Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: NRQCD Factorization for Twist-2 Light-Cone Wave-Functions of Charmonia   We show that the twist-2 light-cone wave-functions of eta_c and J/\psi can be
factorized with nonrelativistic QCD(NRQCD) at one-loop level, where the
nonperturbative effects are represented by NRQCD matrix elements. The
factorization is achieved by expanding the small velocity v, which the c- or
\bar c- quark moves inside a rest quarkonium with. At leading order of v the
twist-2 light-cone wave-functions of eta_c and J/\psi can be factorized as the
product of a perturbative function and a NRQCD matrix element. The perturbative
function is calculated at one-loop level and free from any soft divergence. Our
results can be used for the production of J/\psi\eta_c through e^+e^-
-annihilation and of a charmonium in B-decays, which are studied in experiment
of two B-factories.

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The categories of this paper are: chem-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: mtrl-th
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The categories of this paper are: funct-an
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The categories of this paper are: atom-ph
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The categories of this paper are: eess
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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: comp-gas
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The categories of this paper are: astro-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: physics
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The categories of this paper are: supr-con
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The categories of this paper are: dg-ga
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-th