Abstract
A measurement of the charm and bottom forward-backward asymmetry in e+e- annihilations is presented at energies on and around the peak of the Z0 resonance. Decays of the Z0 into charm and bottom quarks are tagged using D mesons identified in about 4 million hadronic decays of the Z0 boson recorded with the OPAL detector at LEP between 1990 and 1995. Approximately 33000 D mesons are tagged in seven different decay modes. From these the charm and bottom asymmetries are measured in three energy ranges around the Z0 peak: AFB c =0.039 ± 0.051 ± 0.009 AFB c =0.063 ± 0.012 ± 0.006 AFB c =0.158 ± 0.041 ± 0.011 AFB b =-0.086 ± 0.108 ± 0.029 AFB b = 0.094 ± 0.027 ± 0.022 AFB b =-0.021 ± 0.090 ± 0.026 〈Ecm〉 =89.45 GeV 〈Ecm〉 =91.22 GeV 〈Ecm〉 =93.00 GeV The results are in agreement with the predictions of the standard model and other measurements at LEP.
Original language | English |
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Pages (from-to) | 379-395 |
Number of pages | 17 |
Journal | Zeitschrift fur Physik C-Particles and Fields |
Volume | 73 |
Issue number | 3 |
DOIs | |
State | Published - Feb 1997 |
Externally published | Yes |
Funding
Acknowledgements. We particularly wish to thank the SL Division for the efficient operation of the LEP accelerator, for the precise information on the absolute energy, and for their continuing close cooperation with our experimental group. In addition to the support staff at our own institutions we are pleased to acknowledge the Department of 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, administered by 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 Research Program, German Israeli Bi-national Science Foundation (GIF), Direction des Sciences de la Matière du Commissariat à l’Energie Atomique, France, Bundesministerium für Bildung, Wissenschaft, Forschung und Technologie, Germany, National Research Council of Canada, Hungarian Foundation for Scientific Research, OTKA T-016660, and OTKA F-015089.
Funders | Funder number |
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Direction des Sciences de la Matière du Commissariat à l’Energie Atomique | |
German Israeli Bi-national Science Foundation | |
Hungarian Foundation for Scientific Research | OTKA F-015089, OTKA T-016660 |
Israel Ministry of Science, Israel Science Foundation | |
Minerva Gesellschaft | |
National Science Foundation | |
U.S. Department of Energy | |
Natural Sciences and Engineering Research Council of Canada | |
National Research Council Canada | |
Ministry of Education, Culture, Sports, Science and Technology | |
Bundesministerium für Bildung und Forschung | |
Israel Academy of Sciences and Humanities |