Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The effect of off-diagonal parton distributions in diffractive vector
  meson electroproduction   We present a simple physical description of the off-diagonal gluon
distribution g (x,x^\prime,Q^2) and splitting function P_{gg}(x,x^\prime) which
enter the amplitude for diffractive vector meson production. We study the
off-diagonal effects both on the evolution in Q^2 and on the input
distribution. We predict the ratio $R$ of the off-diagonal to the diagonal
gluon density, x^\prime g(x,x^\prime,Q^2)/xg(x, Q^2), as a function of the
kinematic variables.

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The categories of this paper are: alg-geom
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The categories of this paper are: physics
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The categories of this paper are: bayes-an
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The categories of this paper are: math
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The categories of this paper are: q-fin
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The categories of this paper are: chem-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: dg-ga
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The categories of this paper are: quant-ph
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The categories of this paper are: hep-ex
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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
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The categories of this paper are: cond-mat
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The categories of this paper are: solv-int
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The categories of this paper are: acc-phys