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# Measurement of the partial decay width R$_{b}^{0}= \Gamma_{b\overline{b}}/\Gamma_{had}$ of the Z with the DELPHI detector at Lep

Abstract : The partial decay width of the Z to b\overline{ b} quark pairs has been measured by the DELPHI detector at LEP. B-hadrons, containing b-quarks, were tagged by several methods using tracks with large impact parameters to the primary vertex complemented sometimes by event shape variables or using leptons with high transverse momentum relative to the hadron. In order to reduce the systematic uncertainties, in all methods the b-tagging efficiency has been extracted directly from the data. Combining all methods, the value: $\frac{\Gamma_{b \bar{b}}}{\Gamma_{had}} = 0.2216 \pm 0.0016(stat.) \pm 0.0021 (syst.)$ was found, where the c\overline{c} production fraction was fixed to its Standard Model value.
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http://hal.in2p3.fr/in2p3-00003516
Contributor : Sylvie Flores <>
Submitted on : Tuesday, February 16, 1999 - 2:46:24 PM
Last modification on : Wednesday, March 31, 2021 - 10:50:02 PM
Long-term archiving on: : Friday, May 29, 2015 - 4:20:27 PM

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• HAL Id : in2p3-00003516, version 1

### Citation

P. Abreu, W. Adam, T. Adye, E. Agasi, I. Ajinenko, et al.. Measurement of the partial decay width R$_{b}^{0}= \Gamma_{b\overline{b}}/\Gamma_{had}$ of the Z with the DELPHI detector at Lep. Zeitschrift für Physik C Particles and Fields, Springer Verlag, 1996, 70, pp.531-547. ⟨in2p3-00003516⟩

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