Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Measurement of Rb using a Vertex Mass Tag   We report a new measurement of Rb = Gamma(Z0->b-bbar) / Gamma(Z0->hadrons)
using a double tag technique, where the b hemisphere selection is based on the
reconstructed mass of the B hadron decay vertex. The measurement was performed
using a sample of 130k hadronic Z0 events, collected with the SLD at the SLC.
The method utilizes the 3-D vertexing abilities of the CCD pixel vertex
detector and the small stable SLC beams to obtain a high b-tagging efficiency
and purity. We obtain Rb=0.2142+/-0.0034(stat.)+/-0.0015(syst.)+/-0.0002(R_c).

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The categories of this paper are: q-alg
12
The categories of this paper are: nucl-th
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The categories of this paper are: alg-geom
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The categories of this paper are: solv-int
5
The categories of this paper are: gr-qc
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The categories of this paper are: dg-ga
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The categories of this paper are: econ
16
The categories of this paper are: stat
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The categories of this paper are: cmp-lg
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The categories of this paper are: hep-lat
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The categories of this paper are: chem-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: math-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: eess
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The categories of this paper are: funct-an