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

Research output: Contribution to journalJournal article


Journal publication date11/2001
JournalEuropean Physical Journal C: Particles and Fields
Number of pages15
Original languageEnglish


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
corresponding to a value of the effective weak mixing angle of