "Funding Information: We would like to thank P. Cho for useful discussions. We also wish to thank the SL Division for the excellent start-up and performanceo f the LEP accel-eratori n the datat aking and for their continuing close cooperationw ith our experimentalg roup. In addition to the support staff at our own institutions we are pleasedt o acknowledget he Departmento f Energy, USA, National Science Foundation, USA, Particle Physics and Astronomy Research Council, UK Natural Sciences and Engineering Research Council, Canada, Israel Ministry of Science, Israel Science Foundation, administeredb y the Israel Academy of Science and Humanities, Minerva Gesellschaft, JapaneseM inistry of Education, Science and Culture (the Monbusho) and a grant under the Monbusho International Science ResearchP rogram, German Israeli Bi-national Science Foundation (GF), Direction des Sciencesd e la Matiere du Commissariat a 1{\textquoteright}Energie Atomique, France, Bundesministerium fur Bildung, Wissenschaft, Forschung und Technologie, Germany, National Research Council of Canada, Hungarian Foundation for Scientific Research,O TKA T-016660, and OTKA F-015089.",
year = "1996",
month = sep,
day = "19",
doi = "10.1016/0370-2693(96)00656-9",
language = "English",
volume = "384",
pages = "343--352",
journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",
issn = "0370-2693",
publisher = "Elsevier",
number = "1-4",
}