Measurement of the Gamma (b anti-b) / Gamma (hadron) branching ratio of the Z by double hemisphere tagging

Abreu, P.;Cortina Gil, Eduardo;DELPHI Collaboration
(1995) Zeitschrift für Physik. C, Particles and fields — Vol. 65, n° 4, p. 555-568 (1995)

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Abstract
Two measurements of Γbbˉ/Γhad are presented. Both measurements use 250000Z decays taken with the DELPHI detector in 1991 and rely mainly on the precision of the microvertex detector. One tagging method is as simple as possible so that background rates can be reliably predicted by simulation. The other one uses a more involved tagging technique and reduces the dependence on simulation as much as possible. Combining both results, Γbbˉ/Γhad is found to be 0.2209±0.0041(stat.)±0.0042(syst.)±0.0018 Γccˉ .
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Abreu, P., Cortina Gil, E., & DELPHI Collaboration. (1995). Measurement of the Gamma (b anti-b) / Gamma (hadron) branching ratio of the Z by double hemisphere tagging. Zeitschrift für Physik. C, Particles and fields, 65(4), 555-568. https://doi.org/10.1007/BF01578666 (Original work published 1995)