Abstract
A search for ℓ+ℓ- qq̄ (ℓ = e, μ) four-fermion final states in high multiplicity events has been performed at √s ≈ mz and above the Z peak at √s = 130 GeV and √s = 136 GeV. The data taken with OPAL correspond to an integrated luminosity of 132.4 pb-1 and 5.3 pb-1 at √s ≈ mz and √s = 130-136 GeV, respectively. While at the Z resonance the data are in good agreement with the Standard Model predictions, we find more events than expected at √s - 130-136 GeV, especially in the μ+μ- qq̄ channel, where 5 events remain after all cuts, with only 0.6 predicted by the Monte Carlo simulation. For all center-of-mass energies the observed shapes of the differential distributions are consistent with the predictions.
Original language | English |
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Pages (from-to) | 315-328 |
Number of pages | 14 |
Journal | Physics Letters B |
Volume | 376 |
Issue number | 4 |
DOIs | |
State | Published - May 30 1996 |
Externally published | Yes |
Funding
It is a pleasure to thank the SL Division for the efficient operation of the LEP accelerator,t he precise information on the absolute energy,a nd their continuing close cooperation with 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 ResearchC ouncil, Canada, Israel Ministry of Science, Israel Science Foundation, administeredb y the Israel Academy of Science and Humanities, Minerva Gesellschaft, Japanese Ministry of Education, Science and Culture (the Monbusho) and a grant under the Monbusho International Science ResearchP rogram, German Israeli Bi-national Science Foundation (GIF) t Direction des Sciencesd e la Mat&e du Commissariat ?I 1’Energie Atomique, France, Bundesministerium fiir Bildung, Wissenschaft, Forschung und Technologie, Germany, National ResearchC ouncil of Canada, Hungarian Foundation for Scientific Research,O TKA T-016660, and OTKA F-015089.
Funders | Funder number |
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German Israeli Bi-national Science Foundation (GIF) t Direction des Sciencesd e la Mat&e du Commissariat ? | |
Israel Ministry of Science, Israel Science Foundation | |
Minerva Gesellschaft | |
Monbusho International Science ResearchP rogram | |
Natural Sciences and Engineering ResearchC ouncil | |
Ministry of Education, Culture, Sports, Science and Technology | |
Israel Academy of Sciences and Humanities |