The partial decay width of the Z to b (b) over bar quark pairs has been measured by the DELPHI detector at LEP. b-hadrons, containing b-quarks, were tagged by leptons with high transverse momentum relative to the hadron or by tracks with large impact parameters to the primary vertex. The ratio of the numbers of events with a single such tag to those with two tags was used to estimate the efficiency of the method and to reduce the systematic uncertainty.
Measurement of Gamma(b(b)over-bar)/Gamma(had) using impact parameter measurements and lepton identification
CACCIA, MASSIMO;PREST, MICHELA;
1995-01-01
Abstract
The partial decay width of the Z to b (b) over bar quark pairs has been measured by the DELPHI detector at LEP. b-hadrons, containing b-quarks, were tagged by leptons with high transverse momentum relative to the hadron or by tracks with large impact parameters to the primary vertex. The ratio of the numbers of events with a single such tag to those with two tags was used to estimate the efficiency of the method and to reduce the systematic uncertainty.
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