Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Electroweak single-pion production off the nucleon: from threshold to
  high invariant masses   [Background] Neutrino-induced single-pion production (SPP) provides an
important contribution to neutrino-nucleus interactions, ranging from
intermediate to high energies. There exists a good number of low-energy models
in the literature to describe the neutrinoproduction of pions in the region
around the Delta resonance. Those models consider only lowest-order interaction
terms and, therefore, fail in the high-energy region (pion-nucleon invariant
masses, $W$>2 GeV).
  [Purpose] Our goal is to develop a model for electroweak SPP off the nucleon,
which is applicable to the entire energy range of interest for present and
future neutrino-oscillation experiments.
  [Method] We start with the low-energy model of [Phys.Rev.D76,033005(2007)],
which includes resonant contributions and background terms derived from the
pion-nucleon Lagrangian of chiral-perturbation theory. Then, from the
background contributions, we build a high-energy model using a Regge approach.
The low- and high-energy models are combined, in a phenomenological way, into a
hybrid model.
  [Results] The Hybrid model is identical to the low-energy model in the low-W
region, but, for W>2 GeV, it implements the desired high-energy behavior
dictated by Regge theory. We have tested the high-energy model by comparing
with one-pion production data from electron and neutrino reactions. The Hybrid
model is compared with electron-proton scattering data, with neutrino SPP data
and with the predictions of the NuWro Monte Carlo event generator.
  [Conclusions] Our model is able to provide satisfactory predictions of the
electroweak one-pion production cross section from pion threshold to high $W$.
Further investigation and more data are needed to better understand the
mechanisms playing a role in the electroweak SPP process in the high-W region,
in particular, those involving the axial current contributions.

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The categories of this paper are: hep-th
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The categories of this paper are: bayes-an
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The categories of this paper are: cs
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The categories of this paper are: eess
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The categories of this paper are: math-ph
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The categories of this paper are: funct-an
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The categories of this paper are: solv-int
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The categories of this paper are: econ
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The categories of this paper are: acc-phys
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The categories of this paper are: astro-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: nlin
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The categories of this paper are: chem-ph
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The categories of this paper are: q-alg
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The categories of this paper are: alg-geom
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The categories of this paper are: patt-sol