A Precise measurement of the partial decay width ratio R(b)**0 = Gamma(b anti-b)/Gamma(had)

Abreu, P.;Cortina Gil, Eduardo;DELPHI Collaboration;et.al.
(1999) European Physical Journal C. Particles and Fields — Vol. 10, n° 3, p. 415-442 (1999)

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Abstract
The partial decay width of the Z to bbˉ quark pairs has been measured by the DELPHI detector at LEP using data taken in the years 1992 to 1995. Decays of b-hadrons were tagged by several methods using tracks with large impact parameters and/or reconstructed secondary vertices, complemented by event shape variables. Combining these methods in a multivariate analysis the value Γ(Z→bbˉ)/Γ(Z→had)=0.21634±0.00067(stat)±0.00060(syst) was obtained, where the ccˉ production fraction was fixed to its Standard Model value.
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Abreu, P., Cortina Gil, E., DELPHI Collaboration, & et al. (1999). A Precise measurement of the partial decay width ratio R(b)**0 = Gamma(b anti-b)/Gamma(had). European Physical Journal C. Particles and Fields, 10(3), 415-442. https://doi.org/10.1007/s100520050766 (Original work published 1999)