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Classification of the hadronic decays of the Z0 into B and C quark pairs using a neural network

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Classification of the hadronic decays of the Z0 into B and C quark pairs using a neural network

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DELPHI Collaboration; Allen, Paul; Castillo Giménez, María Victoria; Chrin, J. T. M.; Cortina Gil, Eduardo; Fez Laso, M. D. M. de; Ferrer Soria, Antonio; Fuster Verdú, Juan A.; García García, Carmen; Gómez Cadenas, Juan José; Hernández Rey, Juan José; Higón Rodríguez, Emilio; Lozano Bahilo, José Julio; Lacasta Llácer, Carlos; Martí García, Salvador; Salt Cairols, José; Valls Ferrer, Juan Antonio; Zúñiga Román, Juan

Aquest document és un/a article, creat/da en: 1992

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 0 , collected by DELPHI during 1991, into three classes according to the flavour of the original quark pair: u u +d d +s s (unresolved), c c and b b . The classification has been used to compute the partial widths of the Z 0 into b and c quark pairs. This gave Γ c c /Γ h = 0.151 ± 0.008 ( stat. ) ± 0.041 ( syst. ) , Γ b b /Γ h = 0.232±0.005 ( stat. )±0.017 ( syst. ) .

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