Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Structure Functions F_2^c, F_L and F_L^c in the Framework of the k_T
  Factorization   We present the perturbative parts of the structure functions F_2^c and F_L^c
for a gluon target having nonzero transverse momentum squared at order \alpha
_s. The results of the double convolution (with respect to the Bjorken variable
x and the transverse momentum) of the perturbative part and the unintegrated
gluon densities are compared with HERA experimental data for F_2^c and F_L at
low x values and with predictions of other approaches. The contribution from
F_L^c structure function ranges 10\div30% of that of F_2^c at the HERA
kinematical range.

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The categories of this paper are: q-bio
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The categories of this paper are: stat
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The categories of this paper are: eess
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The categories of this paper are: cmp-lg
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The categories of this paper are: quant-ph
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The categories of this paper are: funct-an
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The categories of this paper are: supr-con
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The categories of this paper are: acc-phys
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The categories of this paper are: physics
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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: alg-geom
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The categories of this paper are: hep-lat
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The categories of this paper are: hep-th
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The categories of this paper are: econ
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The categories of this paper are: comp-gas