Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Search for the Flavor-Changing Neutral Current Decay D^0\to\mu^+\mu^- in
  p\bar{p} Collisions at \sqrt{s}=1.96 TeV   We report on a search for the flavor-changing neutral current decay
D^0\to\mu^+\mu^- in p\bar{p} collisions at \sqrt{s}=1.96 TeV using 65\ipb of
data collected by the CDF II experiment at the Fermilab Tevatron Collider. A
displaced-track trigger selects long-lived D^0 candidates in the
D^0\to\mu^+\mu^- search channel, the kinematically similar D^0\to\pi^+\pi^-
channel used for normalization, the Cabbibo-favored D^0\to K^+\pi^- channel
used to optimize the selection criteria in an unbiased manner, and their charge
conjugates. Finding no signal events in the D^0\to\mu^+\mu^- search window, we
set an upper limit on the branching fraction {\cal B}(D^0\to\mu^+\mu^-)\leq
2.5E-6 (3.3E-6) at the 90% (95%) confidence level.

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The categories of this paper are: cmp-lg
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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: dg-ga
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The categories of this paper are: alg-geom
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The categories of this paper are: acc-phys
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The categories of this paper are: chao-dyn
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The categories of this paper are: hep-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: cond-mat
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The categories of this paper are: comp-gas
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The categories of this paper are: astro-ph
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The categories of this paper are: q-bio
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The categories of this paper are: nlin
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The categories of this paper are: quant-ph
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The categories of this paper are: q-alg