Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The ratio of sigma_L/sigma_T in DIS at low x   Assuming helicity independence for q-qbar scattering in the color-dipole
picture, or, equivalently proportionality of sea quark and gluon distributions,
we find R(W^2,Q^2) = 0.5 (approximately) at large Q^2, where R(W^2,Q^2) denotes
the ratio of the longitudinal and transverse photoabsorption cross sections.
The forthcoming direct measurements of R(W^2,Q^2) allow one to test the
underlying hypotheses.

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The categories of this paper are: hep-ex
26
The categories of this paper are: bayes-an
7
The categories of this paper are: hep-th
20
The categories of this paper are: acc-phys
25
The categories of this paper are: patt-sol
32
The categories of this paper are: atom-ph
15
The categories of this paper are: nucl-ex
6
The categories of this paper are: astro-ph
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The categories of this paper are: q-fin
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The categories of this paper are: ao-sci
35
The categories of this paper are: mtrl-th
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The categories of this paper are: quant-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: plasm-ph
12
The categories of this paper are: nucl-th
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The categories of this paper are: q-bio