Measurement of A**b(FB) using inclusive b hadron decays

ALEPH Collaboration, The and Heister, A. and Bouhova-Thacker, Evelina and Bowdery, Christopher and Finch, Alexander and Foster, Frank and Hughes, Gareth and Jones, Roger (2001) Measurement of A**b(FB) using inclusive b hadron decays. European Physical Journal C: Particles and Fields, 22 (2). pp. 201-215. ISSN 1434-6044

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Official URL: 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→bb¯ decays using inclusive final states is presented. High-performance tagging of bb¯ 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 A0,bFB=0.1011±0.0027(stat)±0.0012(syst), corresponding to a value of the effective weak mixing angle of sin2θeffW=0.23189±0.00056.

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Journal Article
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European Physical Journal C: Particles and Fields
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03 May 2013 10:58
Last Modified:
25 May 2024 23:52