Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: B-identification for Level 2: The Silicon Track Trigger at D0   This article describes the Silicon Track Trigger (STT) which has been fully
commissioned in 2004 at the DO experiment. The STT allows to enrich already at
the second trigger level the data sample with events containing B-mesons. The
STT achieves this by providing within about 50 microseconds tracks with an
impact parameter resolution of around 50 micrometer. The article shows
preliminary results of the trigger performance and presents a fast
b-identification algorithm for the second trigger level.

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The categories of this paper are: gr-qc
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The categories of this paper are: patt-sol
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The categories of this paper are: stat
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The categories of this paper are: hep-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: comp-gas
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The categories of this paper are: hep-th
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The categories of this paper are: dg-ga
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The categories of this paper are: acc-phys
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The categories of this paper are: cs
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The categories of this paper are: q-fin
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The categories of this paper are: nucl-th
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The categories of this paper are: math-ph
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The categories of this paper are: cond-mat
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The categories of this paper are: supr-con
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The categories of this paper are: nlin