Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Time Delay and Time Advance in Resonance Theory   We propose a theory of the resonance-antiresonance scattering process which
differs considerably from the classical one (the Breit-Wigner theory), which is
commonly used in the phenomenological analysis. Here both resonances and
antiresonances are described in terms of poles of the scattering amplitude: the
resonances by poles in the first quadrant while the antiresonances by poles in
the fourth quadrant of the complex angular momentum plane. The latter poles are
produced by non-local potentials, which derive from the Pauli exchange forces
acting among the nucleons or the quarks composing the colliding particles.

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The categories of this paper are: nucl-ex
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The categories of this paper are: solv-int
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The categories of this paper are: plasm-ph
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The categories of this paper are: econ
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The categories of this paper are: chem-ph
4
The categories of this paper are: cond-mat
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The categories of this paper are: acc-phys
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The categories of this paper are: q-fin
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The categories of this paper are: physics
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The categories of this paper are: funct-an
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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: hep-lat
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The categories of this paper are: stat
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The categories of this paper are: q-bio
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The categories of this paper are: q-alg