Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: QCD Sum Rules for Masses of Excited Heavy Mesons   The masses of excited heavy mesons are studied with sum rules in the heavy
quark effective theory. A set of interpolating currents creating (annihilating)
excited heavy mesons with arbitrary spin and parity are proposed and their
properties are discussed. Numerical results at the leading order of the {\cal
O}(1/m_Q) expansion are obtained for the lowest doublets (0^+, 1^+) and (1^+,
2^+).

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The categories of this paper are: math
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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: atom-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: chem-ph
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The categories of this paper are: cs
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The categories of this paper are: nucl-ex
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The categories of this paper are: supr-con
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The categories of this paper are: solv-int
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The categories of this paper are: q-fin
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The categories of this paper are: funct-an
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The categories of this paper are: ao-sci
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-lat
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The categories of this paper are: q-bio