Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Determination of the analysing power for the $\vec{p}p \rightarrow
  pp\eta$ reaction using WASA-at-COSY detector system   We report on the measurement of the analyzing power for the (vec)pp->ppeta
reaction with beam momenta of 2026 MeV/c and 2188 MeV/c performed with the
WASA-at-COSY detector at the Cooler Synchrotron COSY. The eta meson from the
(vec)pp-> ppeta reaction was identified by the techniques of missing mass and
invariant mass. The angular distribution of the determined analyzing power
strongly disagree with theoretical predictions. A comparison of the obtained Ay
angular distribution with a series of associated Legendre polynomials revealed
negligible contribution of the Sd partial wave at Q = 15 MeV. However, at Q =
72 MeV, a significant interference of the Ps and Pp partial waves was observed.

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The categories of this paper are: math-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: plasm-ph
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The categories of this paper are: q-fin
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The categories of this paper are: stat
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The categories of this paper are: quant-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: econ
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The categories of this paper are: alg-geom
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The categories of this paper are: chao-dyn
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The categories of this paper are: solv-int
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The categories of this paper are: patt-sol
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The categories of this paper are: physics
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The categories of this paper are: astro-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: q-alg