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

Research output: Contribution to journalJournal article

Published
<mark>Journal publication date</mark>11/2001
<mark>Journal</mark>European Physical Journal C: Particles and Fields
Issue number2
Volume22
Number of pages15
Pages (from-to)201-215
<mark>State</mark>Published
<mark>Original language</mark>English

Abstract

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.