Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Two-photon exchange in electron-trinucleon elastic scattering   We discuss two-photon exchange (TPE) in elastic electron scattering off the
trinucleon systems, 3He and 3H. The calculations are done in the
semirelativistic approximation with the trinucleon wave functions obtained with
the Paris and CD-Bonn nucleon-nucleon potentials. An applicability area of the
model is wide enough and includes the main part of kinematical domain where
experimental data exist. All three TPE amplitudes (generalized form factors)
for electron 3He elastic scattering are calculated. We find that the TPE
amplitudes are few times more significant in the scattring of electrons off 3He
then in the electron proton scattering.

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The categories of this paper are: supr-con
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The categories of this paper are: comp-gas
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The categories of this paper are: mtrl-th
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The categories of this paper are: econ
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The categories of this paper are: alg-geom
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The categories of this paper are: bayes-an
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The categories of this paper are: eess
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The categories of this paper are: gr-qc
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The categories of this paper are: q-bio
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The categories of this paper are: quant-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: stat
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The categories of this paper are: chao-dyn
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The categories of this paper are: adap-org
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The categories of this paper are: q-alg
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The categories of this paper are: hep-ex