Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Partonic calculation of $\gamma Z$ Exchange Corrections to
  Parity-Violating Elastic Electron-Proton Scattering   We calculate $\gamma Z$ exchange corrections to the parity-violating
asymmetry of the elastic electron-proton scattering in a parton model using the
formalism of generalized parton distributions(GPDs). We also examine the
validity of the zero-momentum-transfer approximation adopted in the literatures
and find that it overestimates the $\gamma Z$ exchange effect significantly at
the forward scattering angles.

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The categories of this paper are: atom-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: chem-ph
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The categories of this paper are: physics
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-ex
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The categories of this paper are: math
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The categories of this paper are: q-alg
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The categories of this paper are: hep-th
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The categories of this paper are: nlin
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The categories of this paper are: q-bio
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The categories of this paper are: cmp-lg
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The categories of this paper are: ao-sci
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The categories of this paper are: patt-sol
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The categories of this paper are: math-ph
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The categories of this paper are: acc-phys