Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: $B \to J/\psi K$ Decays in QCD Factorization   The hadronic decays $B\to J/\psi K(K^*)$ are interesting because
experimentally they are the only color-suppressed modes which have been
measured, and theoretically they are calculable by QCD factorization even the
emitted meson $J\psi$ is heavy. We analyze the decay $B\to J\psi K$ within the
framework of QCD factorization in the heavy quark limit. We show explicitly the
scale and $\gamma_5$-scheme independence of decay amplitudes and infrared
safety of nonfactorizable corrections at twist-2 order. Leading-twist
contributions from the light-cone distribution amplitudes (LCDAs) of the mesons
are too small to accommodate the data; the nonfactorizable corrections to naive
factorization are small and not significant. We study the twist-3 effects due
to the kaon and find that the coefficient $a_2(J\psi K)$ is largely enhanced by
the nonfactorizable spectator interactions arising from the twist-3 kaon LCDA
$\phi^K_\sigma$, which are formally power-suppressed but chirally,
logarithmically and kinematically enhanced. Therefore, factorization breaks
down at twist-3 order. Higher-twist effects of $J\psi$ are briefly discussed.
Our result also resolves the long-standing sign ambiguity of $a_2(J\psi K)$,
which turns out to be positive for its real part.

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The categories of this paper are: nlin
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The categories of this paper are: cmp-lg
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The categories of this paper are: stat
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The categories of this paper are: math-ph
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The categories of this paper are: gr-qc
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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: solv-int
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The categories of this paper are: funct-an
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The categories of this paper are: dg-ga
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The categories of this paper are: q-bio
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The categories of this paper are: hep-ex
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The categories of this paper are: patt-sol
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The categories of this paper are: comp-gas
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The categories of this paper are: physics
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The categories of this paper are: chem-ph