Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurement of the B-->J/psi K^*(892) decay amplitudes   We present a measurement of the decay amplitudes in B-->J/psi K^*(892)
channels using 20.7 fb-1 of data collected at the Upsilon(4S) resonance with
the BABAR detector at PEP-II. We measure a P-wave fraction R_perp =
(16.0+/-3.2+/-1.4)% and a longitudinal polarization fraction
(59.7+/-2.8+/-2.4)%. The measurement of a relative phase that is neither 0 nor
pi, phi_ll = 2.50+/-0.20+/-0.08 radians, favors a departure from the
factorization hypothesis. Although the decay B-->J/psi Kpi proceeds mainly via
K^*(892), there is also evidence for K^*_2(1430) and Kpi S-wave contributions.

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The categories of this paper are: cs
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The categories of this paper are: nlin
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The categories of this paper are: hep-th
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The categories of this paper are: patt-sol
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The categories of this paper are: q-fin
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The categories of this paper are: econ
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The categories of this paper are: chao-dyn
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The categories of this paper are: q-alg
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The categories of this paper are: funct-an
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The categories of this paper are: plasm-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: eess
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The categories of this paper are: nucl-th
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The categories of this paper are: acc-phys
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The categories of this paper are: atom-ph
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The categories of this paper are: stat