Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spin Effects in Diffractive $Q \bar Q$ Production and Compass Experiment   We calculate the double spin asymmetry of the diffractive $Q \bar Q$ and
vector meson leptoproduction at COMPASS energies. We analyze dependences of the
asymmetry on the structure of the Pomeron-proton coupling. It is shown that it
is difficult to study the spin structure of the Pomeron coupling with the
proton from the A_{ll} asymmetry. The A_{lT} asymmetry might be an appropriate
object for this investigation.

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The categories of this paper are: atom-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: econ
26
The categories of this paper are: bayes-an
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The categories of this paper are: math-ph
2
The categories of this paper are: math
1
The categories of this paper are: cs
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The categories of this paper are: chao-dyn
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The categories of this paper are: nlin
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The categories of this paper are: solv-int
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The categories of this paper are: chem-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: q-alg
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The categories of this paper are: supr-con
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The categories of this paper are: dg-ga
10
The categories of this paper are: q-bio