Measurement of Ab_FB using inclusive b-hadron decays

Details Measurement of Ab_FB using inclusive b-hadron decays Measurement of Ab_FB using inclusive b-hadron decays

2001-07-11

arxiv.org/abs/hep-ex/0107033v1

Eur.Phys.J.C22:201-215,2001

Physics

High Energy Physics

High Energy Physics - Experiment

25 pages, 7 figures

Scientific paper

10.1007/s100520100812

Based on a sample of four million events collected by ALEPH from 1991 to 1995, a measurement of the forward-backward asymmetry in Z -> b-barb decays using inclusive final states is presented. High-performance tagging of b-barb events in a wide angular range is achieved using neural network techniques. An optimal hemisphere charge estimator is built by merging primary and secondary vertex information, leading kaon identification and jet charge in a neural network. The average charge asymmetry, the flavour tagging efficiencies and mean b-hemisphere charges are measured from data and used to extract the pole b asymmetry in the Standard Model A^{0,b}_{FB} = 0.1009 +- 0.0027 (stat) +- 0.0015 (syst), corresponding to a value of the effective weak mixing angle of sin^2(theta_W^{eff}) = 0.23193 +- 0.00056.

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