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Measurement of the multiplicity of gluons splitting to bottom quark pairs in hadronic Z0 decays

par Abreu, Pedro;Bertrand, Daniel ;Vander Velde, Catherine ; [et al.]
Référence Physics letters. Section B, 405, page (202-214)
Publication Publié, 1997

Article révisé par les pairs

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Résumé :

An inclusive measurement of the average multiplicity of bb̄ pairs from gluons, gbb̄, 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 gbb̄ = (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.© 1997 Elsevier Science B.V.