Abstract
An event sample enriched in semileptonic decays of b hadrons is selected using an inclusive lepton selection from approximately 3.0 million hadronic Z0 decays collected with the OPAL detector. This sample is used to investigate B meson oscillations by reconstructing a proper decay time for the parent of each lepton, using a jet charge method to estimate the production flavour of this parent, and using the lepton charge to tag the decay flavour. We measure the mass difference between the two Bd0 mass eigenstates Δmd = 0.444 ± 0.029 -0.017+0.020 ps-1 . For the Bs0 system, we find Δms > 3.1 ps-1 at the 95% confidence level. This limit varies only a little if alternative limit setting approaches are adopted. Regions at higher Δms values are also excluded with some methods for setting the limit. By studying the charge symmetry of the Bd0 mixing structure, we are able to constrain possible CP and CPT violating effects. We measure the CP violation parameter Re εB = -0.006 ± 0.010 ± 0.006 and the indirect CPT violating parameter Im δB = -0.020 ± 0.016 ± 0.006 . If we invoke CPT symmetry, then we obtain Re εB = 0.002 ± 0.007 ± 0.003.
| Original language | English |
|---|---|
| Pages (from-to) | 401-415 |
| Number of pages | 15 |
| Journal | Zeitschrift fur Physik C-Particles and Fields |
| Volume | 76 |
| Issue number | 3 |
| DOIs | |
| State | Published - Nov 1997 |
| Externally published | Yes |
Funding
Acknowledgements. We particularly wish to thank the SL Division for the efficient operation of the LEP accelerator and for their continuing close co-operation with our experimental group. We thank our colleagues from CEA, DAPNIA/SPP, CE-Saclay for their efforts over the years on the time-of-flight and trigger systems which we continue to use. 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 Science Foundation, administered by the Israel Academy of Science and Humanities, Minerva Gesellschaft, Benoziyo Center for High Energy Physics, Japanese Ministry of Education, Science and Culture (the Monbusho) and a grant under the Mon-busho 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, T023793 and OTKA F-023259.
| Funders | Funder number |
|---|---|
| Direction des Sciences de la Matière du Commissariat à l’Energie Atomique | |
| German Israeli Bi-national Science Foundation | |
| Hungarian Foundation for Scientific Research | OTKA T-016660, OTKA F-023259, T023793 |
| 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 | |
| Israel Science Foundation |