A Measurement of Rb using a Double Tagging Method
| dc.creator | The OPAL Collaboration | |
| dc.creator | al, G. Abbiendi et | |
| dc.date | 1998-10-01 | |
| dc.date.accessioned | 2026-07-07T12:02:26Z | |
| dc.date.available | 2026-07-07T12:02:26Z | |
| dc.description | The fraction of Z to bbbar events in hadronic Z decays has been measured by the OPAL experiment using the data collected at LEP between 1992 and 1995. The Z to bbbar decays were tagged using displaced secondary vertices, and high momentum electrons and muons. Systematic uncertainties were reduced by measuring the b-tagging efficiency using a double tagging technique. Efficiency correlations between opposite hemispheres of an event are small, and are well understood through comparisons between real and simulated data samples. A value of Rb = 0.2178 +- 0.0011 +- 0.0013 was obtained, where the first error is statistical and the second systematic. The uncertainty on Rc, the fraction of Z to ccbar events in hadronic Z decays, is not included in the errors. The dependence on Rc is Delta(Rb)/Rb = -0.056*Delta(Rc)/Rc where Delta(Rc) is the deviation of Rc from the value 0.172 predicted by the Standard Model. The result for Rb agrees with the value of 0.2155 +- 0.0003 predicted by the Standard Model. | |
| dc.description | 42 pages, LaTeX, 14 eps figures included, submitted to European Physical Journal C | |
| dc.identifier | https://arxiv.org/abs/hep-ex/9810002 | |
| dc.identifier | http://arxiv.org/abs/hep-ex/9810002 | |
| dc.identifier | Eur.Phys.J.C8:217-239,1999 | |
| dc.identifier | doi:10.1007/s100529901087 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/207437 | |
| dc.subject | High Energy Physics - Experiment | |
| dc.title | A Measurement of Rb using a Double Tagging Method | |
| dc.type | text |