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Measurement of the forward-backward asymmetry ine +e − → b band the b-quark branching ratio to muons at TRISTAN using neural networks

Authors
Journal
Physics Letters B
0370-2693
Publisher
Elsevier
Publication Date
Volume
381
Identifiers
DOI: 10.1016/0370-2693(96)00543-6
Keywords
  • Particles And Fields
Disciplines
  • Computer Science
  • Physics

Abstract

Abstract The forward-backward asymmetry in e +e − → b b at s = 57.9 GeV and the b-quark branching ratio to muons have been measured using neural networks. Unlike previous methods for measuring the b b forward-backward asymmetry where the estimated background from c-quark decays and other sources are subtracted, here events are categorized as either b b or non- b b events by neural networks based on event-by-event characteristics. The determined asymmetry is −0.429 ± 0.044 (stat) ± 0.047 (sys) and is consistent with the prediction of the standard model. The measured B B mixing parameter is 0.136 ± 0.037 (stat) ± 0.040 (sys) ± 0.002 (model) and the measured b-quark branching ratio to muons is 0.122 ± 0.006 (stat) ± 0.007 (sys).

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