Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Dynamical Retardation Corrections to the Mass Spectrum of Heavy
  Quarkonia   A new version for the relativistic generalization of the wide class of static
quark--antiquark confining potentials is suggested. The comparison of this
approach with other ones, known in literature, is considered. With the use of
Logunov--Tavkhelidze quasipotential approach the first--order retardation
corrections to the heavy quarkonia mass spectrum are calculated. As expected,
these corrections turn out to be small for all low--lying heavy meson states.

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The categories of this paper are: atom-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: q-fin
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The categories of this paper are: ao-sci
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The categories of this paper are: adap-org
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The categories of this paper are: acc-phys
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The categories of this paper are: nucl-ex
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The categories of this paper are: hep-ex
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The categories of this paper are: chao-dyn
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The categories of this paper are: patt-sol
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The categories of this paper are: bayes-an
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The categories of this paper are: chem-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: q-bio
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The categories of this paper are: cmp-lg
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The categories of this paper are: plasm-ph