Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: An Updated Study of B Meson Oscillations using Dilepton Events   This paper reports a study of B meson oscillations using hadronic Z^0 decays
with two identified leptons, and updates a previous publication by including
data collected in 1994. Decay times are reconstructed for each of the
semileptonic B decays by forming vertices which include the lepton and by
estimating the B meson momentum. The mass difference, Delta(m_d), between the
two mass eigenstates in the B^0_d system is measured to be
  0.430 +/- 0.043 + 0.028 - 0.030 ps^-1, where the first error is statistical
and the second error is systematic. For the B^0_s system, a lower limit of
Delta(m_s) > 2.2 ps^-1 is obtained at 95% C.L.

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The categories of this paper are: q-fin
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The categories of this paper are: patt-sol
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The categories of this paper are: bayes-an
22
The categories of this paper are: chao-dyn
5
The categories of this paper are: gr-qc
12
The categories of this paper are: nucl-th
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The categories of this paper are: supr-con
3
The categories of this paper are: physics
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The categories of this paper are: chem-ph
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The categories of this paper are: funct-an
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The categories of this paper are: hep-lat
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The categories of this paper are: atom-ph
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The categories of this paper are: plasm-ph
2
The categories of this paper are: math
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The categories of this paper are: eess
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The categories of this paper are: solv-int