Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the origin of the rise of $F_2$ at small $x$   We show that, provided that the non-perturbative input is regular at the
right of the $\omega=0$ singularity of the dominant DGLAP anomalous dimension,
the rise of $F_2$ at small $x,$ experimentally measured by the averaged
observable $\lambda = <(\partial ln F_2)/(\partial ln 1/x)>,$ is
input-independent in the perturbative $Q^2$ regime at small $x$. $(\partial ln
xF)/(\partial ln Q^2)$ appears to be more input-dependent in the same range.
The GRV-type parametrisations verify these properties. Other models, namely the
BFKL kernel(QCD dipoles), DGLAP(hard pomeron singularity) give different
predictions for $\lambda$. At moderate $Q^2,$ there is a possibility of
distinguishing these different perturbative QCD predictions in the near future.

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The categories of this paper are: econ
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The categories of this paper are: chao-dyn
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The categories of this paper are: quant-ph
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The categories of this paper are: adap-org
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The categories of this paper are: hep-th
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The categories of this paper are: math-ph
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The categories of this paper are: eess
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The categories of this paper are: q-bio
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The categories of this paper are: ao-sci
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The categories of this paper are: alg-geom
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The categories of this paper are: math
3
The categories of this paper are: physics
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The categories of this paper are: stat
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The categories of this paper are: nucl-ex
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The categories of this paper are: cmp-lg
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The categories of this paper are: supr-con