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Measurement of the multiplicity of gluons splitting to bottom quark in hadronic Z° decays

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Measurement of the multiplicity of gluons splitting to bottom quark in hadronic Z° decays

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DELPHI Collaboration; Alemany Fernández, Reyes; Cabrera Urbán, Susana; Castillo Giménez, María Victoria; Cortina Gil, Eduardo; Ferrer Soria, Antonio; Fuster Verdú, Juan A.; García García, Carmen; Hernández Rey, Juan José; Higón Rodríguez, Emilio; Lacasta Llácer, Carlos; Martínez Vidal, Fernando; Navas Concha, Sergio; Salt Cairols, José

Aquest document és un/a article, creat/da en: 1997

Este documento está disponible también en : 10.1016/S0370-2693(97)00608-4

An inclusive measurement of the average multiplicity of bb pairs from gluons, gbb, in hadronic Z0 events collected by the DELPHI experiment at LEP, is presented. A counting technique, based on jet b-tagging in 4-jet events, has been used. Looking for secondary bottom production in events with production of any primary flavour, by requiring two b-tagged jets in well defined topological configurations, gave gbb = (0.21 +/- 0.11 (stat) +/- 0.09(syst)) %. This result was checked with a different method designed to select events with four b quarks in the final state. Agreement within the errors was found.

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