Eur. Phys. J. C 10, 415-442
A precise measurement of the partial decay
The DELPHI Collaboration
P.Abreu21 - et al.
Received: 18 December 1998 / Revised version: 26 April 1999 / Published online: 3 August 1999
The partial decay width of the Z to 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
was obtained, where the production fraction was fixed to its Standard Model value.