Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurement of the polarization observables I^s and I^c in the reaction
  \gamma p -> p \pi^0 \pi^0 with the CBELSA/TAPS experiment   To unambiguously identify baryon resonances the measurement of polarization
observables is of great importance. With the CBELSA/TAPS experiment, located at
the ELSA accelerator facility in Bonn, polarization observables have been
determined. Using a linearly polarized photon beam impinging on a liquid
hydrogen target, the polarization observables I^s and I^c for the reaction
\gamma p -> p \pi^0 \pi^0 have been determined for the first time.

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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: econ
0
The categories of this paper are: hep-ph
4
The categories of this paper are: cond-mat
36
The categories of this paper are: cmp-lg
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The categories of this paper are: solv-int
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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: dg-ga
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The categories of this paper are: cs
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The categories of this paper are: astro-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: stat
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The categories of this paper are: math-ph
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The categories of this paper are: quant-ph