Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Modified parton distributions and the HERA high-Q^2 anomaly   A recent proposal seeks to explain the anomaly in the HERA high-Q^2 neutral
current e^+p data by modifying the parton distribution functions at
moderate-to-high-x and large Q^2. We investigate the consequences of this
proposal for the HERA high-Q^2 data itself, in the neutral current e^-p channel
and especially in the charged current e^\pm p channels. We find that there are
striking signatures in the charged current which already serve to rule out many
possibilities, including the (symmetric) intrinsic charm hypothesis. For those
not ruled out, interesting signals are predicted in e^-p scattering.

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The categories of this paper are: mtrl-th
2
The categories of this paper are: math
36
The categories of this paper are: cmp-lg
25
The categories of this paper are: patt-sol
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The categories of this paper are: ao-sci
29
The categories of this paper are: funct-an
5
The categories of this paper are: gr-qc
28
The categories of this paper are: alg-geom
7
The categories of this paper are: hep-th
22
The categories of this paper are: chao-dyn
15
The categories of this paper are: nucl-ex
10
The categories of this paper are: q-bio
3
The categories of this paper are: physics
21
The categories of this paper are: adap-org
14
The categories of this paper are: math-ph
17
The categories of this paper are: q-fin