Measurement of the b quark forward-backward asymmetry around the Z0 peak using an inclusive tag

Details Measurement of the b quark forward-backward asymmetry around the Z0 peak using an inclusive tag Measurement of the b quark forward-backward asymmetry around the Z0 peak using an inclusive tag

2002-09-27

arxiv.org/abs/hep-ex/0209076v1

Phys.Lett.B546:29-47,2002

Physics

High Energy Physics

High Energy Physics - Experiment

23 pages, 5 figures

Scientific paper

10.1016/S0370-2693(02)02594-7

The b quark forward-backward asymmetry has been measured using hadronic Z0 decays collected by the OPAL experiment at LEP. Z0 -> bbbar 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: A^b_FB = 0.0582 +- 0.0153 +- 0.0012 at sqrt(s) = 89.50 GeV A^b_FB = 0.0977 +- 0.0036 +- 0.0018 at sqrt(s) = 91.26 GeV A^b_FB = 0.1221 +- 0.0123 +- 0.0025 at sqrt(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 sin2theta_W^eff,e = 0.23205 +- 0.00068.

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