Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Search for the Decay B0 -> pi0 pi0   We present a search for the decay B^0 --> pi^0 pi^0 by the BABAR experiment
at the PEP-II asymmetric-energy B-factory at SLAC. Using approximately 88
million B bar{B} pairs collected between 1999 and 2002, we place a 90%
confidence level upper limit on the branching fraction of B(B^0 --> pi^0 pi^0)
< 3.6 times 10^{-6}. This result is preliminary.

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The categories of this paper are: chao-dyn
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The categories of this paper are: astro-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: nucl-th
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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: eess
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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: hep-lat
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The categories of this paper are: acc-phys
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The categories of this paper are: gr-qc
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The categories of this paper are: solv-int
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The categories of this paper are: math-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: math