Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Search for a Very Light CP-Odd Higgs Boson in Top Quark Decays from
  p-anti-p Collisions at 1.96 TeV   We present the results of a search for a very light CP-odd Higgs boson
$a_1^0$ originating from top quark decays t -> H^+ b -> W^+ a_1^0 b, and
subsequently decaying into tau-tau. Using a data sample corresponding to an
integrated luminosity of 2.7 inv fb collected by the CDF II detector in
p-anti-p collisions at 1.96 TeV, we perform a search for events containing a
lepton, three or more jets, and an additional isolated track with transverse
momentum in the range 3 to 20 GeV/c. Observed events are consistent with
background sources, and 95% C.L. limits are set on the branching ratio of t ->
H^+ b for various masses of H^+ and a_1^0.

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The categories of this paper are: hep-th
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The categories of this paper are: supr-con
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The categories of this paper are: math
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The categories of this paper are: cond-mat
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The categories of this paper are: nucl-ex
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The categories of this paper are: funct-an
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The categories of this paper are: cs
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The categories of this paper are: nlin
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The categories of this paper are: adap-org
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The categories of this paper are: q-fin
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The categories of this paper are: dg-ga
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The categories of this paper are: stat
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The categories of this paper are: hep-lat
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The categories of this paper are: math-ph
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The categories of this paper are: solv-int
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The categories of this paper are: q-bio