Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Exclusive $\pi^+$ electroproduction off the proton from low to high -t   Background: Measurements of exclusive meson production are a useful tool in
the study of hadronic structure. In particular, one can discern the relevant
degrees of freedom at different distance scales through these studies. Purpose:
To study the transition between non-perturbative and perturbative Quantum
Chromodyanmics as the square of four momentum transfer to the struck proton,
-t, is increased. Method: Cross sections for the $^1$H(e,e'$\pi^+$)n reaction
were measured over the -t range of 0.272 to 2.127 GeV$^2$ with limited
azimuthal coverage at fixed beam energy of 4.709 GeV, Q$^2$ of 2.4 GeV$^2$ and
W of 2.0 GeV at the Thomas Jefferson National Accelerator Facility (JLab) Hall
C. Results: The -t dependence of the measured $\pi^+$ electroproduction cross
section generally agrees with prior data from JLab Halls B and C. The data are
consistent with a Regge amplitude based theoretical model, but show poor
agreement with a Generalized Parton Distribution (GPD) based model. Conclusion:
The agreement of cross sections with prior data implies small contribution from
the interference terms, and the confirmation of the change in t-slopes between
the low and high -t regions previously observed in photoproduction indicates
the changing nature of the electroproduction reaction in our kinematic regime.

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The categories of this paper are: cmp-lg
20
The categories of this paper are: acc-phys
12
The categories of this paper are: nucl-th
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The categories of this paper are: plasm-ph
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The categories of this paper are: supr-con
7
The categories of this paper are: hep-th
17
The categories of this paper are: q-fin
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The categories of this paper are: ao-sci
13
The categories of this paper are: quant-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: funct-an
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The categories of this paper are: nlin
5
The categories of this paper are: gr-qc
0
The categories of this paper are: hep-ph
27
The categories of this paper are: comp-gas
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The categories of this paper are: mtrl-th