Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Proton-Proton Near-Forward Hard Elastic Scattering   We calculate the leading twist contribution to near-forward proton-proton
(and proton-antiproton) elastic scattering with large momentum transfer, in the
multiple scattering (Landshoff) mechanism. The amplitude in the near-forward
region is dominated by singlet exchange for all three valence quark-quark
scatterings. We assume the existence of a hard singlet quark-quark amplitude,
which we estimate to be ${\cal O}(\alpha_s^2/t)$. For a three-quark state whose
transverse size is less than $1/\Lambda_{\rm QCD}$, Sudakov resummation
accounts for both approximate $\d \sigma^{pp}/ \d t \sim t^{-8}$ at moderate
$t$, and $\d \sigma^{pp}/ \d t \sim t^{-10}$ at larger $t$. The transition from
approximate $t^{-8}$ to $t^{-10}$ behavior is strongly correlated with the
transverse size of the valence three-quark state in the proton.

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The categories of this paper are: quant-ph
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The categories of this paper are: patt-sol
36
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: bayes-an
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The categories of this paper are: supr-con
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The categories of this paper are: stat
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The categories of this paper are: dg-ga
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The categories of this paper are: acc-phys
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The categories of this paper are: nucl-th
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The categories of this paper are: hep-th
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The categories of this paper are: nucl-ex
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The categories of this paper are: chao-dyn
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The categories of this paper are: cond-mat
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The categories of this paper are: physics
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The categories of this paper are: cs