Measurement of the branching ratios of the Z0 into heavy quarks

Details Measurement of the branching ratios of the Z0 into heavy quarks Measurement of the branching ratios of the Z0 into heavy quarks

2005-03-02

arxiv.org/abs/hep-ex/0503005v2

Phys.Rev.D71:112004,2005

Physics

High Energy Physics

High Energy Physics - Experiment

37 pages, 8 figures, to be submitted to Phys. Rev. D version 2: changed title to ratios, used common D production fractions fo

Scientific paper

10.1103/PhysRevD.71.112004

We measure the hadronic branching ratios of the Z0 boson into heavy quarks: Rb=Gamma(Z0->bb)/Gamma(Z0->hadrons) and Rc=Gamma(Z0->cc/Gamma(Z0->hadrons) using a multi-tag technique. The measurement was performed using about 400,000 hadronic Z0 events recorded in the SLD experiment at SLAC between 1996 and 1998. The small and stable SLC beam spot and the CCD-based vertex detector were used to reconstruct bottom and charm hadron decay vertices with high efficiency and purity, which enables us to measure most efficiencies from data. We obtain, Rb=0.21604 +- 0.00098(stat.) +- 0.00073(syst.) -+ 0.00012(Rc) and, Rc= 0.1744 +- 0.0031(stat.) +- 0.0020(syst.) -+ 0.0006(Rb)

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