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ae • av ae ak a~ A classifier based on a feed-forward neural network has been used for separating a sample of about 123 500 selected hadronic decays of the Z °, collected by DELPHI during 1991, into three classes according to the flavour of the original quark pair: ug + dd + sg (unresolved), cE and bb. The classification has been used to compute the partial(More)
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