Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Weak Quasielastic Production of Hyperons and Threshold Production of Two
  Pions   We have studied quasielastic charged current hyperon production induced by
$\bar\nu_\mu$ on free nucleon and the nucleons bound inside the nucleus and the
results are presented for several nuclear targets like $^{40}Ar$, $^{56}Fe$ and
$^{208}Pb$. The hyperon-nucleon transition form factors are determined from
neutrino-nucleon scattering and semileptonic decays of neutron and hyperons
using SU(3) symmetry. The nuclear medium effects(NME) due to Fermi motion and
final state interaction(FSI) effect due to hyperon-nucleon scattering have been
taken into account. Also we have studied two pion production at threshold
induced by neutrinos off nucleon targets. The contribution of nucleon, pion,
and contact terms are calculated using Lagrangian given by nonlinear $\sigma$
model. The contribution of the Roper resonance has also been taken into
account. The numerical results for the cross sections are presented and
compared with the experimental results from ANL and BNL.

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The categories of this paper are: cmp-lg
9
The categories of this paper are: nlin
2
The categories of this paper are: math
1
The categories of this paper are: cs
23
The categories of this paper are: solv-int
21
The categories of this paper are: adap-org
22
The categories of this paper are: chao-dyn
3
The categories of this paper are: physics
18
The categories of this paper are: econ
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The categories of this paper are: mtrl-th
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The categories of this paper are: plasm-ph
20
The categories of this paper are: acc-phys
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The categories of this paper are: eess
16
The categories of this paper are: stat
5
The categories of this paper are: gr-qc
8
The categories of this paper are: hep-ex