Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurement of the Branching Fractions of the Decays $\bar{B}^{0} \to
  \Lambda_{c}^{+} \bar{p}$ and $B^{-} \to \Lambda_{c}^{+} \bar{p} \pi^{-}$   We present studies of two-body and three-body charmed baryonic B decays in a
sample of 232 million $B\bar{B}$ pairs collected with the BABAR detector at the
PEP-II $e^+e^-$ storage ring. The branching fractions of the decays
$\bar{B}^{0} \to \Lambda_{c}^{+} \bar{p}$ and $B^{-} \to \Lambda_{c}^{+}
\bar{p} \pi^{-}$ are measured to be $(2.15 \pm 0.36 \pm 0.13 \pm 0.56) \times
10^{-5}$ and $(3.53 \pm 0.18 \pm 0.31 \pm 0.92)\times10^{-4}$, respectively.
The uncertainties quoted are statistical, systematic, and from the
$\Lambda_{c}^{+} \to p K^- \pi^+$ branching fraction. We observe a
baryon-antibaryon threshold enhancement in the $\Lambda_{c}^{+} \bar{p}$
invariant mass spectrum of the three-body mode and measure the ratio of the
branching fractions to be ${\cal B}(B^{-} \to \Lambda_{c}^{+} \bar{p}
\pi^{-})/{\cal B}(\bar{B}^{0} \to \Lambda_{c}^{+} \bar{p}) = 16.4 \pm 2.9 \pm
1.4$. These results are preliminary.

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The categories of this paper are: hep-th
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The categories of this paper are: nucl-th
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The categories of this paper are: econ
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The categories of this paper are: patt-sol
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The categories of this paper are: cond-mat
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The categories of this paper are: nlin
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The categories of this paper are: q-fin
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The categories of this paper are: alg-geom
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The categories of this paper are: supr-con
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The categories of this paper are: physics
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The categories of this paper are: cmp-lg
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The categories of this paper are: ao-sci
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The categories of this paper are: funct-an
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The categories of this paper are: acc-phys
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The categories of this paper are: nucl-ex
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The categories of this paper are: math-ph