Measurement of the probability for gluon splitting into b bbar in Z0 decays

Details Measurement of the probability for gluon splitting into b bbar in Z0 decays Measurement of the probability for gluon splitting into b bbar in Z0 decays

1999-08-06

arxiv.org/abs/hep-ex/9908028v1

Physics

High Energy Physics

High Energy Physics - Experiment

16 pages latex including 4 figures in eps format. Submitted to 1999 Lepton-Photon Symposium

Scientific paper

We present a preliminary measurement of the rate of gluon splitting into bottom quarks, g -> b bbar, in hadronic Z0 decays collected by SLD between 1996 and 1998. The analysis was performed by looking for secondary bottom production in 4-jet events of any primary flavour. 4-jet events were identified, and a topological vertex-mass technique was applied to each jet in order to identify b or bbar jets. The upgraded CCD based vertex detector gives very high B-tagging efficiency, especially for B hadrons of the low energies typical of this process. The two most nearly collinear b/bbar jets were tagged as originating from g -> b bbar. We measured the rate of secondary b/bbar production per hadronic event, g_bb, to be (3.07+-0.71(stat.)+-0.66(syst.)) * 10**-3.

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