Abstract

The b quark forward-backward asymmetry has been measured using hadronic Z0 decays collected by the OPAL experiment at LEP. Z0 → bb̄ decays were selected using a combination of secondary vertex and lepton tags, and the sign of the b quark charge was determined using an inclusive tag based on jet, vertex and kaon charges. The results, corrected to the quark level, are: AFB b= 0.0582 ± 0.0153 ± 0.0012 at √s = 89.50 GeV, AFB b= 0.0977 ± 0.0036 ± 0.0018 at √s = 91.26 GeV, AFB b= 0.1221 ± 0.0123 ± 0.0025 at √s = 92.91 GeV, where the first error is statistical and the second systematic in each case. Within the framework of the Standard Model, the result is interpreted as a measurement of the effective weak mixing angle for electrons of sin2θw eff,e = 0.23205 ± 0.00068.

Original languageEnglish
Pages (from-to)29-47
Number of pages19
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume546
Issue number1-2
DOIs
StatePublished - 17 Oct 2002

Funding

FundersFunder number
German Israeli Bi-national Science Foundation
Hungarian Foundation for Scientific ResearchOTKA T-029328, T-038240
National Science Foundation
U.S. Department of Energy
Natural Sciences and Engineering Research Council of Canada
National Research Council Canada
Japan Society for the Promotion of Science
Ministry of Education, Culture, Sports, Science and Technology
Bundesministerium für Bildung und Forschung
Fonds Wetenschappelijk Onderzoek
Israel Academy of Sciences and Humanities
Israel Science Foundation

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