Based on a sample of four million events collected by ALEPH from 1991 to 1995, a measurement of the forward-backward asymmetry in decays using inclusive final states is presented. High-performance tagging of 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
Measurement of A(FB)**b using inclusive b hadron decays / A. Heister et al.; V.Ciulli; E.Focardi. - In: THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6044. - ELETTRONICO. - 22:(2001), pp. 201-215. [10.1007/s100520100812]
Measurement of A(FB)**b using inclusive b hadron decays
CIULLI, VITALIANO;FOCARDI, ETTORE
2001
Abstract
Based on a sample of four million events collected by ALEPH from 1991 to 1995, a measurement of the forward-backward asymmetry in decays using inclusive final states is presented. High-performance tagging of 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
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